commit 96b7402bac1ebdccad4f608dc210ae908d010c81
author Reed Kotler <rkotler@mips.com> Mon Mar 10 16:31:25 2014 +0000
committer Reed Kotler <rkotler@mips.com> Mon Mar 10 16:31:25 2014 +0000
tree fb988be1288906ace67c0bfbd4fac248940d36bc
parent 76086c667d792d53988f8351d69efa2890bad2d7

Fix regression with -O0 for mips .

llvm-svn: 203469

llvm/lib/Target/Mips/MipsTargetMachine.cpp

diff --git a/llvm/lib/Target/Mips/MipsTargetMachine.cpp b/llvm/lib/Target/Mips/MipsTargetMachine.cpp
index 3cc1343..e9053c8 100644
--- a/llvm/lib/Target/Mips/MipsTargetMachine.cpp
+++ b/llvm/lib/Target/Mips/MipsTargetMachine.cpp
@@ -175,6 +175,9 @@
   virtual bool addInstSelector();
   virtual void addMachineSSAOptimization();
   virtual bool addPreEmitPass();
+
+  virtual bool addPreRegAlloc();
+
 };
 } // namespace
 
@@ -208,6 +211,15 @@
   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 ");

llvm/test/CodeGen/Mips/optimize-pic-o0.ll

diff --git a/llvm/test/CodeGen/Mips/optimize-pic-o0.ll b/llvm/test/CodeGen/Mips/optimize-pic-o0.ll
new file mode 100644
index 0000000..554d49e
--- /dev/null
+++ b/llvm/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(...)