From: Elie Tournier <tournier.elie@gmail.com>
Date: Tue, 8 Aug 2017 13:12:35 +0000 (+0100)
Subject: glsl: Add "built-in" function to do sign(fp64)
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=c802cdde9df1295fe0d6d6a3dbf4151f46070d19;p=mesa.git

glsl: Add "built-in" function to do sign(fp64)

v2: use mix.

Signed-off-by: Elie Tournier <elie.tournier@collabora.com>
---

diff --git a/src/compiler/glsl/float64.glsl b/src/compiler/glsl/float64.glsl
index 5f873319b42..31aae3fca22 100644
--- a/src/compiler/glsl/float64.glsl
+++ b/src/compiler/glsl/float64.glsl
@@ -93,3 +93,13 @@ __fneg64(uint64_t __a)
    a.y = mix(t, a.y, __is_nan(__a));
    return packUint2x32(a);
 }
+
+uint64_t
+__fsign64(uint64_t __a)
+{
+   uvec2 a = unpackUint2x32(__a);
+   uvec2 retval;
+   retval.x = 0u;
+   retval.y = mix((a.y & 0x80000000u) | 0x3FF00000u, 0u, (a.y << 1 | a.x) == 0u);
+   return packUint2x32(retval);
+}