* [PATCH 1/4] target/arm: Move TCG-only VFP code into tcg/ subdir
2025-02-21 19:09 [PATCH 0/4] target/arm: Move vfp_helper.c TCG code into tcg/ subdir Peter Maydell
@ 2025-02-21 19:09 ` Peter Maydell
2025-02-21 19:09 ` [PATCH 2/4] target/arm: Move FPSCR get/set helpers to tcg/vfp_helper.c Peter Maydell
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: Peter Maydell @ 2025-02-21 19:09 UTC (permalink / raw)
To: qemu-arm, qemu-devel
Most of the target/arm/vfp_helper.c file is purely TCG helper code,
guarded by #ifdef CONFIG_TCG. Move this into a new file in
target/arm/tcg/.
This leaves only the code relating to getting and setting the
FPCR/FPSR/FPSCR in the original file. (Some of this also is
TCG-only, but that needs more careful disentangling.)
Having two vfp_helper.c files might seem a bit confusing,
but once we've finished moving all the helper code out
of the old file we are going to rename it to vfp_fpscr.c.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
The diff might look a little confusing; git has opted
to show it as "copy vfp_helper.c to tcg/vfp_helper.c;
remove moved code from old file; remove not-moved
code from new file".
---
target/arm/{ => tcg}/vfp_helper.c | 399 +----------
target/arm/vfp_helper.c | 1109 -----------------------------
target/arm/tcg/meson.build | 1 +
3 files changed, 4 insertions(+), 1505 deletions(-)
copy target/arm/{ => tcg}/vfp_helper.c (71%)
diff --git a/target/arm/vfp_helper.c b/target/arm/tcg/vfp_helper.c
similarity index 71%
copy from target/arm/vfp_helper.c
copy to target/arm/tcg/vfp_helper.c
index 5d424477a2d..aa580ff64c7 100644
--- a/target/arm/vfp_helper.c
+++ b/target/arm/tcg/vfp_helper.c
@@ -23,404 +23,13 @@
#include "internals.h"
#include "cpu-features.h"
#include "fpu/softfloat.h"
-#ifdef CONFIG_TCG
#include "qemu/log.h"
-#endif
-
-/* VFP support. We follow the convention used for VFP instructions:
- Single precision routines have a "s" suffix, double precision a
- "d" suffix. */
/*
- * Set the float_status behaviour to match the Arm defaults:
- * * tininess-before-rounding
- * * 2-input NaN propagation prefers SNaN over QNaN, and then
- * operand A over operand B (see FPProcessNaNs() pseudocode)
- * * 3-input NaN propagation prefers SNaN over QNaN, and then
- * operand C over A over B (see FPProcessNaNs3() pseudocode,
- * but note that for QEMU muladd is a * b + c, whereas for
- * the pseudocode function the arguments are in the order c, a, b.
- * * 0 * Inf + NaN returns the default NaN if the input NaN is quiet,
- * and the input NaN if it is signalling
- * * Default NaN has sign bit clear, msb frac bit set
+ * VFP support. We follow the convention used for VFP instructions:
+ * Single precision routines have a "s" suffix, double precision a
+ * "d" suffix.
*/
-void arm_set_default_fp_behaviours(float_status *s)
-{
- set_float_detect_tininess(float_tininess_before_rounding, s);
- set_float_ftz_detection(float_ftz_before_rounding, s);
- set_float_2nan_prop_rule(float_2nan_prop_s_ab, s);
- set_float_3nan_prop_rule(float_3nan_prop_s_cab, s);
- set_float_infzeronan_rule(float_infzeronan_dnan_if_qnan, s);
- set_float_default_nan_pattern(0b01000000, s);
-}
-
-/*
- * Set the float_status behaviour to match the FEAT_AFP
- * FPCR.AH=1 requirements:
- * * tininess-after-rounding
- * * 2-input NaN propagation prefers the first NaN
- * * 3-input NaN propagation prefers a over b over c
- * * 0 * Inf + NaN always returns the input NaN and doesn't
- * set Invalid for a QNaN
- * * default NaN has sign bit set, msb frac bit set
- */
-void arm_set_ah_fp_behaviours(float_status *s)
-{
- set_float_detect_tininess(float_tininess_after_rounding, s);
- set_float_ftz_detection(float_ftz_after_rounding, s);
- set_float_2nan_prop_rule(float_2nan_prop_ab, s);
- set_float_3nan_prop_rule(float_3nan_prop_abc, s);
- set_float_infzeronan_rule(float_infzeronan_dnan_never |
- float_infzeronan_suppress_invalid, s);
- set_float_default_nan_pattern(0b11000000, s);
-}
-
-#ifdef CONFIG_TCG
-
-/* Convert host exception flags to vfp form. */
-static inline uint32_t vfp_exceptbits_from_host(int host_bits, bool ah)
-{
- uint32_t target_bits = 0;
-
- if (host_bits & float_flag_invalid) {
- target_bits |= FPSR_IOC;
- }
- if (host_bits & float_flag_divbyzero) {
- target_bits |= FPSR_DZC;
- }
- if (host_bits & float_flag_overflow) {
- target_bits |= FPSR_OFC;
- }
- if (host_bits & (float_flag_underflow | float_flag_output_denormal_flushed)) {
- target_bits |= FPSR_UFC;
- }
- if (host_bits & float_flag_inexact) {
- target_bits |= FPSR_IXC;
- }
- if (host_bits & float_flag_input_denormal_flushed) {
- target_bits |= FPSR_IDC;
- }
- /*
- * With FPCR.AH, IDC is set when an input denormal is used,
- * and flushing an output denormal to zero sets both IXC and UFC.
- */
- if (ah && (host_bits & float_flag_input_denormal_used)) {
- target_bits |= FPSR_IDC;
- }
- if (ah && (host_bits & float_flag_output_denormal_flushed)) {
- target_bits |= FPSR_IXC;
- }
- return target_bits;
-}
-
-static uint32_t vfp_get_fpsr_from_host(CPUARMState *env)
-{
- uint32_t a32_flags = 0, a64_flags = 0;
-
- a32_flags |= get_float_exception_flags(&env->vfp.fp_status[FPST_A32]);
- a32_flags |= get_float_exception_flags(&env->vfp.fp_status[FPST_STD]);
- /* FZ16 does not generate an input denormal exception. */
- a32_flags |= (get_float_exception_flags(&env->vfp.fp_status[FPST_A32_F16])
- & ~float_flag_input_denormal_flushed);
- a32_flags |= (get_float_exception_flags(&env->vfp.fp_status[FPST_STD_F16])
- & ~float_flag_input_denormal_flushed);
-
- a64_flags |= get_float_exception_flags(&env->vfp.fp_status[FPST_A64]);
- a64_flags |= (get_float_exception_flags(&env->vfp.fp_status[FPST_A64_F16])
- & ~(float_flag_input_denormal_flushed | float_flag_input_denormal_used));
- /*
- * We do not merge in flags from FPST_AH or FPST_AH_F16, because
- * they are used for insns that must not set the cumulative exception bits.
- */
-
- /*
- * Flushing an input denormal *only* because FPCR.FIZ == 1 does
- * not set FPSR.IDC; if FPCR.FZ is also set then this takes
- * precedence and IDC is set (see the FPUnpackBase pseudocode).
- * So squash it unless (FPCR.AH == 0 && FPCR.FZ == 1).
- * We only do this for the a64 flags because FIZ has no effect
- * on AArch32 even if it is set.
- */
- if ((env->vfp.fpcr & (FPCR_FZ | FPCR_AH)) != FPCR_FZ) {
- a64_flags &= ~float_flag_input_denormal_flushed;
- }
- return vfp_exceptbits_from_host(a64_flags, env->vfp.fpcr & FPCR_AH) |
- vfp_exceptbits_from_host(a32_flags, false);
-}
-
-static void vfp_clear_float_status_exc_flags(CPUARMState *env)
-{
- /*
- * Clear out all the exception-flag information in the float_status
- * values. The caller should have arranged for env->vfp.fpsr to
- * be the architecturally up-to-date exception flag information first.
