Mesa (master): nv50/ir: disable tryCollapseChainedMULs in ConstantFolding for precise instructions

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Module: Mesa
Branch: master
Commit: 30b5c9eda2fe4c335cc15cb921e4f7774af0879e
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=30b5c9eda2fe4c335cc15cb921e4f7774af0879e

Author: Karol Herbst <kherbst at redhat.com>
Date:   Thu Jan 17 23:32:19 2019 +0100

nv50/ir: disable tryCollapseChainedMULs in ConstantFolding for precise instructions

fixes dEQP-GLES2.functional.shaders.invariance.mediump.loop_3

CC: <mesa-stable at lists.freedesktop.org>
Signed-off-by: Karol Herbst <kherbst at redhat.com>
Reviewed-by: Ilia Mirkin <imirkin at alum.mit.edu>

---

 src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp b/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
index 5d3b4aba9c..0b3220903b 100644
--- a/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
+++ b/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
@@ -1045,7 +1045,7 @@ ConstantFolding::opnd(Instruction *i, ImmediateValue &imm0, int s)
       break;
    }
    case OP_MUL:
-      if (i->dType == TYPE_F32)
+      if (i->dType == TYPE_F32 && !i->precise)
          tryCollapseChainedMULs(i, s, imm0);
 
       if (i->subOp == NV50_IR_SUBOP_MUL_HIGH) {