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Fix f128 NaN check on big-endian hosts

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On big-endian hosts, zig_f128_isNaN() takes the high and low halves
from the wrong element, resulting in buggy NaN detection behavior.
This fixes it.
This commit is contained in:
Koakuma 2021-01-17 23:29:16 +07:00 committed by Andrew Kelley
parent e23bc1f76a
commit 09450419d3
1 changed files with 16 additions and 2 deletions
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18
src/stage1/softfloat.hpp
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@ -12,6 +12,8 @@ extern "C" {
#include "softfloat.h"
}
#include "zigendian.h"
static inline float16_t zig_double_to_f16(double x) {
float64_t y;
static_assert(sizeof(x) == sizeof(y), "");
@ -36,10 +38,22 @@ static inline bool zig_f16_isNaN(float16_t a) {
}
static inline bool zig_f128_isNaN(float128_t *aPtr) {
uint64_t absA64 = aPtr->v[1] & UINT64_C(0x7FFFFFFFFFFFFFFF);
uint64_t hi, lo;
#if defined(ZIG_BYTE_ORDER) && ZIG_BYTE_ORDER == ZIG_LITTLE_ENDIAN
hi = aPtr->v[1];
lo = aPtr->v[0];
#elif defined(ZIG_BYTE_ORDER) && ZIG_BYTE_ORDER == ZIG_BIG_ENDIAN
hi = aPtr->v[0];
lo = aPtr->v[1];
#else
#error Unsupported endian
#endif
uint64_t absA64 = hi & UINT64_C(0x7FFFFFFFFFFFFFFF);
return
(UINT64_C(0x7FFF000000000000) < absA64)
|| ((absA64 == UINT64_C(0x7FFF000000000000)) && aPtr->v[0]);
|| ((absA64 == UINT64_C(0x7FFF000000000000)) && lo);
}
#endif