From: Karol Herbst <karolherbst@gmail.com>
Date: Fri, 23 Jun 2017 18:30:26 +0000 (+0200)
Subject: st/glsl_to_tgsi: don't optimize mul+add to mad if expression is precise
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=4ad9e2e17a8019b383d3664ca39ae3227aa3776d;p=mesa.git

st/glsl_to_tgsi: don't optimize mul+add to mad if expression is precise

Signed-off-by: Karol Herbst <karolherbst@gmail.com>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
---

diff --git a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
index c8f40c147d8..baa835924bc 100644
--- a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
+++ b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
@@ -1557,7 +1557,7 @@ glsl_to_tgsi_visitor::visit(ir_expression *ir)
 
    /* Quick peephole: Emit MAD(a, b, c) instead of ADD(MUL(a, b), c)
     */
-   if (ir->operation == ir_binop_add) {
+   if (!this->precise && ir->operation == ir_binop_add) {
       if (try_emit_mad(ir, 1))
          return;
       if (try_emit_mad(ir, 0))