From: Richard Henderson <richard.henderson@linaro.org>
To: qemu-devel@nongnu.org
Cc: peter.maydell@linaro.org, Taylor Simpson <tsimpson@quicinc.com>
Subject: [PULL 15/31] Hexagon (target/hexagon) use softfloat default NaN and tininess
Date: Sat, 1 May 2021 11:43:08 -0700 [thread overview]
Message-ID: <20210501184324.1338186-16-richard.henderson@linaro.org> (raw)
In-Reply-To: <20210501184324.1338186-1-richard.henderson@linaro.org>
From: Taylor Simpson <tsimpson@quicinc.com>
Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Taylor Simpson <tsimpson@quicinc.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <1617930474-31979-11-git-send-email-tsimpson@quicinc.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
target/hexagon/cpu.c | 5 ++++
target/hexagon/op_helper.c | 47 ----------------------------------
fpu/softfloat-specialize.c.inc | 3 +++
3 files changed, 8 insertions(+), 47 deletions(-)
diff --git a/target/hexagon/cpu.c b/target/hexagon/cpu.c
index f044506d0f..ff44fd6637 100644
--- a/target/hexagon/cpu.c
+++ b/target/hexagon/cpu.c
@@ -23,6 +23,7 @@
#include "exec/exec-all.h"
#include "qapi/error.h"
#include "hw/qdev-properties.h"
+#include "fpu/softfloat-helpers.h"
static void hexagon_v67_cpu_init(Object *obj)
{
@@ -205,8 +206,12 @@ static void hexagon_cpu_reset(DeviceState *dev)
CPUState *cs = CPU(dev);
HexagonCPU *cpu = HEXAGON_CPU(cs);
HexagonCPUClass *mcc = HEXAGON_CPU_GET_CLASS(cpu);
+ CPUHexagonState *env = &cpu->env;
mcc->parent_reset(dev);
+
+ set_default_nan_mode(1, &env->fp_status);
+ set_float_detect_tininess(float_tininess_before_rounding, &env->fp_status);
}
static void hexagon_cpu_disas_set_info(CPUState *s, disassemble_info *info)
diff --git a/target/hexagon/op_helper.c b/target/hexagon/op_helper.c
index 1d91fa2743..478421d147 100644
--- a/target/hexagon/op_helper.c
+++ b/target/hexagon/op_helper.c
@@ -296,26 +296,6 @@ int32_t HELPER(fcircadd)(int32_t RxV, int32_t offset, int32_t M, int32_t CS)
return new_ptr;
}
-/*
- * Hexagon FP operations return ~0 instead of NaN
- * The hex_check_sfnan/hex_check_dfnan functions perform this check
- */
-static float32 hex_check_sfnan(float32 x)
-{
- if (float32_is_any_nan(x)) {
- return make_float32(0xFFFFFFFFU);
- }
- return x;
-}
-
-static float64 hex_check_dfnan(float64 x)
-{
- if (float64_is_any_nan(x)) {
- return make_float64(0xFFFFFFFFFFFFFFFFULL);
- }
- return x;
-}
-
/*
* mem_noshuf
* Section 5.5 of the Hexagon V67 Programmer's Reference Manual
@@ -373,7 +353,6 @@ float64 HELPER(conv_sf2df)(CPUHexagonState *env, float32 RsV)
float64 out_f64;
arch_fpop_start(env);
out_f64 = float32_to_float64(RsV, &env->fp_status);
- out_f64 = hex_check_dfnan(out_f64);
arch_fpop_end(env);
return out_f64;
}
@@ -383,7 +362,6 @@ float32 HELPER(conv_df2sf)(CPUHexagonState *env, float64 RssV)
float32 out_f32;
arch_fpop_start(env);
out_f32 = float64_to_float32(RssV, &env->fp_status);
- out_f32 = hex_check_sfnan(out_f32);
arch_fpop_end(env);
return out_f32;
}
@@ -393,7 +371,6 @@ float32 HELPER(conv_uw2sf)(CPUHexagonState *env, int32_t RsV)
float32 RdV;
arch_fpop_start(env);
RdV = uint32_to_float32(RsV, &env->fp_status);
- RdV = hex_check_sfnan(RdV);
arch_fpop_end(env);
return RdV;
}
@@ -403,7 +380,6 @@ float64 HELPER(conv_uw2df)(CPUHexagonState *env, int32_t RsV)
float64 RddV;
arch_fpop_start(env);
RddV = uint32_to_float64(RsV, &env->fp_status);
