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softfloat: Convert floatx80 compare to FloatParts 

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2020-11-21 18:34:39 -08:00
parent 872e6991f0
commit 1b96b006d2
1 changed files with 22 additions and 60 deletions
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82
fpu/softfloat.c
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@ -3862,6 +3862,28 @@ FloatRelation float128_compare_quiet(float128 a, float128 b, float_status *s)
return float128_do_compare(a, b, s, true);
}
static FloatRelation QEMU_FLATTEN
floatx80_do_compare(floatx80 a, floatx80 b, float_status *s, bool is_quiet)
{
FloatParts128 pa, pb;
if (!floatx80_unpack_canonical(&pa, a, s) ||
!floatx80_unpack_canonical(&pb, b, s)) {
return float_relation_unordered;
}
return parts_compare(&pa, &pb, s, is_quiet);
}
FloatRelation floatx80_compare(floatx80 a, floatx80 b, float_status *s)
{
return floatx80_do_compare(a, b, s, false);
}
FloatRelation floatx80_compare_quiet(floatx80 a, floatx80 b, float_status *s)
{
return floatx80_do_compare(a, b, s, true);
}
/*
* Scale by 2**N
*/
@ -5696,66 +5718,6 @@ float128 float128_rem(float128 a, float128 b, float_status *status)
return normalizeRoundAndPackFloat128(aSign ^ zSign, bExp - 4, aSig0, aSig1,
status);
}
static inline FloatRelation
floatx80_compare_internal(floatx80 a, floatx80 b, bool is_quiet,
float_status *status)
{
bool aSign, bSign;
if (floatx80_invalid_encoding(a) || floatx80_invalid_encoding(b)) {
float_raise(float_flag_invalid, status);
return float_relation_unordered;
}
if (( ( extractFloatx80Exp( a ) == 0x7fff ) &&
( extractFloatx80Frac( a )<<1 ) ) ||
( ( extractFloatx80Exp( b ) == 0x7fff ) &&
( extractFloatx80Frac( b )<<1 ) )) {
if (!is_quiet ||
floatx80_is_signaling_nan(a, status) ||
floatx80_is_signaling_nan(b, status)) {
float_raise(float_flag_invalid, status);
}
return float_relation_unordered;
}
aSign = extractFloatx80Sign( a );
bSign = extractFloatx80Sign( b );
if ( aSign != bSign ) {
if ( ( ( (uint16_t) ( ( a.high | b.high ) << 1 ) ) == 0) &&
( ( a.low | b.low ) == 0 ) ) {
/* zero case */
return float_relation_equal;
} else {
return 1 - (2 * aSign);
}
} else {
/* Normalize pseudo-denormals before comparison. */
if ((a.high & 0x7fff) == 0 && a.low & UINT64_C(0x8000000000000000)) {
++a.high;
}
if ((b.high & 0x7fff) == 0 && b.low & UINT64_C(0x8000000000000000)) {
++b.high;
}
if (a.low == b.low && a.high == b.high) {
return float_relation_equal;
} else {
return 1 - 2 * (aSign ^ ( lt128( a.high, a.low, b.high, b.low ) ));
}
}
}
FloatRelation floatx80_compare(floatx80 a, floatx80 b, float_status *status)
{
return floatx80_compare_internal(a, b, 0, status);
}
FloatRelation floatx80_compare_quiet(floatx80 a, floatx80 b,
float_status *status)
{
return floatx80_compare_internal(a, b, 1, status);
}
static void __attribute__((constructor)) softfloat_init(void)
{
union_float64 ua, ub, uc, ur;