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提交 b10fa3c9 编写于 作者: A aurel32
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target-mips: optimize gen_muldiv() 

Optimize code generation in gen_muldiv():
- Don't do sign extension when the value is already guaranteed to be
  sign extended (otherwise, results are marked as UNPREDICTABLE).
- Access the LO, HI registers directly instead of writting them through
  a temporary variable.
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5681 c046a42c-6fe2-441c-8c8c-71466251a162
上级 507563e8
隐藏空白更改
内联 并排
Showing with 47 addition and 115 deletion
target-mips/translate.c
浏览文件 @ b10fa3c9
......@@ -604,27 +604,7 @@ static inline void gen_store_gpr (TCGv t, int reg)
tcg_gen_mov_tl(cpu_gpr[reg], t);
}
/* Moves to/from HI and LO registers. */
static inline void gen_load_HI (TCGv t, int reg)
{
tcg_gen_mov_tl(t, cpu_HI[reg]);
}
static inline void gen_store_HI (TCGv t, int reg)
{
tcg_gen_mov_tl(cpu_HI[reg], t);
}
static inline void gen_load_LO (TCGv t, int reg)
{
tcg_gen_mov_tl(t, cpu_LO[reg]);
}
static inline void gen_store_LO (TCGv t, int reg)
{
tcg_gen_mov_tl(cpu_LO[reg], t);
}
/* Moves to/from ACX register. */
static inline void gen_load_ACX (TCGv t, int reg)
{
tcg_gen_mov_tl(t, cpu_ACX[reg]);
......@@ -1856,23 +1836,23 @@ static void gen_HILO (DisasContext *ctx, uint32_t opc, int reg)
}
switch (opc) {
case OPC_MFHI:
gen_load_HI(t0, 0);
tcg_gen_mov_tl(t0, cpu_HI[0]);
gen_store_gpr(t0, reg);
opn = "mfhi";
break;
case OPC_MFLO:
gen_load_LO(t0, 0);
tcg_gen_mov_tl(t0, cpu_LO[0]);
gen_store_gpr(t0, reg);
opn = "mflo";
break;
case OPC_MTHI:
gen_load_gpr(t0, reg);
gen_store_HI(t0, 0);
tcg_gen_mov_tl(cpu_HI[0], t0);
opn = "mthi";
break;
case OPC_MTLO:
gen_load_gpr(t0, reg);
gen_store_LO(t0, 0);
tcg_gen_mov_tl(cpu_LO[0], t0);
opn = "mtlo";
break;
default:
......@@ -1899,27 +1879,28 @@ static void gen_muldiv (DisasContext *ctx, uint32_t opc,
{
int l1 = gen_new_label();
tcg_gen_ext32s_tl(t0, t0);
tcg_gen_ext32s_tl(t1, t1);
tcg_gen_brcondi_tl(TCG_COND_EQ, t1, 0, l1);
{
TCGv r_tmp1 = tcg_temp_new(TCG_TYPE_I64);
TCGv r_tmp2 = tcg_temp_new(TCG_TYPE_I64);
TCGv r_tmp3 = tcg_temp_new(TCG_TYPE_I64);
tcg_gen_ext_tl_i64(r_tmp1, t0);
tcg_gen_ext_tl_i64(r_tmp2, t1);
tcg_gen_div_i64(r_tmp3, r_tmp1, r_tmp2);
