From 0f2b10eb0d59c1b02aa63602756abb74f25877ae Mon Sep 17 00:00:00 2001
From: Reed Kotler <rkotler@mips.com>
Date: Fri, 3 May 2013 23:17:24 +0000
Subject: [PATCH] Remove some uneeded pseudos in the presence of the naked
 function attribute.

llvm-svn: 181072
---
 llvm/lib/Target/Mips/MipsAsmPrinter.cpp | 10 +++++++--
 llvm/test/CodeGen/Mips/tnaked.ll        | 29 +++++++++++++++++++++++++
 2 files changed, 37 insertions(+), 2 deletions(-)
 create mode 100644 llvm/test/CodeGen/Mips/tnaked.ll

diff --git a/llvm/lib/Target/Mips/MipsAsmPrinter.cpp b/llvm/lib/Target/Mips/MipsAsmPrinter.cpp
index f4f71cbccb2f..6e4feda4f531 100644
--- a/llvm/lib/Target/Mips/MipsAsmPrinter.cpp
+++ b/llvm/lib/Target/Mips/MipsAsmPrinter.cpp
@@ -249,12 +249,18 @@ void MipsAsmPrinter::EmitFunctionEntryLabel() {
 void MipsAsmPrinter::EmitFunctionBodyStart() {
   MCInstLowering.Initialize(Mang, &MF->getContext());
 
-  emitFrameDirective();
+  bool IsNakedFunction =
+    MF->getFunction()->
+      getAttributes().hasAttribute(AttributeSet::FunctionIndex,
+                                   Attribute::Naked);
+  if (!IsNakedFunction)
+    emitFrameDirective();
 
   if (OutStreamer.hasRawTextSupport()) {
     SmallString<128> Str;
     raw_svector_ostream OS(Str);
-    printSavedRegsBitmask(OS);
+    if (!IsNakedFunction)
+      printSavedRegsBitmask(OS);
     OutStreamer.EmitRawText(OS.str());
     if (!Subtarget->inMips16Mode()) {
       OutStreamer.EmitRawText(StringRef("\t.set\tnoreorder"));
diff --git a/llvm/test/CodeGen/Mips/tnaked.ll b/llvm/test/CodeGen/Mips/tnaked.ll
new file mode 100644
index 000000000000..f5bdd915b28c
--- /dev/null
+++ b/llvm/test/CodeGen/Mips/tnaked.ll
@@ -0,0 +1,29 @@
+; RUN: llc -march=mipsel < %s | FileCheck %s
+
+
+define void @tnaked() #0 {
+entry:
+  ret void
+}
+
+; CHECK: 	.ent	tnaked
+; CHECK:          tnaked: 
+; CHECK-NOT:	.frame	{{.*}}
+; CHECK-NOT:     .mask 	{{.*}}
+; CHECK-NOT:	.fmask	{{.*}}
+; CHECK-NOT:	 addiu	$sp, $sp, -8
+
+define void @tnonaked() #1 {
+entry:
+  ret void
+}
+
+; CHECK: 	.ent	tnonaked
+; CHECK:         tnonaked: 
+; CHECK:	.frame	$fp,8,$ra
+; CHECK:        .mask 	0x40000000,-4
+; CHECK:	.fmask	0x00000000,0
+; CHECK: 	addiu	$sp, $sp, -8
+
+attributes #0 = { naked noinline nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf"="true" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "unsafe-fp-math"="false" "use-soft-float"="false" }
+attributes #1 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf"="true" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "unsafe-fp-math"="false" "use-soft-float"="false" }