This is not on by default (but it might be in the future).
The knob to enable the optimization is -lto-discard-value-names.
llvm-svn: 266953
bool Demangle = true;
bool DisableVerify;
bool DiscardAll;
+ bool DiscardValueNames;
bool DiscardLocals;
bool DiscardNone;
bool EhFrameHdr;
Config->Demangle = !Args.hasArg(OPT_no_demangle);
Config->DisableVerify = Args.hasArg(OPT_disable_verify);
Config->DiscardAll = Args.hasArg(OPT_discard_all);
+ Config->DiscardValueNames = Args.hasArg(OPT_lto_discard_value_names);
Config->DiscardLocals = Args.hasArg(OPT_discard_locals);
Config->DiscardNone = Args.hasArg(OPT_discard_none);
Config->EhFrameHdr = Args.hasArg(OPT_eh_frame_hdr);
#ifndef LLD_ELF_LTO_H
#define LLD_ELF_LTO_H
+#include "Config.h"
#include "lld/Core/LLVM.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringSet.h"
BitcodeCompiler()
: Combined(new llvm::Module("ld-temp.o", Context)), Mover(*Combined) {
+ Context.setDiscardValueNames(Config->DiscardValueNames);
Context.enableDebugTypeODRUniquing();
}
def alias_version_script_version_script : Joined<["--"], "version-script=">, Alias<version_script>;
// LTO-related options.
+def lto_discard_value_names : Flag<["-"], "lto-discard-value-names">;
def lto_jobs : Joined<["--"], "lto-jobs=">,
HelpText<"Number of threads to run codegen">;
def disable_verify : Flag<["-"], "disable-verify">;
--- /dev/null
+; RUN: llvm-as %s -o %t.o
+
+; RUN: ld.lld -m elf_x86_64 -shared -save-temps %t.o -o %t2.o
+; RUN: llvm-dis < %t2.o.lto.bc | FileCheck %s
+
+; RUN: ld.lld -m elf_x86_64 -lto-discard-value-names -shared -save-temps %t.o -o %t2.o
+; RUN: llvm-dis < %t2.o.lto.bc | FileCheck --check-prefix=NONAME %s
+
+; CHECK: @GlobalValueName
+; CHECK: @foo(i32 %in)
+; CHECK: somelabel:
+; CHECK: %GV = load i32, i32* @GlobalValueName
+; CHECK: %add = add i32 %in, %GV
+; CHECK: ret i32 %add
+
+; NONAME: @GlobalValueName
+; NONAME: @foo(i32)
+; NONAME-NOT: somelabel:
+; NONAME: %2 = load i32, i32* @GlobalValueName
+; NONAME: %3 = add i32 %0, %2
+; NONAME: ret i32 %3
+
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+@GlobalValueName = global i32 0
+
+define i32 @foo(i32 %in) {
+somelabel:
+ %GV = load i32, i32* @GlobalValueName
+ %add = add i32 %in, %GV
+ ret i32 %add
+}