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fpu/softfloat: Split floatXX_silence_nan from floatXX_maybe_silence_nan

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The new function assumes that the input is an SNaN and
does not double-check.

Tested-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2018-05-10 11:39:48 -07:00
parent bca52234d1
commit d619bb98fd
2 changed files with 123 additions and 56 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

174
fpu/softfloat-specialize.h
View File

@ -271,22 +271,35 @@ int float16_is_signaling_nan(float16 a_, float_status *status)
#endif
}
/*----------------------------------------------------------------------------
| Returns a quiet NaN from a signalling NaN for the half-precision
| floating point value `a'.
*----------------------------------------------------------------------------*/
float16 float16_silence_nan(float16 a, float_status *status)
{
#ifdef NO_SIGNALING_NANS
g_assert_not_reached();
#else
if (status->snan_bit_is_one) {
return float16_default_nan(status);
} else {
return a | (1 << 9);
}
#endif
}
/*----------------------------------------------------------------------------
| Returns a quiet NaN if the half-precision floating point value `a' is a
| signaling NaN; otherwise returns `a'.
*----------------------------------------------------------------------------*/
float16 float16_maybe_silence_nan(float16 a_, float_status *status)
float16 float16_maybe_silence_nan(float16 a, float_status *status)
{
if (float16_is_signaling_nan(a_, status)) {
if (status->snan_bit_is_one) {
return float16_default_nan(status);
} else {
uint16_t a = float16_val(a_);
a |= (1 << 9);
return make_float16(a);
}
if (float16_is_signaling_nan(a, status)) {
return float16_silence_nan(a, status);
}
return a_;
return a;
}
/*----------------------------------------------------------------------------
@ -367,30 +380,40 @@ int float32_is_signaling_nan(float32 a_, float_status *status)
#endif
}
/*----------------------------------------------------------------------------
| Returns a quiet NaN from a signalling NaN for the single-precision
| floating point value `a'.
*----------------------------------------------------------------------------*/
float32 float32_silence_nan(float32 a, float_status *status)
{
#ifdef NO_SIGNALING_NANS
g_assert_not_reached();
#else
if (status->snan_bit_is_one) {
# ifdef TARGET_HPPA
a &= ~0x00400000;
a |= 0x00200000;
return a;
# else
return float32_default_nan(status);
# endif
} else {
return a | (1 << 22);
}
#endif
}
/*----------------------------------------------------------------------------
| Returns a quiet NaN if the single-precision floating point value `a' is a
| signaling NaN; otherwise returns `a'.
*----------------------------------------------------------------------------*/
float32 float32_maybe_silence_nan(float32 a_, float_status *status)
float32 float32_maybe_silence_nan(float32 a, float_status *status)
{
if (float32_is_signaling_nan(a_, status)) {
if (status->snan_bit_is_one) {
#ifdef TARGET_HPPA
uint32_t a = float32_val(a_);
a &= ~0x00400000;
a |= 0x00200000;
return make_float32(a);
#else
return float32_default_nan(status);
#endif
} else {
uint32_t a = float32_val(a_);
a |= (1 << 22);
return make_float32(a);
}
if (float32_is_signaling_nan(a, status)) {
return float32_silence_nan(a, status);
}
return a_;
return a;
}
/*----------------------------------------------------------------------------
@ -776,30 +799,41 @@ int float64_is_signaling_nan(float64 a_, float_status *status)
#endif
}
/*----------------------------------------------------------------------------
| Returns a quiet NaN from a signalling NaN for the double-precision
| floating point value `a'.
*----------------------------------------------------------------------------*/
float64 float64_silence_nan(float64 a, float_status *status)
{
#ifdef NO_SIGNALING_NANS
g_assert_not_reached();
#else
if (status->snan_bit_is_one) {
# ifdef TARGET_HPPA
a &= ~0x0008000000000000ULL;
a |= 0x0004000000000000ULL;
return a;
# else
return float64_default_nan(status);
# endif
} else {
return a | LIT64(0x0008000000000000);
}
#endif
}
/*----------------------------------------------------------------------------
| Returns a quiet NaN if the double-precision floating point value `a' is a
| signaling NaN; otherwise returns `a'.
*----------------------------------------------------------------------------*/
float64 float64_maybe_silence_nan(float64 a_, float_status *status)
float64 float64_maybe_silence_nan(float64 a, float_status *status)
{
if (float64_is_signaling_nan(a_, status)) {
if (status->snan_bit_is_one) {
#ifdef TARGET_HPPA
uint64_t a = float64_val(a_);
a &= ~0x0008000000000000ULL;
a |= 0x0004000000000000ULL;
return make_float64(a);
#else
return float64_default_nan(status);
#endif
} else {
uint64_t a = float64_val(a_);
a |= LIT64(0x0008000000000000);
return make_float64(a);
}
if (float64_is_signaling_nan(a, status)) {
return float64_silence_nan(a, status);
}
return a_;
return a;
}
/*----------------------------------------------------------------------------
@ -937,6 +971,25 @@ int floatx80_is_signaling_nan(floatx80 a, float_status *status)
#endif
}
/*----------------------------------------------------------------------------
| Returns a quiet NaN from a signalling NaN for the extended double-precision
| floating point value `a'.
*----------------------------------------------------------------------------*/
floatx80 floatx80_silence_nan(floatx80 a, float_status *status)
{
#ifdef NO_SIGNALING_NANS
g_assert_not_reached();
#else
if (status->snan_bit_is_one) {
return floatx80_default_nan(status);
} else {
a.low |= LIT64(0xC000000000000000);
return a;
}
#endif
}
/*----------------------------------------------------------------------------
| Returns a quiet NaN if the extended double-precision floating point value
| `a' is a signaling NaN; otherwise returns `a'.
@ -945,12 +998,7 @@ int floatx80_is_signaling_nan(floatx80 a, float_status *status)
floatx80 floatx80_maybe_silence_nan(floatx80 a, float_status *status)
{
if (floatx80_is_signaling_nan(a, status)) {
if (status->snan_bit_is_one) {
a = floatx80_default_nan(status);
} else {
a.low |= LIT64(0xC000000000000000);
return a;
}
return floatx80_silence_nan(a, status);
}
return a;
}
@ -1084,6 +1132,25 @@ int float128_is_signaling_nan(float128 a, float_status *status)
#endif
}
/*----------------------------------------------------------------------------
| Returns a quiet NaN from a signalling NaN for the quadruple-precision
| floating point value `a'.
*----------------------------------------------------------------------------*/
float128 float128_silence_nan(float128 a, float_status *status)
{
#ifdef NO_SIGNALING_NANS
g_assert_not_reached();
#else
if (status->snan_bit_is_one) {
return float128_default_nan(status);
} else {
a.high |= LIT64(0x0000800000000000);
return a;
}
#endif
}
/*----------------------------------------------------------------------------
| Returns a quiet NaN if the quadruple-precision floating point value `a' is
| a signaling NaN; otherwise returns `a'.
@ -1092,12 +1159,7 @@ int float128_is_signaling_nan(float128 a, float_status *status)
float128 float128_maybe_silence_nan(float128 a, float_status *status)
{
if (float128_is_signaling_nan(a, status)) {
if (status->snan_bit_is_one) {
a = float128_default_nan(status);
} else {
a.high |= LIT64(0x0000800000000000);
return a;
}
return float128_silence_nan(a, status);
}
return a;
}