- */
- set_float_exception_flags(0, &env->vfp.fp_status[FPST_A32]);
- set_float_exception_flags(0, &env->vfp.fp_status[FPST_A64]);
- set_float_exception_flags(0, &env->vfp.fp_status[FPST_A32_F16]);
- set_float_exception_flags(0, &env->vfp.fp_status[FPST_A64_F16]);
- set_float_exception_flags(0, &env->vfp.fp_status[FPST_STD]);
- set_float_exception_flags(0, &env->vfp.fp_status[FPST_STD_F16]);
- set_float_exception_flags(0, &env->vfp.fp_status[FPST_AH]);
- set_float_exception_flags(0, &env->vfp.fp_status[FPST_AH_F16]);
-}
-
-static void vfp_sync_and_clear_float_status_exc_flags(CPUARMState *env)
-{
- /*
- * Synchronize any pending exception-flag information in the
- * float_status values into env->vfp.fpsr, and then clear out
- * the float_status data.
- */
- env->vfp.fpsr |= vfp_get_fpsr_from_host(env);
- vfp_clear_float_status_exc_flags(env);
-}
-
-static void vfp_set_fpcr_to_host(CPUARMState *env, uint32_t val, uint32_t mask)
-{
- uint64_t changed = env->vfp.fpcr;
-
- changed ^= val;
- changed &= mask;
- if (changed & (3 << 22)) {
- int i = (val >> 22) & 3;
- switch (i) {
- case FPROUNDING_TIEEVEN:
- i = float_round_nearest_even;
- break;
- case FPROUNDING_POSINF:
- i = float_round_up;
- break;
- case FPROUNDING_NEGINF:
- i = float_round_down;
- break;
- case FPROUNDING_ZERO:
- i = float_round_to_zero;
- break;
- }
- set_float_rounding_mode(i, &env->vfp.fp_status[FPST_A32]);
- set_float_rounding_mode(i, &env->vfp.fp_status[FPST_A64]);
- set_float_rounding_mode(i, &env->vfp.fp_status[FPST_A32_F16]);
- set_float_rounding_mode(i, &env->vfp.fp_status[FPST_A64_F16]);
- }
- if (changed & FPCR_FZ16) {
- bool ftz_enabled = val & FPCR_FZ16;
- set_flush_to_zero(ftz_enabled, &env->vfp.fp_status[FPST_A32_F16]);
- set_flush_to_zero(ftz_enabled, &env->vfp.fp_status[FPST_A64_F16]);
- set_flush_to_zero(ftz_enabled, &env->vfp.fp_status[FPST_STD_F16]);
- set_flush_to_zero(ftz_enabled, &env->vfp.fp_status[FPST_AH_F16]);
- set_flush_inputs_to_zero(ftz_enabled, &env->vfp.fp_status[FPST_A32_F16]);
- set_flush_inputs_to_zero(ftz_enabled, &env->vfp.fp_status[FPST_A64_F16]);
- set_flush_inputs_to_zero(ftz_enabled, &env->vfp.fp_status[FPST_STD_F16]);
- set_flush_inputs_to_zero(ftz_enabled, &env->vfp.fp_status[FPST_AH_F16]);
- }
- if (changed & FPCR_FZ) {
- bool ftz_enabled = val & FPCR_FZ;
- set_flush_to_zero(ftz_enabled, &env->vfp.fp_status[FPST_A32]);
- set_flush_to_zero(ftz_enabled, &env->vfp.fp_status[FPST_A64]);
- /* FIZ is A64 only so FZ always makes A32 code flush inputs to zero */
- set_flush_inputs_to_zero(ftz_enabled, &env->vfp.fp_status[FPST_A32]);
- }
- if (changed & (FPCR_FZ | FPCR_AH | FPCR_FIZ)) {
- /*
- * A64: Flush denormalized inputs to zero if FPCR.FIZ = 1, or
- * both FPCR.AH = 0 and FPCR.FZ = 1.
- */
- bool fitz_enabled = (val & FPCR_FIZ) ||
- (val & (FPCR_FZ | FPCR_AH)) == FPCR_FZ;
- set_flush_inputs_to_zero(fitz_enabled, &env->vfp.fp_status[FPST_A64]);
- }
- if (changed & FPCR_DN) {
- bool dnan_enabled = val & FPCR_DN;
- set_default_nan_mode(dnan_enabled, &env->vfp.fp_status[FPST_A32]);
- set_default_nan_mode(dnan_enabled, &env->vfp.fp_status[FPST_A64]);
- set_default_nan_mode(dnan_enabled, &env->vfp.fp_status[FPST_A32_F16]);
- set_default_nan_mode(dnan_enabled, &env->vfp.fp_status[FPST_A64_F16]);
- set_default_nan_mode(dnan_enabled, &env->vfp.fp_status[FPST_AH]);
- set_default_nan_mode(dnan_enabled, &env->vfp.fp_status[FPST_AH_F16]);
- }
- if (changed & FPCR_AH) {
- bool ah_enabled = val & FPCR_AH;
-
- if (ah_enabled) {
- /* Change behaviours for A64 FP operations */
- arm_set_ah_fp_behaviours(&env->vfp.fp_status[FPST_A64]);
- arm_set_ah_fp_behaviours(&env->vfp.fp_status[FPST_A64_F16]);
- } else {
- arm_set_default_fp_behaviours(&env->vfp.fp_status[FPST_A64]);
- arm_set_default_fp_behaviours(&env->vfp.fp_status[FPST_A64_F16]);
- }
- }
- /*
- * If any bits changed that we look at in vfp_get_fpsr_from_host(),
- * we must sync the float_status flags into vfp.fpsr now (under the
- * old regime) before we update vfp.fpcr.
- */
- if (changed & (FPCR_FZ | FPCR_AH | FPCR_FIZ)) {
- vfp_sync_and_clear_float_status_exc_flags(env);
- }
-}
-
-#else
-
-static uint32_t vfp_get_fpsr_from_host(CPUARMState *env)
-{
- return 0;
-}
-
-static void vfp_clear_float_status_exc_flags(CPUARMState *env)
-{
-}
-
-static void vfp_set_fpcr_to_host(CPUARMState *env, uint32_t val, uint32_t mask)
-{
-}
-
-#endif
-
-uint32_t vfp_get_fpcr(CPUARMState *env)
-{
- uint32_t fpcr = env->vfp.fpcr
- | (env->vfp.vec_len << 16)
- | (env->vfp.vec_stride << 20);
-
- /*
- * M-profile LTPSIZE is the same bits [18:16] as A-profile Len; whichever
- * of the two is not applicable to this CPU will always be zero.
- */
- fpcr |= env->v7m.ltpsize << 16;
-
- return fpcr;
-}
-
-uint32_t vfp_get_fpsr(CPUARMState *env)
-{
- uint32_t fpsr = env->vfp.fpsr;
- uint32_t i;
-
- fpsr |= vfp_get_fpsr_from_host(env);
-
- i = env->vfp.qc[0] | env->vfp.qc[1] | env->vfp.qc[2] | env->vfp.qc[3];
- fpsr |= i ? FPSR_QC : 0;
- return fpsr;
-}
-
-uint32_t HELPER(vfp_get_fpscr)(CPUARMState *env)
-{
- return (vfp_get_fpcr(env) & FPSCR_FPCR_MASK) |
- (vfp_get_fpsr(env) & FPSCR_FPSR_MASK);
-}
-
-uint32_t vfp_get_fpscr(CPUARMState *env)
-{
- return HELPER(vfp_get_fpscr)(env);
-}
-
-void vfp_set_fpsr(CPUARMState *env, uint32_t val)
-{
- ARMCPU *cpu = env_archcpu(env);
-
- if (arm_feature(env, ARM_FEATURE_NEON) ||
- cpu_isar_feature(aa32_mve, cpu)) {
- /*
- * The bit we set within vfp.qc[] is arbitrary; the array as a
- * whole being zero/non-zero is what counts.
