Mesa (master): ac/nir: use ordered float comparisons except for not equal

[Samuel Pitoiset]

Module: Mesa
Branch: master
Commit: e05507a427b79e481eb8e45d7aa3c9b4b78376bf
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=e05507a427b79e481eb8e45d7aa3c9b4b78376bf

Author: Samuel Pitoiset <samuel.pitoiset at gmail.com>
Date:   Fri Feb 23 14:21:06 2018 +0100

ac/nir: use ordered float comparisons except for not equal

Original patch from Timothy Arceri, I have just fixed the
not equal case locally.

This fixes one important rendering issue in Wolfenstein 2
(the cutscene transition issue).

RadeonSI uses the same ordered comparisons, so I guess that
what we should do as well.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=104302
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=104905
Cc: <mesa-stable at lists.freedesktop.org>
Signed-off-by: Samuel Pitoiset <samuel.pitoiset at gmail.com>
Reviewed-by: Marek Olšák <marek.olsak at amd.com>
Reviewed-by: Connor Abbott <cwabbott0 at gmail.com>

---

 src/amd/common/ac_nir_to_llvm.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/amd/common/ac_nir_to_llvm.c b/src/amd/common/ac_nir_to_llvm.c
index 2c5a6e6cf6..8183e48bd3 100644
--- a/src/amd/common/ac_nir_to_llvm.c
+++ b/src/amd/common/ac_nir_to_llvm.c
@@ -1797,16 +1797,16 @@ static void visit_alu(struct ac_nir_context *ctx, const nir_alu_instr *instr)
 		result = emit_int_cmp(&ctx->ac, LLVMIntUGE, src[0], src[1]);
 		break;
 	case nir_op_feq:
-		result = emit_float_cmp(&ctx->ac, LLVMRealUEQ, src[0], src[1]);
+		result = emit_float_cmp(&ctx->ac, LLVMRealOEQ, src[0], src[1]);
 		break;
 	case nir_op_fne:
 		result = emit_float_cmp(&ctx->ac, LLVMRealUNE, src[0], src[1]);
 		break;
 	case nir_op_flt:
-		result = emit_float_cmp(&ctx->ac, LLVMRealULT, src[0], src[1]);
+		result = emit_float_cmp(&ctx->ac, LLVMRealOLT, src[0], src[1]);
 		break;
 	case nir_op_fge:
-		result = emit_float_cmp(&ctx->ac, LLVMRealUGE, src[0], src[1]);
+		result = emit_float_cmp(&ctx->ac, LLVMRealOGE, src[0], src[1]);
 		break;
 	case nir_op_fabs:
 		result = emit_intrin_1f_param(&ctx->ac, "llvm.fabs",