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| author | Aurelien Jarno <aurelien@aurel32.net> | 2011-01-13 08:20:39 +0100 |
|---|---|---|
| committer | Aurelien Jarno <aurelien@aurel32.net> | 2011-01-16 13:19:20 +0100 |
| commit | b2d9eda5d473fa7251319a368b0ee72d75218aed (patch) | |
| tree | 72f57871efe63fd03f00ffcde050b1475a37fa39 /target-sh4 | |
| parent | 2411fde9a41323310d472dd352006989f30049b2 (diff) | |
| download | qemu-b2d9eda5d473fa7251319a368b0ee72d75218aed.zip qemu-b2d9eda5d473fa7251319a368b0ee72d75218aed.tar.gz qemu-b2d9eda5d473fa7251319a368b0ee72d75218aed.tar.bz2 | |
target-sh4: implement negc using TCG
Using setcond it's now possible to generate a relatively short negc
instruction in TCG.
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Diffstat (limited to 'target-sh4')
| -rw-r--r-- | target-sh4/helper.h | 1 | ||||
| -rw-r--r-- | target-sh4/op_helper.c | 15 | ||||
| -rw-r--r-- | target-sh4/translate.c | 16 |
3 files changed, 15 insertions, 17 deletions
diff --git a/target-sh4/helper.h b/target-sh4/helper.h index 4e595c8..2e52768 100644 --- a/target-sh4/helper.h +++ b/target-sh4/helper.h @@ -17,7 +17,6 @@ DEF_HELPER_2(addv, i32, i32, i32) DEF_HELPER_2(addc, i32, i32, i32) DEF_HELPER_2(subv, i32, i32, i32) DEF_HELPER_2(subc, i32, i32, i32) -DEF_HELPER_1(negc, i32, i32) DEF_HELPER_2(div1, i32, i32, i32) DEF_HELPER_2(macl, void, i32, i32) DEF_HELPER_2(macw, void, i32, i32) diff --git a/target-sh4/op_helper.c b/target-sh4/op_helper.c index 9d7652f..30f9842 100644 --- a/target-sh4/op_helper.c +++ b/target-sh4/op_helper.c @@ -379,21 +379,6 @@ void helper_macw(uint32_t arg0, uint32_t arg1) } } -uint32_t helper_negc(uint32_t arg) -{ - uint32_t temp; - - temp = -arg; - arg = temp - (env->sr & SR_T); - if (0 < temp) - env->sr |= SR_T; - else - env->sr &= ~SR_T; - if (temp < arg) - env->sr |= SR_T; - return arg; -} - uint32_t helper_subc(uint32_t arg0, uint32_t arg1) { uint32_t tmp0, tmp1; diff --git a/target-sh4/translate.c b/target-sh4/translate.c index 743d76a..35573be 100644 --- a/target-sh4/translate.c +++ b/target-sh4/translate.c @@ -952,7 +952,21 @@ static void _decode_opc(DisasContext * ctx) tcg_gen_neg_i32(REG(B11_8), REG(B7_4)); return; case 0x600a: /* negc Rm,Rn */ - gen_helper_negc(REG(B11_8), REG(B7_4)); + { + TCGv t0, t1; + t0 = tcg_temp_new(); + tcg_gen_neg_i32(t0, REG(B7_4)); + t1 = tcg_temp_new(); + tcg_gen_andi_i32(t1, cpu_sr, SR_T); + tcg_gen_sub_i32(REG(B11_8), t0, t1); + tcg_gen_andi_i32(cpu_sr, cpu_sr, ~SR_T); + tcg_gen_setcond_i32(TCG_COND_GE, t1, REG(B11_8), t0); + tcg_gen_or_i32(cpu_sr, cpu_sr, t1); + tcg_gen_setcondi_i32(TCG_COND_GE, t1, t0, 0); + tcg_gen_or_i32(cpu_sr, cpu_sr, t1); + tcg_temp_free(t0); + tcg_temp_free(t1); + } return; case 0x6007: /* not Rm,Rn */ tcg_gen_not_i32(REG(B11_8), REG(B7_4)); |