- */
- env->vfp.qc[0] = val & FPSR_QC;
- env->vfp.qc[1] = 0;
- env->vfp.qc[2] = 0;
- env->vfp.qc[3] = 0;
- }
-
- /*
- * NZCV lives only in env->vfp.fpsr. The cumulative exception flags
- * IOC|DZC|OFC|UFC|IXC|IDC also live in env->vfp.fpsr, with possible
- * extra pending exception information that hasn't yet been folded in
- * living in the float_status values (for TCG).
- * Since this FPSR write gives us the up to date values of the exception
- * flags, we want to store into vfp.fpsr the NZCV and CEXC bits, zeroing
- * anything else. We also need to clear out the float_status exception
- * information so that the next vfp_get_fpsr does not fold in stale data.
- */
- val &= FPSR_NZCV_MASK | FPSR_CEXC_MASK;
- env->vfp.fpsr = val;
- vfp_clear_float_status_exc_flags(env);
-}
-
-static void vfp_set_fpcr_masked(CPUARMState *env, uint32_t val, uint32_t mask)
-{
- /*
- * We only set FPCR bits defined by mask, and leave the others alone.
- * We assume the mask is sensible (e.g. doesn't try to set only
- * part of a field)
- */
- ARMCPU *cpu = env_archcpu(env);
-
- /* When ARMv8.2-FP16 is not supported, FZ16 is RES0. */
- if (!cpu_isar_feature(any_fp16, cpu)) {
- val &= ~FPCR_FZ16;
- }
- if (!cpu_isar_feature(aa64_afp, cpu)) {
- val &= ~(FPCR_FIZ | FPCR_AH | FPCR_NEP);
- }
-
- if (!cpu_isar_feature(aa64_ebf16, cpu)) {
- val &= ~FPCR_EBF;
- }
-
- vfp_set_fpcr_to_host(env, val, mask);
-
- if (mask & (FPCR_LEN_MASK | FPCR_STRIDE_MASK)) {
- if (!arm_feature(env, ARM_FEATURE_M)) {
- /*
- * Short-vector length and stride; on M-profile these bits
- * are used for different purposes.
- * We can't make this conditional be "if MVFR0.FPShVec != 0",
- * because in v7A no-short-vector-support cores still had to
- * allow Stride/Len to be written with the only effect that
- * some insns are required to UNDEF if the guest sets them.
- */
- env->vfp.vec_len = extract32(val, 16, 3);
- env->vfp.vec_stride = extract32(val, 20, 2);
- } else if (cpu_isar_feature(aa32_mve, cpu)) {
- env->v7m.ltpsize = extract32(val, FPCR_LTPSIZE_SHIFT,
- FPCR_LTPSIZE_LENGTH);
- }
- }
-
- /*
- * We don't implement trapped exception handling, so the
- * trap enable bits, IDE|IXE|UFE|OFE|DZE|IOE are all RAZ/WI (not RES0!)
- *
- * The FPCR bits we keep in vfp.fpcr are AHP, DN, FZ, RMode, EBF, FZ16,
- * FIZ, AH, and NEP.
- * Len, Stride and LTPSIZE we just handled. Store those bits
- * there, and zero any of the other FPCR bits and the RES0 and RAZ/WI
- * bits.
- */
- val &= FPCR_AHP | FPCR_DN | FPCR_FZ | FPCR_RMODE_MASK | FPCR_FZ16 |
- FPCR_EBF | FPCR_FIZ | FPCR_AH | FPCR_NEP;
- env->vfp.fpcr &= ~mask;
- env->vfp.fpcr |= val;
-}
-
-void vfp_set_fpcr(CPUARMState *env, uint32_t val)
-{
- vfp_set_fpcr_masked(env, val, MAKE_64BIT_MASK(0, 32));
-}
-
-void HELPER(vfp_set_fpscr)(CPUARMState *env, uint32_t val)
-{
- vfp_set_fpcr_masked(env, val, FPSCR_FPCR_MASK);
- vfp_set_fpsr(env, val & FPSCR_FPSR_MASK);
-}
-
-void vfp_set_fpscr(CPUARMState *env, uint32_t val)
-{
- HELPER(vfp_set_fpscr)(env, val);
-}
-
-#ifdef CONFIG_TCG
#define VFP_HELPER(name, p) HELPER(glue(glue(vfp_,name),p))
@@ -1519,5 +1128,3 @@ void HELPER(check_hcr_el2_trap)(CPUARMState *env, uint32_t rt, uint32_t reg)
raise_exception(env, EXCP_HYP_TRAP, syndrome, 2);
}
-
-#endif
diff --git a/target/arm/vfp_helper.c b/target/arm/vfp_helper.c
index 5d424477a2d..0e849d8d4dc 100644
--- a/target/arm/vfp_helper.c
+++ b/target/arm/vfp_helper.c
@@ -23,13 +23,6 @@
#include "internals.h"
#include "cpu-features.h"
#include "fpu/softfloat.h"
-#ifdef CONFIG_TCG
-#include "qemu/log.h"
-#endif
-
-/* VFP support. We follow the convention used for VFP instructions:
- Single precision routines have a "s" suffix, double precision a
- "d" suffix. */
/*
* Set the float_status behaviour to match the Arm defaults:
@@ -419,1105 +412,3 @@ void vfp_set_fpscr(CPUARMState *env, uint32_t val)
{
HELPER(vfp_set_fpscr)(env, val);
}
-
-#ifdef CONFIG_TCG
-
-#define VFP_HELPER(name, p) HELPER(glue(glue(vfp_,name),p))
-
-#define VFP_BINOP(name) \
-dh_ctype_f16 VFP_HELPER(name, h)(dh_ctype_f16 a, dh_ctype_f16 b, float_status *fpst) \
-{ \
- return float16_ ## name(a, b, fpst); \
-} \
-float32 VFP_HELPER(name, s)(float32 a, float32 b, float_status *fpst) \
-{ \
- return float32_ ## name(a, b, fpst); \
-} \
-float64 VFP_HELPER(name, d)(float64 a, float64 b, float_status *fpst) \
-{ \
- return float64_ ## name(a, b, fpst); \
-}
-VFP_BINOP(add)
-VFP_BINOP(sub)
-VFP_BINOP(mul)
-VFP_BINOP(div)
-VFP_BINOP(min)
-VFP_BINOP(max)
-VFP_BINOP(minnum)
-VFP_BINOP(maxnum)
-#undef VFP_BINOP
-
-dh_ctype_f16 VFP_HELPER(sqrt, h)(dh_ctype_f16 a, float_status *fpst)
-{
- return float16_sqrt(a, fpst);
-}
-
-float32 VFP_HELPER(sqrt, s)(float32 a, float_status *fpst)
-{
- return float32_sqrt(a, fpst);
-}
-
-float64 VFP_HELPER(sqrt, d)(float64 a, float_status *fpst)
-{
- return float64_sqrt(a, fpst);
-}
-
-static void softfloat_to_vfp_compare(CPUARMState *env, FloatRelation cmp)
-{
- uint32_t flags;
- switch (cmp) {
- case float_relation_equal:
- flags = 0x6;
- break;
- case float_relation_less:
- flags = 0x8;
- break;
- case float_relation_greater:
- flags = 0x2;
- break;
- case float_relation_unordered:
- flags = 0x3;
- break;
- default:
- g_assert_not_reached();
- }
- env->vfp.fpsr = deposit64(env->vfp.fpsr, 28, 4, flags); /* NZCV */
-}
-
-/* XXX: check quiet/signaling case */
-#define DO_VFP_cmp(P, FLOATTYPE, ARGTYPE, FPST) \
-void VFP_HELPER(cmp, P)(ARGTYPE a, ARGTYPE b, CPUARMState *env) \
-{ \
- softfloat_to_vfp_compare(env, \
- FLOATTYPE ## _compare_quiet(a, b, &env->vfp.fp_status[FPST])); \
-} \