- RddV = hex_check_dfnan(RddV);
arch_fpop_end(env);
return RddV;
}
@@ -413,7 +389,6 @@ float32 HELPER(conv_w2sf)(CPUHexagonState *env, int32_t RsV)
float32 RdV;
arch_fpop_start(env);
RdV = int32_to_float32(RsV, &env->fp_status);
- RdV = hex_check_sfnan(RdV);
arch_fpop_end(env);
return RdV;
}
@@ -423,7 +398,6 @@ float64 HELPER(conv_w2df)(CPUHexagonState *env, int32_t RsV)
float64 RddV;
arch_fpop_start(env);
RddV = int32_to_float64(RsV, &env->fp_status);
- RddV = hex_check_dfnan(RddV);
arch_fpop_end(env);
return RddV;
}
@@ -433,7 +407,6 @@ float32 HELPER(conv_ud2sf)(CPUHexagonState *env, int64_t RssV)
float32 RdV;
arch_fpop_start(env);
RdV = uint64_to_float32(RssV, &env->fp_status);
- RdV = hex_check_sfnan(RdV);
arch_fpop_end(env);
return RdV;
}
@@ -443,7 +416,6 @@ float64 HELPER(conv_ud2df)(CPUHexagonState *env, int64_t RssV)
float64 RddV;
arch_fpop_start(env);
RddV = uint64_to_float64(RssV, &env->fp_status);
- RddV = hex_check_dfnan(RddV);
arch_fpop_end(env);
return RddV;
}
@@ -453,7 +425,6 @@ float32 HELPER(conv_d2sf)(CPUHexagonState *env, int64_t RssV)
float32 RdV;
arch_fpop_start(env);
RdV = int64_to_float32(RssV, &env->fp_status);
- RdV = hex_check_sfnan(RdV);
arch_fpop_end(env);
return RdV;
}
@@ -463,7 +434,6 @@ float64 HELPER(conv_d2df)(CPUHexagonState *env, int64_t RssV)
float64 RddV;
arch_fpop_start(env);
RddV = int64_to_float64(RssV, &env->fp_status);
- RddV = hex_check_dfnan(RddV);
arch_fpop_end(env);
return RddV;
}
@@ -625,7 +595,6 @@ float32 HELPER(sfadd)(CPUHexagonState *env, float32 RsV, float32 RtV)
float32 RdV;
arch_fpop_start(env);
RdV = float32_add(RsV, RtV, &env->fp_status);
- RdV = hex_check_sfnan(RdV);
arch_fpop_end(env);
return RdV;
}
@@ -635,7 +604,6 @@ float32 HELPER(sfsub)(CPUHexagonState *env, float32 RsV, float32 RtV)
float32 RdV;
arch_fpop_start(env);
RdV = float32_sub(RsV, RtV, &env->fp_status);
- RdV = hex_check_sfnan(RdV);
arch_fpop_end(env);
return RdV;
}
@@ -687,7 +655,6 @@ float32 HELPER(sfmax)(CPUHexagonState *env, float32 RsV, float32 RtV)
float32 RdV;
arch_fpop_start(env);
RdV = float32_maxnum(RsV, RtV, &env->fp_status);
- RdV = hex_check_sfnan(RdV);
arch_fpop_end(env);
return RdV;
}
@@ -697,7 +664,6 @@ float32 HELPER(sfmin)(CPUHexagonState *env, float32 RsV, float32 RtV)
float32 RdV;
arch_fpop_start(env);
RdV = float32_minnum(RsV, RtV, &env->fp_status);
- RdV = hex_check_sfnan(RdV);
arch_fpop_end(env);
return RdV;
}
@@ -764,7 +730,6 @@ float64 HELPER(dfadd)(CPUHexagonState *env, float64 RssV, float64 RttV)
float64 RddV;
arch_fpop_start(env);
RddV = float64_add(RssV, RttV, &env->fp_status);
- RddV = hex_check_dfnan(RddV);
arch_fpop_end(env);
return RddV;
}
@@ -774,7 +739,6 @@ float64 HELPER(dfsub)(CPUHexagonState *env, float64 RssV, float64 RttV)
float64 RddV;
arch_fpop_start(env);
RddV = float64_sub(RssV, RttV, &env->fp_status);
- RddV = hex_check_dfnan(RddV);
arch_fpop_end(env);
return RddV;
}
@@ -787,7 +751,6 @@ float64 HELPER(dfmax)(CPUHexagonState *env, float64 RssV, float64 RttV)
if (float64_is_any_nan(RssV) || float64_is_any_nan(RttV)) {
float_raise(float_flag_invalid, &env->fp_status);
}
- RddV = hex_check_dfnan(RddV);
arch_fpop_end(env);
return RddV;
}
@@ -800,7 +763,6 @@ float64 HELPER(dfmin)(CPUHexagonState *env, float64 RssV, float64 RttV)
if (float64_is_any_nan(RssV) || float64_is_any_nan(RttV)) {
float_raise(float_flag_invalid, &env->fp_status);
