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target/sh4: do not use a helper to implement fneg 

There is no need to use a helper to flip one bit, just use a TCG xor
instruction instead.

Message-Id: <20170702202814.27793-5-aurelien@aurel32.net>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Aurelien Jarno 2017-07-02 18:26:43 +02:00
parent 801f4dac57
commit 82e8251374
3 changed files with 2 additions and 9 deletions
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1
target/sh4/helper.h
View File

@ -32,7 +32,6 @@ DEF_HELPER_FLAGS_2(float_DT, TCG_CALL_NO_WG, f64, env, i32)
DEF_HELPER_FLAGS_4(fmac_FT, TCG_CALL_NO_WG, f32, env, f32, f32, f32)
DEF_HELPER_FLAGS_3(fmul_FT, TCG_CALL_NO_WG, f32, env, f32, f32)
DEF_HELPER_FLAGS_3(fmul_DT, TCG_CALL_NO_WG, f64, env, f64, f64)
DEF_HELPER_FLAGS_1(fneg_T, TCG_CALL_NO_RWG_SE, f32, f32)
DEF_HELPER_FLAGS_3(fsub_FT, TCG_CALL_NO_WG, f32, env, f32, f32)
DEF_HELPER_FLAGS_3(fsub_DT, TCG_CALL_NO_WG, f64, env, f64, f64)
DEF_HELPER_FLAGS_2(fsqrt_FT, TCG_CALL_NO_WG, f32, env, f32)

5
target/sh4/op_helper.c
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@ -384,11 +384,6 @@ float64 helper_fmul_DT(CPUSH4State *env, float64 t0, float64 t1)
return t0;
}
float32 helper_fneg_T(float32 t0)
{
return float32_chs(t0);
}
float32 helper_fsqrt_FT(CPUSH4State *env, float32 t0)
{
set_float_exception_flags(0, &env->fp_status);

5
target/sh4/translate.c
View File

@ -1691,9 +1691,8 @@ static void _decode_opc(DisasContext * ctx)
return;
case 0xf04d: /* fneg FRn/DRn - FPSCR: Nothing */
CHECK_FPU_ENABLED
{
gen_helper_fneg_T(cpu_fregs[FREG(B11_8)], cpu_fregs[FREG(B11_8)]);
}
tcg_gen_xori_i32(cpu_fregs[FREG(B11_8)], cpu_fregs[FREG(B11_8)],
0x80000000);
return;
case 0xf05d: /* fabs FRn/DRn - FPCSR: Nothing */
CHECK_FPU_ENABLED