diff options
author | Sagar Ghuge <sagar.ghuge@intel.com> | 2018-12-05 17:02:42 -0800 |
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committer | Matt Turner <mattst88@gmail.com> | 2019-01-09 16:42:40 -0800 |
commit | d5cf6e92b4f76e55b2b9013b1332ead34881858f (patch) | |
tree | c7cf56188bd72919d02cf3f8ac1f44df94d007d1 | |
parent | b830efb191279e8fba480356c582d41e7f49ee78 (diff) |
glsl: Add "built-in" functions to do uint64_to_fp32(uint64_t)
Reviewed-by: Elie Tournier <tournier.elie@gmail.com>
Signed-off-by: Sagar Ghuge <sagar.ghuge@intel.com>
-rw-r--r-- | src/compiler/glsl/float64.glsl | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/src/compiler/glsl/float64.glsl b/src/compiler/glsl/float64.glsl index e8f6acc3c30..da805131dc3 100644 --- a/src/compiler/glsl/float64.glsl +++ b/src/compiler/glsl/float64.glsl @@ -1100,6 +1100,26 @@ __fp64_to_fp32(uint64_t __a) return __roundAndPackFloat32(aSign, aExp - 0x381, zFrac); } +float +__uint64_to_fp32(uint64_t __a) +{ + uint zFrac = 0u; + uvec2 aFrac = unpackUint2x32(__a); + 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(0u, 0x95 - shiftCount, aFrac.x), 0, is_zero); + } + + shiftCount += 7; + __shift64RightJamming(aFrac.y, aFrac.x, -shiftCount, aFrac.y, aFrac.x); + zFrac = mix(aFrac.x<<shiftCount, aFrac.x, shiftCount < 0); + return __roundAndPackFloat32(0u, 0x9C - shiftCount, zFrac); +} + /* Returns the result of converting the single-precision floating-point value * `a' to the double-precision floating-point format. */ |