-void VFP_HELPER(cmpe, P)(ARGTYPE a, ARGTYPE b, CPUARMState *env) \
-{ \
- softfloat_to_vfp_compare(env, \
- FLOATTYPE ## _compare(a, b, &env->vfp.fp_status[FPST])); \
-}
-DO_VFP_cmp(h, float16, dh_ctype_f16, FPST_A32_F16)
-DO_VFP_cmp(s, float32, float32, FPST_A32)
-DO_VFP_cmp(d, float64, float64, FPST_A32)
-#undef DO_VFP_cmp
-
-/* Integer to float and float to integer conversions */
-
-#define CONV_ITOF(name, ftype, fsz, sign) \
-ftype HELPER(name)(uint32_t x, float_status *fpst) \
-{ \
- return sign##int32_to_##float##fsz((sign##int32_t)x, fpst); \
-}
-
-#define CONV_FTOI(name, ftype, fsz, sign, round) \
-sign##int32_t HELPER(name)(ftype x, float_status *fpst) \
-{ \
- if (float##fsz##_is_any_nan(x)) { \
- float_raise(float_flag_invalid, fpst); \
- return 0; \
- } \
- return float##fsz##_to_##sign##int32##round(x, fpst); \
-}
-
-#define FLOAT_CONVS(name, p, ftype, fsz, sign) \
- CONV_ITOF(vfp_##name##to##p, ftype, fsz, sign) \
- CONV_FTOI(vfp_to##name##p, ftype, fsz, sign, ) \
- CONV_FTOI(vfp_to##name##z##p, ftype, fsz, sign, _round_to_zero)
-
-FLOAT_CONVS(si, h, uint32_t, 16, )
-FLOAT_CONVS(si, s, float32, 32, )
-FLOAT_CONVS(si, d, float64, 64, )
-FLOAT_CONVS(ui, h, uint32_t, 16, u)
-FLOAT_CONVS(ui, s, float32, 32, u)
-FLOAT_CONVS(ui, d, float64, 64, u)
-
-#undef CONV_ITOF
-#undef CONV_FTOI
-#undef FLOAT_CONVS
-
-/* floating point conversion */
-float64 VFP_HELPER(fcvtd, s)(float32 x, float_status *status)
-{
- return float32_to_float64(x, status);
-}
-
-float32 VFP_HELPER(fcvts, d)(float64 x, float_status *status)
-{
- return float64_to_float32(x, status);
-}
-
-uint32_t HELPER(bfcvt)(float32 x, float_status *status)
-{
- return float32_to_bfloat16(x, status);
-}
-
-uint32_t HELPER(bfcvt_pair)(uint64_t pair, float_status *status)
-{
- bfloat16 lo = float32_to_bfloat16(extract64(pair, 0, 32), status);
- bfloat16 hi = float32_to_bfloat16(extract64(pair, 32, 32), status);
- return deposit32(lo, 16, 16, hi);
-}
-
-/*
- * VFP3 fixed point conversion. The AArch32 versions of fix-to-float
- * must always round-to-nearest; the AArch64 ones honour the FPSCR
- * rounding mode. (For AArch32 Neon the standard-FPSCR is set to
- * round-to-nearest so either helper will work.) AArch32 float-to-fix
- * must round-to-zero.
- */
-#define VFP_CONV_FIX_FLOAT(name, p, fsz, ftype, isz, itype) \
-ftype HELPER(vfp_##name##to##p)(uint##isz##_t x, uint32_t shift, \
- float_status *fpst) \
-{ return itype##_to_##float##fsz##_scalbn(x, -shift, fpst); }
-
-#define VFP_CONV_FIX_FLOAT_ROUND(name, p, fsz, ftype, isz, itype) \
- ftype HELPER(vfp_##name##to##p##_round_to_nearest)(uint##isz##_t x, \
- uint32_t shift, \
- float_status *fpst) \
- { \
- ftype ret; \
- FloatRoundMode oldmode = fpst->float_rounding_mode; \
- fpst->float_rounding_mode = float_round_nearest_even; \
- ret = itype##_to_##float##fsz##_scalbn(x, -shift, fpst); \
- fpst->float_rounding_mode = oldmode; \
- return ret; \
- }
-
-#define VFP_CONV_FLOAT_FIX_ROUND(name, p, fsz, ftype, isz, itype, ROUND, suff) \
-uint##isz##_t HELPER(vfp_to##name##p##suff)(ftype x, uint32_t shift, \
- float_status *fpst) \
-{ \
- if (unlikely(float##fsz##_is_any_nan(x))) { \
- float_raise(float_flag_invalid, fpst); \
- return 0; \
- } \
- return float##fsz##_to_##itype##_scalbn(x, ROUND, shift, fpst); \
-}
-
-#define VFP_CONV_FIX(name, p, fsz, ftype, isz, itype) \
-VFP_CONV_FIX_FLOAT(name, p, fsz, ftype, isz, itype) \
-VFP_CONV_FIX_FLOAT_ROUND(name, p, fsz, ftype, isz, itype) \
-VFP_CONV_FLOAT_FIX_ROUND(name, p, fsz, ftype, isz, itype, \
- float_round_to_zero, _round_to_zero) \
-VFP_CONV_FLOAT_FIX_ROUND(name, p, fsz, ftype, isz, itype, \
- get_float_rounding_mode(fpst), )
-
-#define VFP_CONV_FIX_A64(name, p, fsz, ftype, isz, itype) \
-VFP_CONV_FIX_FLOAT(name, p, fsz, ftype, isz, itype) \
-VFP_CONV_FLOAT_FIX_ROUND(name, p, fsz, ftype, isz, itype, \
- get_float_rounding_mode(fpst), )
-
-VFP_CONV_FIX(sh, d, 64, float64, 64, int16)
-VFP_CONV_FIX(sl, d, 64, float64, 64, int32)
-VFP_CONV_FIX_A64(sq, d, 64, float64, 64, int64)
-VFP_CONV_FIX(uh, d, 64, float64, 64, uint16)
-VFP_CONV_FIX(ul, d, 64, float64, 64, uint32)
-VFP_CONV_FIX_A64(uq, d, 64, float64, 64, uint64)
-VFP_CONV_FIX(sh, s, 32, float32, 32, int16)
-VFP_CONV_FIX(sl, s, 32, float32, 32, int32)
-VFP_CONV_FIX_A64(sq, s, 32, float32, 64, int64)
-VFP_CONV_FIX(uh, s, 32, float32, 32, uint16)
-VFP_CONV_FIX(ul, s, 32, float32, 32, uint32)
-VFP_CONV_FIX_A64(uq, s, 32, float32, 64, uint64)
-VFP_CONV_FIX(sh, h, 16, dh_ctype_f16, 32, int16)
-VFP_CONV_FIX(sl, h, 16, dh_ctype_f16, 32, int32)
-VFP_CONV_FIX_A64(sq, h, 16, dh_ctype_f16, 64, int64)
-VFP_CONV_FIX(uh, h, 16, dh_ctype_f16, 32, uint16)
-VFP_CONV_FIX(ul, h, 16, dh_ctype_f16, 32, uint32)
-VFP_CONV_FIX_A64(uq, h, 16, dh_ctype_f16, 64, uint64)
-VFP_CONV_FLOAT_FIX_ROUND(sq, d, 64, float64, 64, int64,
- float_round_to_zero, _round_to_zero)
-VFP_CONV_FLOAT_FIX_ROUND(uq, d, 64, float64, 64, uint64,
- float_round_to_zero, _round_to_zero)
-
-#undef VFP_CONV_FIX
-#undef VFP_CONV_FIX_FLOAT
-#undef VFP_CONV_FLOAT_FIX_ROUND
-#undef VFP_CONV_FIX_A64
-
-/* Set the current fp rounding mode and return the old one.
- * The argument is a softfloat float_round_ value.
- */
-uint32_t HELPER(set_rmode)(uint32_t rmode, float_status *fp_status)
-{
- uint32_t prev_rmode = get_float_rounding_mode(fp_status);
- set_float_rounding_mode(rmode, fp_status);
-
- return prev_rmode;
-}
-
-/* Half precision conversions. */
-float32 HELPER(vfp_fcvt_f16_to_f32)(uint32_t a, float_status *fpst,
- uint32_t ahp_mode)
-{
- /* Squash FZ16 to 0 for the duration of conversion. In this case,
- * it would affect flushing input denormals.
