[llvm] r181072 - Remove some uneeded pseudos in the presence of the naked function attribute.

[Reed Kotler]

Author: rkotler
Date: Fri May  3 18:17:24 2013
New Revision: 181072

URL: http://llvm.org/viewvc/llvm-project?rev=181072&view=rev
Log:
Remove some uneeded pseudos in the presence of the naked function attribute.


Added:
    llvm/trunk/test/CodeGen/Mips/tnaked.ll
Modified:
    llvm/trunk/lib/Target/Mips/MipsAsmPrinter.cpp

Modified: llvm/trunk/lib/Target/Mips/MipsAsmPrinter.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/Mips/MipsAsmPrinter.cpp?rev=181072&r1=181071&r2=181072&view=diff
==============================================================================
--- llvm/trunk/lib/Target/Mips/MipsAsmPrinter.cpp (original)
+++ llvm/trunk/lib/Target/Mips/MipsAsmPrinter.cpp Fri May  3 18:17:24 2013
@@ -249,12 +249,18 @@ void MipsAsmPrinter::EmitFunctionEntryLa
 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"));

Added: llvm/trunk/test/CodeGen/Mips/tnaked.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/Mips/tnaked.ll?rev=181072&view=auto
==============================================================================
--- llvm/trunk/test/CodeGen/Mips/tnaked.ll (added)
+++ llvm/trunk/test/CodeGen/Mips/tnaked.ll Fri May  3 18:17:24 2013
@@ -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" }