Mesa (master): nv50/ir: the mad source might not have a defining instruction

[Ilia Mirkin]

Module: Mesa
Branch: master
Commit: 11fcf46590129abfa2ca2117a320e8a8052761e4
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=11fcf46590129abfa2ca2117a320e8a8052761e4

Author: Ilia Mirkin <imirkin at alum.mit.edu>
Date:   Wed Dec  2 20:10:54 2015 -0500

nv50/ir: the mad source might not have a defining instruction

For example if it's $r63 (aka 0), there won't be a definition.

Signed-off-by: Ilia Mirkin <imirkin at alum.mit.edu>
Cc: "11.0 11.1" <mesa-stable at lists.freedesktop.org>

---

 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 9c42e4a..0f3caa8 100644
--- a/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
+++ b/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
@@ -2660,7 +2660,7 @@ NV50PostRaConstantFolding::visit(BasicBlock *bb)
             break;
 
          def = i->getSrc(1)->getInsn();
-         if (def->op == OP_MOV && def->src(0).getFile() == FILE_IMMEDIATE) {
+         if (def && def->op == OP_MOV && def->src(0).getFile() == FILE_IMMEDIATE) {
             vtmp = i->getSrc(1);
             i->setSrc(1, def->getSrc(0));