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target-mips: Unfuse {,N}M{ADD,SUB}.fmt

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Turn MADD.fmt, MSUB.fmt, NMADD.fmt and NMSUB.fmt from fused to unfused
operations, so that they behave in the same way as a separate multiplication
and addition.  The instructions were only fused in early MIPS IV processors.

Signed-off-by: Richard Sandiford <rdsandiford@googlemail.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Richard Sandiford 2013-01-22 17:16:00 +00:00 committed by Aurelien Jarno
parent c728154bbb
commit f54c35d1ea
1 changed files with 17 additions and 8 deletions
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25
target-mips/op_helper.c
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@ -2878,14 +2878,26 @@ FLOAT_BINOP(mul)
FLOAT_BINOP(div)
#undef FLOAT_BINOP
#define UNFUSED_FMA(prefix, a, b, c, flags) \
{ \
a = prefix##_mul(a, b, &env->active_fpu.fp_status); \
if ((flags) & float_muladd_negate_c) { \
a = prefix##_sub(a, c, &env->active_fpu.fp_status); \
} else { \
a = prefix##_add(a, c, &env->active_fpu.fp_status); \
} \
if ((flags) & float_muladd_negate_result) { \
a = prefix##_chs(a); \
} \
}
/* FMA based operations */
#define FLOAT_FMA(name, type) \
uint64_t helper_float_ ## name ## _d(CPUMIPSState *env, \
uint64_t fdt0, uint64_t fdt1, \
uint64_t fdt2) \
{ \
fdt0 = float64_muladd(fdt0, fdt1, fdt2, type, \
&env->active_fpu.fp_status); \
UNFUSED_FMA(float64, fdt0, fdt1, fdt2, type); \
update_fcr31(env, GETPC()); \
return fdt0; \
} \
@ -2894,8 +2906,7 @@ uint32_t helper_float_ ## name ## _s(CPUMIPSState *env, \
uint32_t fst0, uint32_t fst1, \
uint32_t fst2) \
{ \
fst0 = float32_muladd(fst0, fst1, fst2, type, \
&env->active_fpu.fp_status); \
UNFUSED_FMA(float32, fst0, fst1, fst2, type); \
update_fcr31(env, GETPC()); \
return fst0; \
} \
@ -2911,10 +2922,8 @@ uint64_t helper_float_ ## name ## _ps(CPUMIPSState *env, \
uint32_t fst2 = fdt2 & 0XFFFFFFFF; \
uint32_t fsth2 = fdt2 >> 32; \
\
fst0 = float32_muladd(fst0, fst1, fst2, type, \
&env->active_fpu.fp_status); \
fsth0 = float32_muladd(fsth0, fsth1, fsth2, type, \
&env->active_fpu.fp_status); \
UNFUSED_FMA(float32, fst0, fst1, fst2, type); \
UNFUSED_FMA(float32, fsth0, fsth1, fsth2, type); \
update_fcr31(env, GETPC()); \
return ((uint64_t)fsth0 << 32) | fst0; \
}