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target-ppc: fix fres, fsqrte and remove useless code 

- fres and fsqrte should not assign a float32 number to a float64 value.
- fre, fres and fsqrte are checking for cases already taken into account
  by softfloat and softfloat native. Remove those useless tests.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6083 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aurel32 2008-12-18 22:42:23 +00:00
parent 1fd31ad763
commit 6c01bf6c7b
1 changed files with 10 additions and 57 deletions
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67
target-ppc/op_helper.c
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@ -563,18 +563,6 @@ static always_inline int isden (float64 d)
return ((u.ll >> 52) & 0x7FF) == 0;
}
#ifdef CONFIG_SOFTFLOAT
static always_inline int isnormal (float64 d)
{
CPU_DoubleU u;
u.d = d;
uint32_t exp = (u.ll >> 52) & 0x7FF;
return ((0 < exp) && (exp < 0x7FF));
}
#endif
uint32_t helper_compute_fprf (uint64_t arg, uint32_t set_fprf)
{
CPU_DoubleU farg;
@ -1528,20 +1516,8 @@ uint64_t helper_fre (uint64_t arg)
} else if (unlikely(float64_is_zero(farg.d))) {
/* Zero reciprocal */
farg.ll = float_zero_divide_excp(fone.d, farg.d);
} else if (likely(isnormal(farg.d))) {
farg.d = float64_div(fone.d, farg.d, &env->fp_status);
} else {
if (farg.ll == 0x8000000000000000ULL) {
farg.ll = 0xFFF0000000000000ULL;
} else if (farg.ll == 0x0000000000000000ULL) {
farg.ll = 0x7FF0000000000000ULL;
} else if (float64_is_nan(farg.d)) {
farg.ll = 0x7FF8000000000000ULL;
} else if (float64_is_neg(farg.d)) {
farg.ll = 0x8000000000000000ULL;
} else {
farg.ll = 0x0000000000000000ULL;
}
farg.d = float64_div(fone.d, farg.d, &env->fp_status);
}
return farg.d;
}
@ -1550,6 +1526,7 @@ uint64_t helper_fre (uint64_t arg)
uint64_t helper_fres (uint64_t arg)
{
CPU_DoubleU fone, farg;
float32 f32;
fone.ll = 0x3FF0000000000000ULL; /* 1.0 */
farg.ll = arg;
@ -1559,25 +1536,10 @@ uint64_t helper_fres (uint64_t arg)
} else if (unlikely(float64_is_zero(farg.d))) {
/* Zero reciprocal */
farg.ll = float_zero_divide_excp(fone.d, farg.d);
} else if (likely(isnormal(farg.d))) {
#if USE_PRECISE_EMULATION
farg.d = float64_div(fone.d, farg.d, &env->fp_status);
farg.d = float64_to_float32(farg.d, &env->fp_status);
#else
farg.d = float32_div(fone.d, farg.d, &env->fp_status);
#endif
} else {
if (farg.ll == 0x8000000000000000ULL) {
farg.ll = 0xFFF0000000000000ULL;
} else if (farg.ll == 0x0000000000000000ULL) {
farg.ll = 0x7FF0000000000000ULL;
} else if (float64_is_nan(farg.d)) {
farg.ll = 0x7FF8000000000000ULL;
} else if (float64_is_neg(farg.d)) {
farg.ll = 0x8000000000000000ULL;
} else {
farg.ll = 0x0000000000000000ULL;
}
farg.d = float64_div(fone.d, farg.d, &env->fp_status);
f32 = float64_to_float32(farg.d, &env->fp_status);
farg.d = float32_to_float64(f32, &env->fp_status);
}
return farg.ll;
}
@ -1586,6 +1548,7 @@ uint64_t helper_fres (uint64_t arg)
uint64_t helper_frsqrte (uint64_t arg)
{
CPU_DoubleU fone, farg;
float32 f32;
fone.ll = 0x3FF0000000000000ULL; /* 1.0 */
farg.ll = arg;
@ -1595,21 +1558,11 @@ uint64_t helper_frsqrte (uint64_t arg)
} else if (unlikely(float64_is_neg(farg.d) && !float64_is_zero(farg.d))) {
/* Reciprocal square root of a negative nonzero number */
farg.ll = fload_invalid_op_excp(POWERPC_EXCP_FP_VXSQRT);
} else if (likely(isnormal(farg.d))) {
farg.d = float64_sqrt(farg.d, &env->fp_status);
farg.d = float32_div(fone.d, farg.d, &env->fp_status);
} else {
if (farg.ll == 0x8000000000000000ULL) {
farg.ll = 0xFFF0000000000000ULL;
} else if (farg.ll == 0x0000000000000000ULL) {
farg.ll = 0x7FF0000000000000ULL;
} else if (float64_is_nan(farg.d)) {
farg.ll |= 0x000FFFFFFFFFFFFFULL;
} else if (float64_is_neg(farg.d)) {
farg.ll = 0x7FF8000000000000ULL;
} else {
farg.ll = 0x0000000000000000ULL;
}
farg.d = float64_sqrt(farg.d, &env->fp_status);
farg.d = float64_div(fone.d, farg.d, &env->fp_status);
f32 = float64_to_float32(farg.d, &env->fp_status);
farg.d = float32_to_float64(f32, &env->fp_status);
}
return farg.ll;
}