}
- RddV = hex_check_dfnan(RddV);
arch_fpop_end(env);
return RddV;
}
@@ -876,7 +838,6 @@ float32 HELPER(sfmpy)(CPUHexagonState *env, float32 RsV, float32 RtV)
float32 RdV;
arch_fpop_start(env);
RdV = internal_mpyf(RsV, RtV, &env->fp_status);
- RdV = hex_check_sfnan(RdV);
arch_fpop_end(env);
return RdV;
}
@@ -886,7 +847,6 @@ float32 HELPER(sffma)(CPUHexagonState *env, float32 RxV,
{
arch_fpop_start(env);
RxV = internal_fmafx(RsV, RtV, RxV, 0, &env->fp_status);
- RxV = hex_check_sfnan(RxV);
arch_fpop_end(env);
return RxV;
}
@@ -918,7 +878,6 @@ float32 HELPER(sffma_sc)(CPUHexagonState *env, float32 RxV,
RxV = check_nan(RxV, RsV, &env->fp_status);
RxV = check_nan(RxV, RtV, &env->fp_status);
tmp = internal_fmafx(RsV, RtV, RxV, fSXTN(8, 64, PuV), &env->fp_status);
- tmp = hex_check_sfnan(tmp);
if (!(float32_is_zero(RxV) && is_zero_prod(RsV, RtV))) {
RxV = tmp;
}
@@ -933,7 +892,6 @@ float32 HELPER(sffms)(CPUHexagonState *env, float32 RxV,
arch_fpop_start(env);
neg_RsV = float32_sub(float32_zero, RsV, &env->fp_status);
RxV = internal_fmafx(neg_RsV, RtV, RxV, 0, &env->fp_status);
- RxV = hex_check_sfnan(RxV);
arch_fpop_end(env);
return RxV;
}
@@ -964,7 +922,6 @@ float32 HELPER(sffma_lib)(CPUHexagonState *env, float32 RxV,
RxV = check_nan(RxV, RsV, &env->fp_status);
RxV = check_nan(RxV, RtV, &env->fp_status);
tmp = internal_fmafx(RsV, RtV, RxV, 0, &env->fp_status);
- tmp = hex_check_sfnan(tmp);
if (!(float32_is_zero(RxV) && is_zero_prod(RsV, RtV))) {
RxV = tmp;
}
@@ -999,7 +956,6 @@ float32 HELPER(sffms_lib)(CPUHexagonState *env, float32 RxV,
RxV = check_nan(RxV, RtV, &env->fp_status);
float32 minus_RsV = float32_sub(float32_zero, RsV, &env->fp_status);
tmp = internal_fmafx(minus_RsV, RtV, RxV, 0, &env->fp_status);
- tmp = hex_check_sfnan(tmp);
if (!(float32_is_zero(RxV) && is_zero_prod(RsV, RtV))) {
RxV = tmp;
}
@@ -1023,13 +979,11 @@ float64 HELPER(dfmpyfix)(CPUHexagonState *env, float64 RssV, float64 RttV)
float64_is_normal(RttV)) {
RddV = float64_mul(RssV, make_float64(0x4330000000000000),
&env->fp_status);
- RddV = hex_check_dfnan(RddV);
} else if (float64_is_denormal(RttV) &&
(float64_getexp(RssV) >= 512) &&
float64_is_normal(RssV)) {
RddV = float64_mul(RssV, make_float64(0x3cb0000000000000),
&env->fp_status);
- RddV = hex_check_dfnan(RddV);
} else {
RddV = RssV;
}
@@ -1042,7 +996,6 @@ float64 HELPER(dfmpyhh)(CPUHexagonState *env, float64 RxxV,
{
arch_fpop_start(env);
RxxV = internal_mpyhh(RssV, RttV, RxxV, &env->fp_status);
- RxxV = hex_check_dfnan(RxxV);
arch_fpop_end(env);
return RxxV;
}
diff --git a/fpu/softfloat-specialize.c.inc b/fpu/softfloat-specialize.c.inc
index c2f87addb2..9ea318f3e2 100644
--- a/fpu/softfloat-specialize.c.inc
+++ b/fpu/softfloat-specialize.c.inc
@@ -145,6 +145,9 @@ static FloatParts parts_default_nan(float_status *status)
#elif defined(TARGET_HPPA)
/* snan_bit_is_one, set msb-1. */
frac = 1ULL << (DECOMPOSED_BINARY_POINT - 2);
+#elif defined(TARGET_HEXAGON)
+ sign = 1;
+ frac = ~0ULL;
#else
/* This case is true for Alpha, ARM, MIPS, OpenRISC, PPC, RISC-V,
* S390, SH4, TriCore, and Xtensa. I cannot find documentation
--
2.25.1
next prev parent reply other threads:[~2021-05-01 19:01 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-01 18:42 [PULL 00/31] target/hexagon patch queue Richard Henderson
2021-05-01 18:42 ` [PULL 01/31] target/hexagon: translation changes Richard Henderson
