Sets the section names for fixed-size constants and use the mergeable

flag for ELF on x86 so that duplicate constants can be eliminated by
the linker. This matches what GCC does with its -fmerge-constants
option, which is enabled at most -O levels.

llvm-svn: 36666

1 files changed, 5 insertions, 0 deletions

diff --git a/llvm/lib/Target/X86/X86TargetAsmInfo.cpp b/llvm/lib/Target/X86/X86TargetAsmInfo.cpp
index 85ac7a4421e..67196b6f8fe 100644
--- a/llvm/lib/Target/X86/X86TargetAsmInfo.cpp
+++ b/llvm/lib/Target/X86/X86TargetAsmInfo.cpp
@@ -107,6 +107,11 @@ X86TargetAsmInfo::X86TargetAsmInfo(const X86TargetMachine &TM) {
     // HasDotFile - True if target asm supports .file directives.
     // bool HasDotFile; // Defaults to false.
     ReadOnlySection = "\t.section\t.rodata\n";
+    FourByteConstantSection = "\t.section\t.rodata.cst4,\"aM\",@progbits,4";
+    EightByteConstantSection = "\t.section\t.rodata.cst8,\"aM\",@progbits,8";
+    SixteenByteConstantSection =
+                             "\t.section\t.rodata.cst16,\"aM\",@progbits,16";
+    CStringSection = "\t.section\t.rodata.str1.1,\"aMS\",@progbits,1";
     PrivateGlobalPrefix = ".L";
     WeakRefDirective = "\t.weak\t";
     SetDirective = "\t.set\t";