- */
- bool save = get_flush_inputs_to_zero(fpst);
- set_flush_inputs_to_zero(false, fpst);
- float32 r = float16_to_float32(a, !ahp_mode, fpst);
- set_flush_inputs_to_zero(save, fpst);
- return r;
-}
-
-uint32_t HELPER(vfp_fcvt_f32_to_f16)(float32 a, float_status *fpst,
- uint32_t ahp_mode)
-{
- /* Squash FZ16 to 0 for the duration of conversion. In this case,
- * it would affect flushing output denormals.
- */
- bool save = get_flush_to_zero(fpst);
- set_flush_to_zero(false, fpst);
- float16 r = float32_to_float16(a, !ahp_mode, fpst);
- set_flush_to_zero(save, fpst);
- return r;
-}
-
-float64 HELPER(vfp_fcvt_f16_to_f64)(uint32_t a, float_status *fpst,
- uint32_t ahp_mode)
-{
- /* Squash FZ16 to 0 for the duration of conversion. In this case,
- * it would affect flushing input denormals.
- */
- bool save = get_flush_inputs_to_zero(fpst);
- set_flush_inputs_to_zero(false, fpst);
- float64 r = float16_to_float64(a, !ahp_mode, fpst);
- set_flush_inputs_to_zero(save, fpst);
- return r;
-}
-
-uint32_t HELPER(vfp_fcvt_f64_to_f16)(float64 a, float_status *fpst,
- uint32_t ahp_mode)
-{
- /* Squash FZ16 to 0 for the duration of conversion. In this case,
- * it would affect flushing output denormals.
- */
- bool save = get_flush_to_zero(fpst);
- set_flush_to_zero(false, fpst);
- float16 r = float64_to_float16(a, !ahp_mode, fpst);
- set_flush_to_zero(save, fpst);
- return r;
-}
-
-/* NEON helpers. */
-
-/* Constants 256 and 512 are used in some helpers; we avoid relying on
- * int->float conversions at run-time. */
-#define float64_256 make_float64(0x4070000000000000LL)
-#define float64_512 make_float64(0x4080000000000000LL)
-#define float16_maxnorm make_float16(0x7bff)
-#define float32_maxnorm make_float32(0x7f7fffff)
-#define float64_maxnorm make_float64(0x7fefffffffffffffLL)
-
-/* Reciprocal functions
- *
- * The algorithm that must be used to calculate the estimate
- * is specified by the ARM ARM, see FPRecipEstimate()/RecipEstimate
- */
-
-/* See RecipEstimate()
- *
- * input is a 9 bit fixed point number
- * input range 256 .. 511 for a number from 0.5 <= x < 1.0.
- * result range 256 .. 511 for a number from 1.0 to 511/256.
- */
-
-static int recip_estimate(int input)
-{
- int a, b, r;
- assert(256 <= input && input < 512);
- a = (input * 2) + 1;
- b = (1 << 19) / a;
- r = (b + 1) >> 1;
- assert(256 <= r && r < 512);
- return r;
-}
-
-/*
- * Increased precision version:
- * input is a 13 bit fixed point number
- * input range 2048 .. 4095 for a number from 0.5 <= x < 1.0.
- * result range 4096 .. 8191 for a number from 1.0 to 2.0
- */
-static int recip_estimate_incprec(int input)
-{
- int a, b, r;
- assert(2048 <= input && input < 4096);
- a = (input * 2) + 1;
- /*
- * The pseudocode expresses this as an operation on infinite
- * precision reals where it calculates 2^25 / a and then looks
- * at the error between that and the rounded-down-to-integer
- * value to see if it should instead round up. We instead
- * follow the same approach as the pseudocode for the 8-bit
- * precision version, and calculate (2 * (2^25 / a)) as an
- * integer so we can do the "add one and halve" to round it.
- * So the 1 << 26 here is correct.
- */
- b = (1 << 26) / a;
- r = (b + 1) >> 1;
- assert(4096 <= r && r < 8192);
- return r;
-}
-
-/*
- * Common wrapper to call recip_estimate
- *
- * The parameters are exponent and 64 bit fraction (without implicit
- * bit) where the binary point is nominally at bit 52. Returns a
- * float64 which can then be rounded to the appropriate size by the
- * callee.
- */
-
-static uint64_t call_recip_estimate(int *exp, int exp_off, uint64_t frac,
- bool increasedprecision)
-{
- uint32_t scaled, estimate;
- uint64_t result_frac;
- int result_exp;
-
- /* Handle sub-normals */
- if (*exp == 0) {
- if (extract64(frac, 51, 1) == 0) {
- *exp = -1;
- frac <<= 2;
- } else {
- frac <<= 1;
- }
- }
-
- if (increasedprecision) {
- /* scaled = UInt('1':fraction<51:41>) */
- scaled = deposit32(1 << 11, 0, 11, extract64(frac, 41, 11));
- estimate = recip_estimate_incprec(scaled);
- } else {
- /* scaled = UInt('1':fraction<51:44>) */
- scaled = deposit32(1 << 8, 0, 8, extract64(frac, 44, 8));
- estimate = recip_estimate(scaled);
- }
-
- result_exp = exp_off - *exp;
- if (increasedprecision) {
- result_frac = deposit64(0, 40, 12, estimate);
- } else {
- result_frac = deposit64(0, 44, 8, estimate);
- }
- if (result_exp == 0) {
- result_frac = deposit64(result_frac >> 1, 51, 1, 1);
- } else if (result_exp == -1) {
- result_frac = deposit64(result_frac >> 2, 50, 2, 1);
- result_exp = 0;
- }
-
- *exp = result_exp;
-
- return result_frac;
-}
-
-static bool round_to_inf(float_status *fpst, bool sign_bit)
-{
- switch (fpst->float_rounding_mode) {
- case float_round_nearest_even: /* Round to Nearest */
- return true;
- case float_round_up: /* Round to +Inf */
- return !sign_bit;
- case float_round_down: /* Round to -Inf */
- return sign_bit;
- case float_round_to_zero: /* Round to Zero */
- return false;
- default:
- g_assert_not_reached();
- }
-}
-
-uint32_t HELPER(recpe_f16)(uint32_t input, float_status *fpst)
-{
- float16 f16 = float16_squash_input_denormal(input, fpst);
- uint32_t f16_val = float16_val(f16);
- uint32_t f16_sign = float16_is_neg(f16);
- int f16_exp = extract32(f16_val, 10, 5);
- uint32_t f16_frac = extract32(f16_val, 0, 10);
- uint64_t f64_frac;
-
- if (float16_is_any_nan(f16)) {
- float16 nan = f16;
- if (float16_is_signaling_nan(f16, fpst)) {
- float_raise(float_flag_invalid, fpst);
- if (!fpst->default_nan_mode) {
- nan = float16_silence_nan(f16, fpst);
- }
- }
- if (fpst->default_nan_mode) {
- nan = float16_default_nan(fpst);
- }
- return nan;
- } else if (float16_is_infinity(f16)) {
- return float16_set_sign(float16_zero, float16_is_neg(f16));
- } else if (float16_is_zero(f16)) {
- float_raise(float_flag_divbyzero, fpst);
- return float16_set_sign(float16_infinity, float16_is_neg(f16));
- } else if (float16_abs(f16) < (1 << 8)) {
- /* Abs(value) < 2.0^-16 */
- float_raise(float_flag_overflow | float_flag_inexact, fpst);
- if (round_to_inf(fpst, f16_sign)) {
- return float16_set_sign(float16_infinity, f16_sign);
- } else {
- return float16_set_sign(float16_maxnorm, f16_sign);
- }
- } else if (f16_exp >= 29 && fpst->flush_to_zero) {
- float_raise(float_flag_underflow, fpst);
- return float16_set_sign(float16_zero, float16_is_neg(f16));
- }
-
- f64_frac = call_recip_estimate(&f16_exp, 29,
- ((uint64_t) f16_frac) << (52 - 10), false);
-
- /* result = sign : result_exp<4:0> : fraction<51:42> */
- f16_val = deposit32(0, 15, 1, f16_sign);
- f16_val = deposit32(f16_val, 10, 5, f16_exp);
- f16_val = deposit32(f16_val, 0, 10, extract64(f64_frac, 52 - 10, 10));
- return make_float16(f16_val);
-}
-
-/*
- * FEAT_RPRES means the f32 FRECPE has an "increased precision" variant
- * which is used when FPCR.AH == 1.
