[Mesa-dev] [PATCH] spirv: Implement IsInf using an integer comparison

[Jason Ekstrand]

Since we already do fabs on the one source, we're guaranteed to get
positive infinity if we get any infinity at all.  Since +inf only has
one IEEE 754 representation, we can use an integer comparison and avoid
all of the ordered/unordered issues.

Cc: Dave Airlie <airlied at redhat.com>
---
 src/compiler/spirv/vtn_alu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/compiler/spirv/vtn_alu.c b/src/compiler/spirv/vtn_alu.c
index 0738fe0..9e4beed 100644
--- a/src/compiler/spirv/vtn_alu.c
+++ b/src/compiler/spirv/vtn_alu.c
@@ -447,7 +447,7 @@ vtn_handle_alu(struct vtn_builder *b, SpvOp opcode,
       break;
 
    case SpvOpIsInf:
-      val->ssa->def = nir_feq(&b->nb, nir_fabs(&b->nb, src[0]),
+      val->ssa->def = nir_ieq(&b->nb, nir_fabs(&b->nb, src[0]),
                                       nir_imm_float(&b->nb, INFINITY));
       break;
 
-- 
2.5.0.400.gff86faf