5
include/fpu/softfloat.h
View File

@ -257,6 +257,7 @@ int float16_compare_quiet(float16, float16, float_status *status);
int float16_is_quiet_nan(float16, float_status *status);
int float16_is_signaling_nan(float16, float_status *status);
float16 float16_silence_nan(float16, float_status *status);
float16 float16_maybe_silence_nan(float16, float_status *status);
static inline int float16_is_any_nan(float16 a)
@ -368,6 +369,7 @@ float32 float32_minnummag(float32, float32, float_status *status);
float32 float32_maxnummag(float32, float32, float_status *status);
int float32_is_quiet_nan(float32, float_status *status);
int float32_is_signaling_nan(float32, float_status *status);
float32 float32_silence_nan(float32, float_status *status);
float32 float32_maybe_silence_nan(float32, float_status *status);
float32 float32_scalbn(float32, int, float_status *status);
@ -497,6 +499,7 @@ float64 float64_minnummag(float64, float64, float_status *status);
float64 float64_maxnummag(float64, float64, float_status *status);
int float64_is_quiet_nan(float64 a, float_status *status);
int float64_is_signaling_nan(float64, float_status *status);
float64 float64_silence_nan(float64, float_status *status);
float64 float64_maybe_silence_nan(float64, float_status *status);
float64 float64_scalbn(float64, int, float_status *status);
@ -600,6 +603,7 @@ int floatx80_compare(floatx80, floatx80, float_status *status);
int floatx80_compare_quiet(floatx80, floatx80, float_status *status);
int floatx80_is_quiet_nan(floatx80, float_status *status);
int floatx80_is_signaling_nan(floatx80, float_status *status);
floatx80 floatx80_silence_nan(floatx80, float_status *status);
floatx80 floatx80_maybe_silence_nan(floatx80, float_status *status);
floatx80 floatx80_scalbn(floatx80, int, float_status *status);
@ -811,6 +815,7 @@ int float128_compare(float128, float128, float_status *status);
int float128_compare_quiet(float128, float128, float_status *status);
int float128_is_quiet_nan(float128, float_status *status);
int float128_is_signaling_nan(float128, float_status *status);
float128 float128_silence_nan(float128, float_status *status);
float128 float128_maybe_silence_nan(float128, float_status *status);
float128 float128_scalbn(float128, int, float_status *status);