- */
-static float32 do_recpe_f32(float32 input, float_status *fpst, bool rpres)
-{
- float32 f32 = float32_squash_input_denormal(input, fpst);
- uint32_t f32_val = float32_val(f32);
- bool f32_sign = float32_is_neg(f32);
- int f32_exp = extract32(f32_val, 23, 8);
- uint32_t f32_frac = extract32(f32_val, 0, 23);
- uint64_t f64_frac;
-
- if (float32_is_any_nan(f32)) {
- float32 nan = f32;
- if (float32_is_signaling_nan(f32, fpst)) {
- float_raise(float_flag_invalid, fpst);
- if (!fpst->default_nan_mode) {
- nan = float32_silence_nan(f32, fpst);
- }
- }
- if (fpst->default_nan_mode) {
- nan = float32_default_nan(fpst);
- }
- return nan;
- } else if (float32_is_infinity(f32)) {
- return float32_set_sign(float32_zero, float32_is_neg(f32));
- } else if (float32_is_zero(f32)) {
- float_raise(float_flag_divbyzero, fpst);
- return float32_set_sign(float32_infinity, float32_is_neg(f32));
- } else if (float32_abs(f32) < (1ULL << 21)) {
- /* Abs(value) < 2.0^-128 */
- float_raise(float_flag_overflow | float_flag_inexact, fpst);
- if (round_to_inf(fpst, f32_sign)) {
- return float32_set_sign(float32_infinity, f32_sign);
- } else {
- return float32_set_sign(float32_maxnorm, f32_sign);
- }
- } else if (f32_exp >= 253 && fpst->flush_to_zero) {
- float_raise(float_flag_underflow, fpst);
- return float32_set_sign(float32_zero, float32_is_neg(f32));
- }
-
- f64_frac = call_recip_estimate(&f32_exp, 253,
- ((uint64_t) f32_frac) << (52 - 23), rpres);
-
- /* result = sign : result_exp<7:0> : fraction<51:29> */
- f32_val = deposit32(0, 31, 1, f32_sign);
- f32_val = deposit32(f32_val, 23, 8, f32_exp);
- f32_val = deposit32(f32_val, 0, 23, extract64(f64_frac, 52 - 23, 23));
- return make_float32(f32_val);
-}
-
-float32 HELPER(recpe_f32)(float32 input, float_status *fpst)
-{
- return do_recpe_f32(input, fpst, false);
-}
-
-float32 HELPER(recpe_rpres_f32)(float32 input, float_status *fpst)
-{
- return do_recpe_f32(input, fpst, true);
-}
-
-float64 HELPER(recpe_f64)(float64 input, float_status *fpst)
-{
- float64 f64 = float64_squash_input_denormal(input, fpst);
- uint64_t f64_val = float64_val(f64);
- bool f64_sign = float64_is_neg(f64);
- int f64_exp = extract64(f64_val, 52, 11);
- uint64_t f64_frac = extract64(f64_val, 0, 52);
-
- /* Deal with any special cases */
- if (float64_is_any_nan(f64)) {
- float64 nan = f64;
- if (float64_is_signaling_nan(f64, fpst)) {
- float_raise(float_flag_invalid, fpst);
- if (!fpst->default_nan_mode) {
- nan = float64_silence_nan(f64, fpst);
- }
- }
- if (fpst->default_nan_mode) {
- nan = float64_default_nan(fpst);
- }
- return nan;
- } else if (float64_is_infinity(f64)) {
- return float64_set_sign(float64_zero, float64_is_neg(f64));
- } else if (float64_is_zero(f64)) {
- float_raise(float_flag_divbyzero, fpst);
- return float64_set_sign(float64_infinity, float64_is_neg(f64));
- } else if ((f64_val & ~(1ULL << 63)) < (1ULL << 50)) {
- /* Abs(value) < 2.0^-1024 */
- float_raise(float_flag_overflow | float_flag_inexact, fpst);
- if (round_to_inf(fpst, f64_sign)) {
- return float64_set_sign(float64_infinity, f64_sign);
- } else {
- return float64_set_sign(float64_maxnorm, f64_sign);
- }
- } else if (f64_exp >= 2045 && fpst->flush_to_zero) {
- float_raise(float_flag_underflow, fpst);
- return float64_set_sign(float64_zero, float64_is_neg(f64));
- }
-
- f64_frac = call_recip_estimate(&f64_exp, 2045, f64_frac, false);
-
- /* result = sign : result_exp<10:0> : fraction<51:0>; */
- f64_val = deposit64(0, 63, 1, f64_sign);
- f64_val = deposit64(f64_val, 52, 11, f64_exp);
- f64_val = deposit64(f64_val, 0, 52, f64_frac);
- return make_float64(f64_val);
-}
-
-/* The algorithm that must be used to calculate the estimate
- * is specified by the ARM ARM.
- */
-
-static int do_recip_sqrt_estimate(int a)
-{
- int b, estimate;
-
- assert(128 <= a && a < 512);
- if (a < 256) {
- a = a * 2 + 1;
- } else {
- a = (a >> 1) << 1;
- a = (a + 1) * 2;
- }
- b = 512;
- while (a * (b + 1) * (b + 1) < (1 << 28)) {
- b += 1;
- }
- estimate = (b + 1) / 2;
- assert(256 <= estimate && estimate < 512);
-
- return estimate;
-}
-
-static int do_recip_sqrt_estimate_incprec(int a)
-{
- /*
- * The Arm ARM describes the 12-bit precision version of RecipSqrtEstimate
- * in terms of an infinite-precision floating point calculation of a
- * square root. We implement this using the same kind of pure integer
- * algorithm as the 8-bit mantissa, to get the same bit-for-bit result.
