From 8e1185bd5ccc00576d2a4755f0e5ea8da5abb312 Mon Sep 17 00:00:00 2001 From: Evan Cheng Date: Fri, 19 Jan 2007 18:59:56 +0000 Subject: [PATCH] Modify emission of jump tables on darwin to emit an extra "l" label that delimits the boundaries of jump tables. This lets the linker's dead code stripping optimization do a better job. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33362 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Target/ARM/ARMTargetAsmInfo.cpp | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/lib/Target/ARM/ARMTargetAsmInfo.cpp b/lib/Target/ARM/ARMTargetAsmInfo.cpp index 65848e53765..d70ef6d9013 100644 --- a/lib/Target/ARM/ARMTargetAsmInfo.cpp +++ b/lib/Target/ARM/ARMTargetAsmInfo.cpp @@ -33,6 +33,13 @@ ARMTargetAsmInfo::ARMTargetAsmInfo(const ARMTargetMachine &TM) { LCOMMDirective = "\t.lcomm\t"; COMMDirectiveTakesAlignment = false; + // In non-PIC modes, emit a special label before jump tables so that the + // linker can perform more accurate dead code stripping. + if (TM.getRelocationModel() != Reloc::PIC_) { + // Emit a local label that is preserved until the linker runs. + JumpTableSpecialLabelPrefix = "l"; + } + NeedsSet = true; DwarfAbbrevSection = ".section __DWARF,__debug_abbrev,regular,debug"; DwarfInfoSection = ".section __DWARF,__debug_info,regular,debug"; -- 2.34.1