Allow the use of an alternate symbol for calculating a function's size.

The standard function epilog includes a .size directive, but ppc64 uses
an alternate local symbol to tag the actual start of each function.

Until recently, binutils accepted the .size directive as:
 .size	test1, .Ltmp0-test1
however, using this directive with recent binutils will result in the error:
 .size expression for XXX does not evaluate to a constant
so we must use the label which actually tags the start of the function.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151200 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 5 insertions, 1 deletions

diff --git a/lib/Target/PowerPC/PPCAsmPrinter.cpp b/lib/Target/PowerPC/PPCAsmPrinter.cpp
index 0380472..505559b 100644
--- a/lib/Target/PowerPC/PPCAsmPrinter.cpp
+++ b/lib/Target/PowerPC/PPCAsmPrinter.cpp
@@ -398,7 +398,11 @@ void PPCLinuxAsmPrinter::EmitFunctionEntryLabel() {
   OutStreamer.EmitRawText("\t.quad .L." + Twine(CurrentFnSym->getName()) +
                           ",.TOC.@tocbase");
   OutStreamer.EmitRawText(StringRef("\t.previous"));
-  OutStreamer.EmitRawText(".L." + Twine(CurrentFnSym->getName()) + ":");
+
+  MCSymbol *RealFnSym = OutContext.GetOrCreateSymbol(
+                          ".L." + Twine(CurrentFnSym->getName()));
+  OutStreamer.EmitLabel(RealFnSym);
+  CurrentFnSymForSize = RealFnSym;
 }