- */
- int64_t b, estimate;
-
- assert(1024 <= a && a < 4096);
- if (a < 2048) {
- a = a * 2 + 1;
- } else {
- a = (a >> 1) << 1;
- a = (a + 1) * 2;
- }
- b = 8192;
- while (a * (b + 1) * (b + 1) < (1ULL << 39)) {
- b += 1;
- }
- estimate = (b + 1) / 2;
-
- assert(4096 <= estimate && estimate < 8192);
-
- return estimate;
-}
-
-static uint64_t recip_sqrt_estimate(int *exp , int exp_off, uint64_t frac,
- bool increasedprecision)
-{
- int estimate;
- uint32_t scaled;
-
- if (*exp == 0) {
- while (extract64(frac, 51, 1) == 0) {
- frac = frac << 1;
- *exp -= 1;
- }
- frac = extract64(frac, 0, 51) << 1;
- }
-
- if (increasedprecision) {
- if (*exp & 1) {
- /* scaled = UInt('01':fraction<51:42>) */
- scaled = deposit32(1 << 10, 0, 10, extract64(frac, 42, 10));
- } else {
- /* scaled = UInt('1':fraction<51:41>) */
- scaled = deposit32(1 << 11, 0, 11, extract64(frac, 41, 11));
- }
- estimate = do_recip_sqrt_estimate_incprec(scaled);
- } else {
- if (*exp & 1) {
- /* scaled = UInt('01':fraction<51:45>) */
- scaled = deposit32(1 << 7, 0, 7, extract64(frac, 45, 7));
- } else {
- /* scaled = UInt('1':fraction<51:44>) */
- scaled = deposit32(1 << 8, 0, 8, extract64(frac, 44, 8));
- }
- estimate = do_recip_sqrt_estimate(scaled);
- }
-
- *exp = (exp_off - *exp) / 2;
- if (increasedprecision) {
- return extract64(estimate, 0, 12) << 40;
- } else {
- return extract64(estimate, 0, 8) << 44;
- }
-}
-
-uint32_t HELPER(rsqrte_f16)(uint32_t input, float_status *s)
-{
- float16 f16 = float16_squash_input_denormal(input, s);
- uint16_t val = float16_val(f16);
- bool f16_sign = float16_is_neg(f16);
- int f16_exp = extract32(val, 10, 5);
- uint16_t f16_frac = extract32(val, 0, 10);
- uint64_t f64_frac;
-
- if (float16_is_any_nan(f16)) {
- float16 nan = f16;
- if (float16_is_signaling_nan(f16, s)) {
- float_raise(float_flag_invalid, s);
- if (!s->default_nan_mode) {
- nan = float16_silence_nan(f16, s);
- }
- }
- if (s->default_nan_mode) {
- nan = float16_default_nan(s);
- }
- return nan;
- } else if (float16_is_zero(f16)) {
- float_raise(float_flag_divbyzero, s);
- return float16_set_sign(float16_infinity, f16_sign);
- } else if (f16_sign) {
- float_raise(float_flag_invalid, s);
- return float16_default_nan(s);
- } else if (float16_is_infinity(f16)) {
- return float16_zero;
- }
-
- /* Scale and normalize to a double-precision value between 0.25 and 1.0,
- * preserving the parity of the exponent. */
-
- f64_frac = ((uint64_t) f16_frac) << (52 - 10);
-
- f64_frac = recip_sqrt_estimate(&f16_exp, 44, f64_frac, false);
-
- /* result = sign : result_exp<4:0> : estimate<7:0> : Zeros(2) */
- val = deposit32(0, 15, 1, f16_sign);
- val = deposit32(val, 10, 5, f16_exp);
- val = deposit32(val, 2, 8, extract64(f64_frac, 52 - 8, 8));
- return make_float16(val);
-}
-
-/*
- * FEAT_RPRES means the f32 FRSQRTE has an "increased precision" variant
- * which is used when FPCR.AH == 1.
- */
-static float32 do_rsqrte_f32(float32 input, float_status *s, bool rpres)
-{
- float32 f32 = float32_squash_input_denormal(input, s);
- uint32_t val = float32_val(f32);
- uint32_t f32_sign = float32_is_neg(f32);
- int f32_exp = extract32(val, 23, 8);
- uint32_t f32_frac = extract32(val, 0, 23);
- uint64_t f64_frac;
-
- if (float32_is_any_nan(f32)) {
- float32 nan = f32;
- if (float32_is_signaling_nan(f32, s)) {
- float_raise(float_flag_invalid, s);
- if (!s->default_nan_mode) {
- nan = float32_silence_nan(f32, s);
- }
- }
- if (s->default_nan_mode) {
- nan = float32_default_nan(s);
- }
- return nan;
- } else if (float32_is_zero(f32)) {
- float_raise(float_flag_divbyzero, s);
- return float32_set_sign(float32_infinity, float32_is_neg(f32));
- } else if (float32_is_neg(f32)) {
- float_raise(float_flag_invalid, s);
- return float32_default_nan(s);
- } else if (float32_is_infinity(f32)) {
- return float32_zero;
- }
-
- /* Scale and normalize to a double-precision value between 0.25 and 1.0,
- * preserving the parity of the exponent. */
-
- f64_frac = ((uint64_t) f32_frac) << 29;
-
- f64_frac = recip_sqrt_estimate(&f32_exp, 380, f64_frac, rpres);
-
- /*
- * result = sign : result_exp<7:0> : estimate<7:0> : Zeros(15)
- * or for increased precision
- * result = sign : result_exp<7:0> : estimate<11:0> : Zeros(11)
- */
- val = deposit32(0, 31, 1, f32_sign);
- val = deposit32(val, 23, 8, f32_exp);
- if (rpres) {
- val = deposit32(val, 11, 12, extract64(f64_frac, 52 - 12, 12));
- } else {
- val = deposit32(val, 15, 8, extract64(f64_frac, 52 - 8, 8));
- }
- return make_float32(val);
-}
-
-float32 HELPER(rsqrte_f32)(float32 input, float_status *s)
-{
- return do_rsqrte_f32(input, s, false);
-}
-
-float32 HELPER(rsqrte_rpres_f32)(float32 input, float_status *s)
-{
- return do_rsqrte_f32(input, s, true);
-}
-
-float64 HELPER(rsqrte_f64)(float64 input, float_status *s)
-{
- float64 f64 = float64_squash_input_denormal(input, s);
- uint64_t val = float64_val(f64);
- bool f64_sign = float64_is_neg(f64);
- int f64_exp = extract64(val, 52, 11);
- uint64_t f64_frac = extract64(val, 0, 52);
-
- if (float64_is_any_nan(f64)) {
- float64 nan = f64;
- if (float64_is_signaling_nan(f64, s)) {
- float_raise(float_flag_invalid, s);
- if (!s->default_nan_mode) {
- nan = float64_silence_nan(f64, s);
- }
- }
- if (s->default_nan_mode) {
- nan = float64_default_nan(s);
- }
- return nan;
- } else if (float64_is_zero(f64)) {
- float_raise(float_flag_divbyzero, s);
- return float64_set_sign(float64_infinity, float64_is_neg(f64));
- } else if (float64_is_neg(f64)) {
- float_raise(float_flag_invalid, s);
- return float64_default_nan(s);
- } else if (float64_is_infinity(f64)) {
- return float64_zero;
- }
-
- f64_frac = recip_sqrt_estimate(&f64_exp, 3068, f64_frac, false);
-
- /* result = sign : result_exp<4:0> : estimate<7:0> : Zeros(44) */
- val = deposit64(0, 61, 1, f64_sign);
- val = deposit64(val, 52, 11, f64_exp);
- val = deposit64(val, 44, 8, extract64(f64_frac, 52 - 8, 8));
- return make_float64(val);
-}
-
-uint32_t HELPER(recpe_u32)(uint32_t a)
-{
- int input, estimate;
-
- if ((a & 0x80000000) == 0) {
- return 0xffffffff;
- }
-
- input = extract32(a, 23, 9);
- estimate = recip_estimate(input);
-
- return deposit32(0, (32 - 9), 9, estimate);
-}
-
-uint32_t HELPER(rsqrte_u32)(uint32_t a)
-{
- int estimate;
-
- if ((a & 0xc0000000) == 0) {
- return 0xffffffff;
- }
-
- estimate = do_recip_sqrt_estimate(extract32(a, 23, 9));
-
- return deposit32(0, 23, 9, estimate);
-}
-
-/* VFPv4 fused multiply-accumulate */
-dh_ctype_f16 VFP_HELPER(muladd, h)(dh_ctype_f16 a, dh_ctype_f16 b,
- dh_ctype_f16 c, float_status *fpst)
-{
- return float16_muladd(a, b, c, 0, fpst);
-}
-
-float32 VFP_HELPER(muladd, s)(float32 a, float32 b, float32 c,
- float_status *fpst)
-{
- return float32_muladd(a, b, c, 0, fpst);
-}
-
-float64 VFP_HELPER(muladd, d)(float64 a, float64 b, float64 c,
- float_status *fpst)
-{
- return float64_muladd(a, b, c, 0, fpst);
-}
-
-/* ARMv8 round to integral */
-dh_ctype_f16 HELPER(rinth_exact)(dh_ctype_f16 x, float_status *fp_status)
-{
- return float16_round_to_int(x, fp_status);
-}
-
-float32 HELPER(rints_exact)(float32 x, float_status *fp_status)
-{
- return float32_round_to_int(x, fp_status);
-}
-
-float64 HELPER(rintd_exact)(float64 x, float_status *fp_status)
-{
- return float64_round_to_int(x, fp_status);
-}
-
-dh_ctype_f16 HELPER(rinth)(dh_ctype_f16 x, float_status *fp_status)
-{
- int old_flags = get_float_exception_flags(fp_status), new_flags;
- float16 ret;
-
- ret = float16_round_to_int(x, fp_status);
-
- /* Suppress any inexact exceptions the conversion produced */
- if (!(old_flags & float_flag_inexact)) {
- new_flags = get_float_exception_flags(fp_status);
- set_float_exception_flags(new_flags & ~float_flag_inexact, fp_status);
- }
-
- return ret;
-}
-
-float32 HELPER(rints)(float32 x, float_status *fp_status)
-{
- int old_flags = get_float_exception_flags(fp_status), new_flags;
- float32 ret;
-
- ret = float32_round_to_int(x, fp_status);
-
- /* Suppress any inexact exceptions the conversion produced */
- if (!(old_flags & float_flag_inexact)) {
- new_flags = get_float_exception_flags(fp_status);
- set_float_exception_flags(new_flags & ~float_flag_inexact, fp_status);
- }
-
- return ret;
-}
-
-float64 HELPER(rintd)(float64 x, float_status *fp_status)
-{
- int old_flags = get_float_exception_flags(fp_status), new_flags;
- float64 ret;
-
- ret = float64_round_to_int(x, fp_status);
-
- /* Suppress any inexact exceptions the conversion produced */
- if (!(old_flags & float_flag_inexact)) {
- new_flags = get_float_exception_flags(fp_status);
- set_float_exception_flags(new_flags & ~float_flag_inexact, fp_status);
- }
-
- return ret;
-}
-
-/* Convert ARM rounding mode to softfloat */
-const FloatRoundMode arm_rmode_to_sf_map[] = {
- [FPROUNDING_TIEEVEN] = float_round_nearest_even,
- [FPROUNDING_POSINF] = float_round_up,
- [FPROUNDING_NEGINF] = float_round_down,
- [FPROUNDING_ZERO] = float_round_to_zero,
- [FPROUNDING_TIEAWAY] = float_round_ties_away,
- [FPROUNDING_ODD] = float_round_to_odd,
-};
-
-/*
- * Implement float64 to int32_t conversion without saturation;
- * the result is supplied modulo 2^32.