tcg_gen_rem_i64(r_tmp2, r_tmp1, r_tmp2);
tcg_gen_trunc_i64_tl(t0, r_tmp3);
tcg_gen_trunc_i64_tl(t1, r_tmp2);
int l2 = gen_new_label();
TCGv r_tmp1 = tcg_temp_local_new(TCG_TYPE_I32);
TCGv r_tmp2 = tcg_temp_local_new(TCG_TYPE_I32);
TCGv r_tmp3 = tcg_temp_local_new(TCG_TYPE_I32);
tcg_gen_trunc_tl_i32(r_tmp1, t0);
tcg_gen_trunc_tl_i32(r_tmp2, t1);
tcg_gen_brcondi_i32(TCG_COND_NE, r_tmp1, -1 << 31, l2);
tcg_gen_brcondi_i32(TCG_COND_NE, r_tmp2, -1, l2);
tcg_gen_ext32s_tl(cpu_LO[0], t0);
tcg_gen_movi_tl(cpu_HI[0], 0);
tcg_gen_br(l1);
gen_set_label(l2);
tcg_gen_div_i32(r_tmp3, r_tmp1, r_tmp2);
tcg_gen_rem_i32(r_tmp2, r_tmp1, r_tmp2);
tcg_gen_ext_i32_tl(cpu_LO[0], r_tmp3);
tcg_gen_ext_i32_tl(cpu_HI[0], r_tmp2);
tcg_temp_free(r_tmp1);
tcg_temp_free(r_tmp2);
tcg_temp_free(r_tmp3);
tcg_gen_ext32s_tl(t0, t0);
tcg_gen_ext32s_tl(t1, t1);
gen_store_LO(t0, 0);
gen_store_HI(t1, 0);
}
gen_set_label(l1);
}
......@@ -1940,13 +1921,11 @@ static void gen_muldiv (DisasContext *ctx, uint32_t opc,
tcg_gen_trunc_tl_i32(r_tmp2, t1);
tcg_gen_divu_i32(r_tmp3, r_tmp1, r_tmp2);
tcg_gen_remu_i32(r_tmp1, r_tmp1, r_tmp2);
tcg_gen_ext_i32_tl(t0, r_tmp3);
tcg_gen_ext_i32_tl(t1, r_tmp1);
tcg_gen_ext_i32_tl(cpu_LO[0], r_tmp3);
tcg_gen_ext_i32_tl(cpu_HI[0], r_tmp1);
tcg_temp_free(r_tmp1);
tcg_temp_free(r_tmp2);
tcg_temp_free(r_tmp3);
gen_store_LO(t0, 0);
gen_store_HI(t1, 0);
}
gen_set_label(l1);
}
......@@ -1957,8 +1936,6 @@ static void gen_muldiv (DisasContext *ctx, uint32_t opc,
TCGv r_tmp1 = tcg_temp_new(TCG_TYPE_I64);
TCGv r_tmp2 = tcg_temp_new(TCG_TYPE_I64);
tcg_gen_ext32s_tl(t0, t0);
tcg_gen_ext32s_tl(t1, t1);
tcg_gen_ext_tl_i64(r_tmp1, t0);
tcg_gen_ext_tl_i64(r_tmp2, t1);
tcg_gen_mul_i64(r_tmp1, r_tmp1, r_tmp2);
......@@ -1967,10 +1944,8 @@ static void gen_muldiv (DisasContext *ctx, uint32_t opc,
tcg_gen_shri_i64(r_tmp1, r_tmp1, 32);
tcg_gen_trunc_i64_tl(t1, r_tmp1);
tcg_temp_free(r_tmp1);
tcg_gen_ext32s_tl(t0, t0);
tcg_gen_ext32s_tl(t1, t1);
gen_store_LO(t0, 0);
gen_store_HI(t1, 0);
tcg_gen_ext32s_tl(cpu_LO[0], t0);
tcg_gen_ext32s_tl(cpu_HI[0], t1);
}
opn = "mult";
break;
......@@ -1989,10 +1964,8 @@ static void gen_muldiv (DisasContext *ctx, uint32_t opc,
tcg_gen_shri_i64(r_tmp1, r_tmp1, 32);
tcg_gen_trunc_i64_tl(t1, r_tmp1);
tcg_temp_free(r_tmp1);
tcg_gen_ext32s_tl(t0, t0);
