From c9d333a6b76e27bda48efee35da53afba2dc191c Mon Sep 17 00:00:00 2001
From: Sagar Ghuge <sagar.ghuge@intel.com>
Date: Wed, 5 Dec 2018 22:37:18 -0800
Subject: [PATCH] glsl: Add "built-in" functions to do int64_to_fp32(int64_t)

Reviewed-by: Elie Tournier <tournier.elie@gmail.com>
Signed-off-by: Sagar Ghuge <sagar.ghuge@intel.com>
---
 src/compiler/glsl/float64.glsl | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

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.
  */
-- 
2.30.2