[PATCH] R600: Add option to disable promote alloca

[Matt Arsenault]

This can make writing some tests harder, so add a flag to disable it.

http://reviews.llvm.org/D4319

Files:
  lib/Target/R600/AMDGPUTargetMachine.cpp

Index: lib/Target/R600/AMDGPUTargetMachine.cpp
===================================================================
--- lib/Target/R600/AMDGPUTargetMachine.cpp
+++ lib/Target/R600/AMDGPUTargetMachine.cpp
@@ -33,9 +33,13 @@
 #include "llvm/Transforms/Scalar.h"
 #include <llvm/CodeGen/Passes.h>
 
-
 using namespace llvm;
 
+static cl::opt<bool> DisablePromoteAlloca(
+  "disable-amdgpu-promote-alloca",
+  cl::Hidden,
+  cl::desc("Disable Promote Alloca for R600"));
+
 extern "C" void LLVMInitializeR600Target() {
   // Register the target
   RegisterTargetMachine<AMDGPUTargetMachine> X(TheAMDGPUTarget);
@@ -137,8 +141,11 @@
 
 void AMDGPUPassConfig::addCodeGenPrepare() {
   const AMDGPUSubtarget &ST = TM->getSubtarget<AMDGPUSubtarget>();
-  addPass(createAMDGPUPromoteAlloca(ST));
-  addPass(createSROAPass());
+  if (!DisablePromoteAlloca) {
+    addPass(createAMDGPUPromoteAlloca(ST));
+    addPass(createSROAPass());
+  }
+
   TargetPassConfig::addCodeGenPrepare();
 }
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