tcg_gen_ext32s_tl(t1, t1);
gen_store_LO(t0, 0);
gen_store_HI(t1, 0);
tcg_gen_ext32s_tl(cpu_LO[0], t0);
tcg_gen_ext32s_tl(cpu_HI[0], t1);
}
opn = "multu";
break;
......@@ -2007,24 +1980,12 @@ static void gen_muldiv (DisasContext *ctx, uint32_t opc,
tcg_gen_brcondi_tl(TCG_COND_NE, t0, -1LL << 63, l2);
tcg_gen_brcondi_tl(TCG_COND_NE, t1, -1LL, l2);
{
tcg_gen_movi_tl(t1, 0);
gen_store_LO(t0, 0);
gen_store_HI(t1, 0);
tcg_gen_br(l1);
}
tcg_gen_mov_tl(cpu_LO[0], t0);
tcg_gen_movi_tl(cpu_HI[0], 0);
tcg_gen_br(l1);
gen_set_label(l2);
{
TCGv r_tmp1 = tcg_temp_new(TCG_TYPE_I64);
TCGv r_tmp2 = tcg_temp_new(TCG_TYPE_I64);
tcg_gen_div_i64(r_tmp1, t0, t1);
tcg_gen_rem_i64(r_tmp2, t0, t1);
gen_store_LO(r_tmp1, 0);
gen_store_HI(r_tmp2, 0);
tcg_temp_free(r_tmp1);
tcg_temp_free(r_tmp2);
}
tcg_gen_div_i64(cpu_LO[0], t0, t1);
tcg_gen_rem_i64(cpu_HI[0], t0, t1);
}
gen_set_label(l1);
}
......@@ -2035,17 +1996,8 @@ static void gen_muldiv (DisasContext *ctx, uint32_t opc,
int l1 = gen_new_label();
tcg_gen_brcondi_tl(TCG_COND_EQ, t1, 0, l1);
{
TCGv r_tmp1 = tcg_temp_new(TCG_TYPE_I64);
TCGv r_tmp2 = tcg_temp_new(TCG_TYPE_I64);
tcg_gen_divu_i64(r_tmp1, t0, t1);
tcg_gen_remu_i64(r_tmp2, t0, t1);
tcg_temp_free(r_tmp1);
tcg_temp_free(r_tmp2);
gen_store_LO(r_tmp1, 0);
gen_store_HI(r_tmp2, 0);
}
tcg_gen_divu_i64(cpu_LO[0], t0, t1);
tcg_gen_remu_i64(cpu_HI[0], t0, t1);
gen_set_label(l1);
}
opn = "ddivu";
......@@ -2064,24 +2016,18 @@ static void gen_muldiv (DisasContext *ctx, uint32_t opc,
TCGv r_tmp1 = tcg_temp_new(TCG_TYPE_I64);
TCGv r_tmp2 = tcg_temp_new(TCG_TYPE_I64);
tcg_gen_ext32s_tl(t0, t0);
tcg_gen_ext32s_tl(t1, t1);
tcg_gen_ext_tl_i64(r_tmp1, t0);
tcg_gen_ext_tl_i64(r_tmp2, t1);
tcg_gen_mul_i64(r_tmp1, r_tmp1, r_tmp2);
gen_load_LO(t0, 0);
gen_load_HI(t1, 0);
tcg_gen_concat_tl_i64(r_tmp2, t0, t1);
tcg_gen_concat_tl_i64(r_tmp2, cpu_LO[0], cpu_HI[0]);
tcg_gen_add_i64(r_tmp1, r_tmp1, r_tmp2);
tcg_temp_free(r_tmp2);
tcg_gen_trunc_i64_tl(t0, r_tmp1);
tcg_gen_shri_i64(r_tmp1, r_tmp1, 32);
tcg_gen_trunc_i64_tl(t1, r_tmp1);
tcg_temp_free(r_tmp1);
tcg_gen_ext32s_tl(t0, t0);
tcg_gen_ext32s_tl(t1, t1);
gen_store_LO(t0, 0);
gen_store_HI(t1, 0);
tcg_gen_ext32s_tl(cpu_LO[0], t0);
tcg_gen_ext32s_tl(cpu_LO[1], t1);
}
opn = "madd";
break;
