From e1cab9f9f19926559fb4777a4abd7d3af93000c4 Mon Sep 17 00:00:00 2001
From: Reed Kotler <rkotler@mips.com>
Date: Mon, 10 Mar 2014 16:31:25 +0000
Subject: [PATCH] Fix regression with -O0 for mips .

llvm-svn: 203469
---
 lib/Target/Mips/MipsTargetMachine.cpp | 12 ++++++++++
 test/CodeGen/Mips/optimize-pic-o0.ll  | 33 +++++++++++++++++++++++++++
 2 files changed, 45 insertions(+)
 create mode 100644 test/CodeGen/Mips/optimize-pic-o0.ll

diff --git a/lib/Target/Mips/MipsTargetMachine.cpp b/lib/Target/Mips/MipsTargetMachine.cpp
index 3cc1343513b..e9053c87f05 100644
--- a/lib/Target/Mips/MipsTargetMachine.cpp
+++ b/lib/Target/Mips/MipsTargetMachine.cpp
@@ -175,6 +175,9 @@ public:
   virtual bool addInstSelector();
   virtual void addMachineSSAOptimization();
   virtual bool addPreEmitPass();
+
+  virtual bool addPreRegAlloc();
+
 };
 } // namespace
 
@@ -208,6 +211,15 @@ void MipsPassConfig::addMachineSSAOptimization() {
   TargetPassConfig::addMachineSSAOptimization();
 }
 
+bool MipsPassConfig::addPreRegAlloc() {
+  if (getOptLevel() == CodeGenOpt::None) {
+    addPass(createMipsOptimizePICCallPass(getMipsTargetMachine()));
+    return true;
+  }
+  else
+    return false;
+}
+
 void MipsTargetMachine::addAnalysisPasses(PassManagerBase &PM) {
   if (Subtarget.allowMixed16_32()) {
     DEBUG(errs() << "No ");
diff --git a/test/CodeGen/Mips/optimize-pic-o0.ll b/test/CodeGen/Mips/optimize-pic-o0.ll
new file mode 100644
index 00000000000..554d49e728c
--- /dev/null
+++ b/test/CodeGen/Mips/optimize-pic-o0.ll
@@ -0,0 +1,33 @@
+; RUN: llc -mtriple=mipsel -O0 < %s | FileCheck %s
+
+; Function Attrs: nounwind
+define i32 @main()  {
+entry:
+  %retval = alloca i32, align 4
+  %i = alloca i32, align 4
+  store i32 0, i32* %retval
+  store i32 0, i32* %i, align 4
+  br label %for.cond
+
+for.cond:                                         ; preds = %for.inc, %entry
+  %0 = load i32* %i, align 4
+  %cmp = icmp slt i32 %0, 10
+  br i1 %cmp, label %for.body, label %for.end
+
+for.body:                                         ; preds = %for.cond
+  call void bitcast (void (...)* @foo to void ()*)()
+; CHECK: jalr $25
+  br label %for.inc
+
+for.inc:                                          ; preds = %for.body
+  %1 = load i32* %i, align 4
+  %inc = add nsw i32 %1, 1
+  store i32 %inc, i32* %i, align 4
+  br label %for.cond
+
+for.end:                                          ; preds = %for.cond
+  %2 = load i32* %retval
+  ret i32 %2
+}
+
+declare void @foo(...)