- */
-uint64_t HELPER(fjcvtzs)(float64 value, float_status *status)
-{
- uint32_t frac, e_old, e_new;
- bool inexact;
-
- e_old = get_float_exception_flags(status);
- set_float_exception_flags(0, status);
- frac = float64_to_int32_modulo(value, float_round_to_zero, status);
- e_new = get_float_exception_flags(status);
- set_float_exception_flags(e_old | e_new, status);
-
- /* Normal inexact, denormal with flush-to-zero, or overflow or NaN */
- inexact = e_new & (float_flag_inexact |
- float_flag_input_denormal_flushed |
- float_flag_invalid);
-
- /* While not inexact for IEEE FP, -0.0 is inexact for JavaScript. */
- inexact |= value == float64_chs(float64_zero);
-
- /* Pack the result and the env->ZF representation of Z together. */
- return deposit64(frac, 32, 32, inexact);
-}
-
-uint32_t HELPER(vjcvt)(float64 value, CPUARMState *env)
-{
- uint64_t pair = HELPER(fjcvtzs)(value, &env->vfp.fp_status[FPST_A32]);
- uint32_t result = pair;
- uint32_t z = (pair >> 32) == 0;
-
- /* Store Z, clear NCV, in FPSCR.NZCV. */
- env->vfp.fpsr = (env->vfp.fpsr & ~FPSR_NZCV_MASK) | (z * FPSR_Z);
-
- return result;
-}
-
-/* Round a float32 to an integer that fits in int32_t or int64_t. */
-static float32 frint_s(float32 f, float_status *fpst, int intsize)
-{
- int old_flags = get_float_exception_flags(fpst);
- uint32_t exp = extract32(f, 23, 8);
-
- if (unlikely(exp == 0xff)) {
- /* NaN or Inf. */
- goto overflow;
- }
-
- /* Round and re-extract the exponent. */
- f = float32_round_to_int(f, fpst);
- exp = extract32(f, 23, 8);
-
- /* Validate the range of the result. */
- if (exp < 126 + intsize) {
- /* abs(F) <= INT{N}_MAX */
- return f;
- }
- if (exp == 126 + intsize) {
- uint32_t sign = extract32(f, 31, 1);
- uint32_t frac = extract32(f, 0, 23);
- if (sign && frac == 0) {
- /* F == INT{N}_MIN */
- return f;
- }
- }
-
- overflow:
- /*
- * Raise Invalid and return INT{N}_MIN as a float. Revert any
- * inexact exception float32_round_to_int may have raised.
- */
- set_float_exception_flags(old_flags | float_flag_invalid, fpst);
- return (0x100u + 126u + intsize) << 23;
-}
-
-float32 HELPER(frint32_s)(float32 f, float_status *fpst)
-{
- return frint_s(f, fpst, 32);
-}
-
-float32 HELPER(frint64_s)(float32 f, float_status *fpst)
-{
- return frint_s(f, fpst, 64);
-}
-
-/* Round a float64 to an integer that fits in int32_t or int64_t. */
-static float64 frint_d(float64 f, float_status *fpst, int intsize)
-{
- int old_flags = get_float_exception_flags(fpst);
- uint32_t exp = extract64(f, 52, 11);
-
- if (unlikely(exp == 0x7ff)) {
- /* NaN or Inf. */
- goto overflow;
- }
-
- /* Round and re-extract the exponent. */
- f = float64_round_to_int(f, fpst);
- exp = extract64(f, 52, 11);
-
- /* Validate the range of the result. */
- if (exp < 1022 + intsize) {
- /* abs(F) <= INT{N}_MAX */
- return f;
- }
- if (exp == 1022 + intsize) {
- uint64_t sign = extract64(f, 63, 1);
- uint64_t frac = extract64(f, 0, 52);
- if (sign && frac == 0) {
- /* F == INT{N}_MIN */
- return f;
- }
- }
-
- overflow:
- /*
- * Raise Invalid and return INT{N}_MIN as a float. Revert any
- * inexact exception float64_round_to_int may have raised.
- */
- set_float_exception_flags(old_flags | float_flag_invalid, fpst);
- return (uint64_t)(0x800 + 1022 + intsize) << 52;
-}
-
-float64 HELPER(frint32_d)(float64 f, float_status *fpst)
-{
- return frint_d(f, fpst, 32);
-}
-
-float64 HELPER(frint64_d)(float64 f, float_status *fpst)
-{
- return frint_d(f, fpst, 64);
-}
-
-void HELPER(check_hcr_el2_trap)(CPUARMState *env, uint32_t rt, uint32_t reg)
-{
- uint32_t syndrome;
-
- switch (reg) {
- case ARM_VFP_MVFR0:
- case ARM_VFP_MVFR1:
- case ARM_VFP_MVFR2:
- if (!(arm_hcr_el2_eff(env) & HCR_TID3)) {
- return;
- }
- break;
- case ARM_VFP_FPSID:
- if (!(arm_hcr_el2_eff(env) & HCR_TID0)) {
- return;
- }
- break;
- default:
- g_assert_not_reached();
- }
-
- syndrome = ((EC_FPIDTRAP << ARM_EL_EC_SHIFT)
- | ARM_EL_IL
- | (1 << 24) | (0xe << 20) | (7 << 14)
- | (reg << 10) | (rt << 5) | 1);
-
- raise_exception(env, EXCP_HYP_TRAP, syndrome, 2);
-}
-
-#endif
diff --git a/target/arm/tcg/meson.build b/target/arm/tcg/meson.build
index 1f9077c372c..dd12ccedb18 100644
--- a/target/arm/tcg/meson.build
+++ b/target/arm/tcg/meson.build
@@ -41,6 +41,7 @@ arm_ss.add(files(
'vec_helper.c',
'tlb-insns.c',
'arith_helper.c',
+ 'vfp_helper.c',
))
arm_ss.add(when: 'TARGET_AARCH64', if_true: files(
--
2.43.0
^ permalink raw reply related [flat|nested] 6+ messages in thread