2021-05-01 18:42 ` [PULL 02/31] target/hexagon: remove unnecessary checks in find_iclass_slots Richard Henderson
2021-05-01 18:42 ` [PULL 03/31] target/hexagon: Change DECODE_MAPPED_REG operand name to OPNUM Richard Henderson
2021-05-01 18:42 ` [PULL 04/31] target/hexagon: fix typo in comment Richard Henderson
2021-05-01 18:42 ` [PULL 05/31] target/hexagon: remove unnecessary semicolons Richard Henderson
2021-05-01 18:42 ` [PULL 06/31] Hexagon (target/hexagon) TCG generation cleanup Richard Henderson
2021-05-01 18:43 ` [PULL 07/31] Hexagon (target/hexagon) cleanup gen_log_predicated_reg_write_pair Richard Henderson
2021-05-01 18:43 ` [PULL 08/31] Hexagon (target/hexagon) remove unnecessary inline directives Richard Henderson
2021-05-01 18:43 ` [PULL 09/31] Hexagon (target/hexagon) use env_archcpu and env_cpu Richard Henderson
2021-05-01 18:43 ` [PULL 10/31] Hexagon (target/hexagon) properly generate TB end for DISAS_NORETURN Richard Henderson
2021-05-01 18:43 ` [PULL 11/31] Hexagon (target/hexagon) decide if pred has been written at TCG gen time Richard Henderson
2021-05-01 18:43 ` [PULL 12/31] Hexagon (target/hexagon) change variables from int to bool when appropriate Richard Henderson
2021-05-01 18:43 ` [PULL 13/31] Hexagon (target/hexagon) remove unused carry_from_add64 function Richard Henderson
2021-05-01 18:43 ` [PULL 14/31] Hexagon (target/hexagon) change type of softfloat_roundingmodes Richard Henderson
2021-05-01 18:43 ` Richard Henderson [this message]
2021-05-01 18:43 ` [PULL 16/31] Hexagon (target/hexagon) replace float32_mul_pow2 with float32_scalbn Richard Henderson
2021-05-01 18:43 ` [PULL 17/31] Hexagon (target/hexagon) use softfloat for float-to-int conversions Richard Henderson
2021-05-01 18:43 ` [PULL 18/31] Hexagon (target/hexagon) cleanup ternary operators in semantics Richard Henderson
2021-05-01 18:43 ` [PULL 19/31] Hexagon (target/hexagon) cleanup reg_field_info definition Richard Henderson
2021-05-01 18:43 ` [PULL 20/31] Hexagon (target/hexagon) move QEMU_GENERATE to only be on during macros.h Richard Henderson
2021-05-01 18:43 ` [PULL 21/31] Hexagon (target/hexagon) compile all debug code Richard Henderson
2021-05-01 18:43 ` [PULL 22/31] Hexagon (target/hexagon) add F2_sfrecipa instruction Richard Henderson
2021-05-01 18:43 ` [PULL 23/31] Hexagon (target/hexagon) add F2_sfinvsqrta Richard Henderson
2021-05-01 18:43 ` [PULL 24/31] Hexagon (target/hexagon) add A5_ACS (vacsh) Richard Henderson
2021-05-01 18:43 ` [PULL 25/31] Hexagon (target/hexagon) add A6_vminub_RdP Richard Henderson
2021-05-01 18:43 ` [PULL 26/31] Hexagon (target/hexagon) add A4_addp_c/A4_subp_c Richard Henderson
2021-05-01 18:43 ` [PULL 27/31] Hexagon (target/hexagon) circular addressing Richard Henderson
2021-05-01 18:43 ` [PULL 28/31] Hexagon (target/hexagon) bit reverse (brev) addressing Richard Henderson
2021-05-01 18:43 ` [PULL 29/31] Hexagon (target/hexagon) load and unpack bytes instructions Richard Henderson
2021-05-01 18:43 ` [PULL 30/31] Hexagon (target/hexagon) load into shifted register instructions Richard Henderson
2021-05-01 18:43 ` [PULL 31/31] Hexagon (target/hexagon) CABAC decode bin Richard Henderson
2021-05-01 20:40 ` [PULL 00/31] target/hexagon patch queue Peter Maydell
2021-05-01 22:31 ` Richard Henderson
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