......@@ -2095,19 +2041,15 @@ static void gen_muldiv (DisasContext *ctx, uint32_t opc,
tcg_gen_extu_tl_i64(r_tmp1, t0);
tcg_gen_extu_tl_i64(r_tmp2, t1);
tcg_gen_mul_i64(r_tmp1, r_tmp1, r_tmp2);
gen_load_LO(t0, 0);
gen_load_HI(t1, 0);
tcg_gen_concat_tl_i64(r_tmp2, t0, t1);
tcg_gen_concat_tl_i64(r_tmp2, cpu_LO[0], cpu_HI[0]);
tcg_gen_add_i64(r_tmp1, r_tmp1, r_tmp2);
tcg_temp_free(r_tmp2);
tcg_gen_trunc_i64_tl(t0, r_tmp1);
tcg_gen_shri_i64(r_tmp1, r_tmp1, 32);
tcg_gen_trunc_i64_tl(t1, r_tmp1);
tcg_temp_free(r_tmp1);
tcg_gen_ext32s_tl(t0, t0);
tcg_gen_ext32s_tl(t1, t1);
gen_store_LO(t0, 0);
gen_store_HI(t1, 0);
tcg_gen_ext32s_tl(cpu_LO[0], t0);
tcg_gen_ext32s_tl(cpu_HI[0], t1);
}
opn = "maddu";
break;
......@@ -2116,24 +2058,18 @@ static void gen_muldiv (DisasContext *ctx, uint32_t opc,
TCGv r_tmp1 = tcg_temp_new(TCG_TYPE_I64);
TCGv r_tmp2 = tcg_temp_new(TCG_TYPE_I64);
tcg_gen_ext32s_tl(t0, t0);
tcg_gen_ext32s_tl(t1, t1);
tcg_gen_ext_tl_i64(r_tmp1, t0);
tcg_gen_ext_tl_i64(r_tmp2, t1);
tcg_gen_mul_i64(r_tmp1, r_tmp1, r_tmp2);
gen_load_LO(t0, 0);
gen_load_HI(t1, 0);
tcg_gen_concat_tl_i64(r_tmp2, t0, t1);
tcg_gen_concat_tl_i64(r_tmp2, cpu_LO[0], cpu_HI[0]);
tcg_gen_sub_i64(r_tmp1, r_tmp1, r_tmp2);
tcg_temp_free(r_tmp2);
tcg_gen_trunc_i64_tl(t0, r_tmp1);
tcg_gen_shri_i64(r_tmp1, r_tmp1, 32);
tcg_gen_trunc_i64_tl(t1, r_tmp1);
tcg_temp_free(r_tmp1);
tcg_gen_ext32s_tl(t0, t0);
tcg_gen_ext32s_tl(t1, t1);
gen_store_LO(t0, 0);
gen_store_HI(t1, 0);
tcg_gen_ext32s_tl(cpu_LO[0], t0);
tcg_gen_ext32s_tl(cpu_HI[0], t1);
}
opn = "msub";
break;
......@@ -2147,19 +2083,15 @@ static void gen_muldiv (DisasContext *ctx, uint32_t opc,
tcg_gen_extu_tl_i64(r_tmp1, t0);
tcg_gen_extu_tl_i64(r_tmp2, t1);
tcg_gen_mul_i64(r_tmp1, r_tmp1, r_tmp2);
gen_load_LO(t0, 0);
gen_load_HI(t1, 0);
tcg_gen_concat_tl_i64(r_tmp2, t0, t1);
tcg_gen_concat_tl_i64(r_tmp2, cpu_LO[0], cpu_HI[0]);
tcg_gen_sub_i64(r_tmp1, r_tmp1, r_tmp2);
tcg_temp_free(r_tmp2);
tcg_gen_trunc_i64_tl(t0, r_tmp1);
tcg_gen_shri_i64(r_tmp1, r_tmp1, 32);
tcg_gen_trunc_i64_tl(t1, r_tmp1);
tcg_temp_free(r_tmp1);
tcg_gen_ext32s_tl(t0, t0);
tcg_gen_ext32s_tl(t1, t1);
gen_store_LO(t0, 0);
gen_store_HI(t1, 0);
tcg_gen_ext32s_tl(cpu_LO[0], t0);
tcg_gen_ext32s_tl(cpu_HI[0], t1);
}
opn = "msubu";
break;
......
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