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| author | Koakuma <koachan@protonmail.com> | 2021-01-17 23:29:16 +0700 |
|---|---|---|
| committer | Andrew Kelley <andrew@ziglang.org> | 2021-01-25 10:40:23 -0800 |
| commit | 09450419d3bfe990b4e34f85f673615ae601b0d3 (patch) | |
| tree | 325e78a380786bcdf125a7dd23436f0ca4e8fc1a /src | |
| parent | e23bc1f76af298e7ba0140e442858c1faa98e379 (diff) | |
| download | zig-09450419d3bfe990b4e34f85f673615ae601b0d3.tar.gz zig-09450419d3bfe990b4e34f85f673615ae601b0d3.zip | |
Fix f128 NaN check on big-endian hosts
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.
Diffstat (limited to 'src')
| -rw-r--r-- | src/stage1/softfloat.hpp | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/src/stage1/softfloat.hpp b/src/stage1/softfloat.hpp index 57e60a5fc0..0d43292c4d 100644 --- a/src/stage1/softfloat.hpp +++ b/src/stage1/softfloat.hpp @@ -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 |