[PATCH v2 21/24] target/mips: Extract LSA/DLSA translation generators

Philippe Mathieu-Daudé
2020-12-15T23:01:00Z

Extract gen_lsa() from translate.c and explode it as
gen_LSA() and gen_DLSA().

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
target/mips/translate.h | 6 ++++
target/mips/translate.c | 35 +++-----------------
target/mips/translate_addr_const.c | 52 ++++++++++++++++++++++++++++++
target/mips/meson.build | 1 +
4 files changed, 63 insertions(+), 31 deletions(-)
create mode 100644 target/mips/translate_addr_const.c

diff --git a/target/mips/translate.h b/target/mips/translate.h
index 8d84e0c254d..47129de81d9 100644
--- a/target/mips/translate.h
+++ b/target/mips/translate.h
@@ -128,6 +128,12 @@ void gen_load_fpr64(DisasContext *ctx, TCGv_i64 t, int reg);
void gen_store_fpr64(DisasContext *ctx, TCGv_i64 t, int reg);
int get_fp_bit(int cc);

+/*
+ * Address Computation and Large Constant Instructions
+ */
+bool gen_LSA(DisasContext *ctx, int rd, int rt, int rs, int sa);
+bool gen_DLSA(DisasContext *ctx, int rd, int rt, int rs, int sa);
+
extern TCGv cpu_gpr[32], cpu_PC;
extern TCGv_i32 fpu_fcr0, fpu_fcr31;
extern TCGv_i64 fpu_f64[32];
diff --git a/target/mips/translate.c b/target/mips/translate.c
index 2ce3dc10dfb..e0439ba92d8 100644
--- a/target/mips/translate.c
+++ b/target/mips/translate.c
@@ -6616,31 +6616,6 @@ static void gen_bshfl(DisasContext *ctx, uint32_t op2, int rt, int rd)
tcg_temp_free(t0);
}

-static void gen_lsa(DisasContext *ctx, int opc, int rd, int rs, int rt,
- int imm2)
-{
- TCGv t0;
- TCGv t1;
- if (rd == 0) {
- /* Treat as NOP. */
- return;
- }
- t0 = tcg_temp_new();
- t1 = tcg_temp_new();
- gen_load_gpr(t0, rs);
- gen_load_gpr(t1, rt);
- tcg_gen_shli_tl(t0, t0, imm2 + 1);
- tcg_gen_add_tl(cpu_gpr[rd], t0, t1);
- if (opc == OPC_LSA) {
- tcg_gen_ext32s_tl(cpu_gpr[rd], cpu_gpr[rd]);
- }
-
- tcg_temp_free(t1);
- tcg_temp_free(t0);
-
- return;
-}
-
static void gen_align_bits(DisasContext *ctx, int wordsz, int rd, int rs,
int rt, int bits)
{
@@ -16496,8 +16471,7 @@ static void decode_micromips32_opc(CPUMIPSState *env, DisasContext *ctx)
return;
case LSA:
check_insn(ctx, ISA_MIPS32R6);
- gen_lsa(ctx, OPC_LSA, rd, rs, rt,
- extract32(ctx->opcode, 9, 2));
+ gen_LSA(ctx, rd, rs, rt, extract32(ctx->opcode, 9, 2));
break;
case ALIGN:
check_insn(ctx, ISA_MIPS32R6);
@@ -21460,8 +21434,7 @@ static int decode_nanomips_32_48_opc(CPUMIPSState *env, DisasContext *ctx)
* amount, meaning that the supported shift values are in
* the range 0 to 3 (instead of 1 to 4 in MIPSR6).
*/
- gen_lsa(ctx, OPC_LSA, rd, rs, rt,
- extract32(ctx->opcode, 9, 2) - 1);
+ gen_LSA(ctx, rd, rs, rt, extract32(ctx->opcode, 9, 2) - 1);
break;
case NM_EXTW:
gen_ext(ctx, 32, rd, rs, rt, extract32(ctx->opcode, 6, 5));
@@ -24347,7 +24320,7 @@ static void decode_opc_special_r6(CPUMIPSState *env, DisasContext *ctx)
op1 = MASK_SPECIAL(ctx->opcode);
switch (op1) {
case OPC_LSA:
- gen_lsa(ctx, op1, rd, rs, rt, extract32(ctx->opcode, 6, 2));
+ gen_LSA(ctx, rd, rs, rt, extract32(ctx->opcode, 6, 2));
break;
case OPC_MULT:
case OPC_MULTU:
@@ -24401,7 +24374,7 @@ static void decode_opc_special_r6(CPUMIPSState *env, DisasContext *ctx)
#if defined(TARGET_MIPS64)
case OPC_DLSA:
check_mips_64(ctx);
- gen_lsa(ctx, op1, rd, rs, rt, extract32(ctx->opcode, 6, 2));
+ gen_DLSA(ctx, rd, rs, rt, extract32(ctx->opcode, 6, 2));
break;
case R6_OPC_DCLO:
case R6_OPC_DCLZ:
diff --git a/target/mips/translate_addr_const.c b/target/mips/translate_addr_const.c
new file mode 100644
index 00000000000..84662933d49
--- /dev/null
+++ b/target/mips/translate_addr_const.c
@@ -0,0 +1,52 @@
+/*
+ * Address Computation and Large Constant Instructions
+ */
+#include "qemu/osdep.h"
+#include "tcg/tcg-op.h"
+#include "translate.h"
+
+bool gen_LSA(DisasContext *ctx, int rd, int rt, int rs, int sa)
+{
+ TCGv t0;
+ TCGv t1;
+
+ if (rd == 0) {
+ /* Treat as NOP. */
+ return true;
+ }
+ t0 = tcg_temp_new();
+ t1 = tcg_temp_new();
+ gen_load_gpr(t0, rs);
+ gen_load_gpr(t1, rt);
+ tcg_gen_shli_tl(t0, t0, sa + 1);
+ tcg_gen_add_tl(cpu_gpr[rd], t0, t1);
+ tcg_gen_ext32s_tl(cpu_gpr[rd], cpu_gpr[rd]);
+
+ tcg_temp_free(t1);
+ tcg_temp_free(t0);
+
+ return true;
+}
+
+bool gen_DLSA(DisasContext *ctx, int rd, int rt, int rs, int sa)
+{
+ TCGv t0;
+ TCGv t1;
+
+ check_mips_64(ctx);
+
+ if (rd == 0) {
+ /* Treat as NOP. */
+ return true;
+ }
+ t0 = tcg_temp_new();
+ t1 = tcg_temp_new();
+ gen_load_gpr(t0, rs);
+ gen_load_gpr(t1, rt);
+ tcg_gen_shli_tl(t0, t0, sa + 1);
+ tcg_gen_add_tl(cpu_gpr[rd], t0, t1);
+ tcg_temp_free(t1);
+ tcg_temp_free(t0);
+
+ return true;
+}
diff --git a/target/mips/meson.build b/target/mips/meson.build
index 5ccc9ddc6b8..dce0ca96527 100644
--- a/target/mips/meson.build
+++ b/target/mips/meson.build
@@ -16,6 +16,7 @@
'mod-msa_helper.c',
'tlb_helper.c',
'translate.c',
+ 'translate_addr_const.c',
'mod-msa_translate.c',
))
mips_ss.add(when: 'CONFIG_KVM', if_true: files('kvm.c'))
--
2.26.2