diff options
| -rw-r--r-- | src/compiler/glsl/float64.glsl | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/src/compiler/glsl/float64.glsl b/src/compiler/glsl/float64.glsl index da805131dc3..6a763ffdab0 100644 --- a/src/compiler/glsl/float64.glsl +++ b/src/compiler/glsl/float64.glsl @@ -1120,6 +1120,28 @@ __uint64_to_fp32(uint64_t __a) return __roundAndPackFloat32(0u, 0x9C - shiftCount, zFrac); } +float +__int64_to_fp32(int64_t __a) +{ + uint zFrac = 0u; + uint aSign = uint(__a < 0); + uint64_t absA = mix(uint64_t(__a), uint64_t(-__a), __a < 0); + uvec2 aFrac = unpackUint2x32(absA); + int shiftCount = __countLeadingZeros32(mix(aFrac.y, aFrac.x, aFrac.y == 0u)); + shiftCount -= mix(40, 8, aFrac.y == 0u); + + if (0 <= shiftCount) { + __shortShift64Left(aFrac.y, aFrac.x, shiftCount, aFrac.y, aFrac.x); + bool is_zero = (aFrac.y | aFrac.x) == 0u; + return mix(__packFloat32(aSign, 0x95 - shiftCount, aFrac.x), 0, absA == 0u); + } + + shiftCount += 7; + __shift64RightJamming(aFrac.y, aFrac.x, -shiftCount, aFrac.y, aFrac.x); + zFrac = mix(aFrac.x<<shiftCount, aFrac.x, shiftCount < 0); + return __roundAndPackFloat32(aSign, 0x9C - shiftCount, zFrac); +} + /* Returns the result of converting the single-precision floating-point value * `a' to the double-precision floating-point format. */ |