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[LTO] Discard names for Values that are not global. 

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
This commit is contained in:
Davide Italiano 2016-04-21 04:46:22 +00:00
parent 3e6be4c27a
commit 3c0410d09d
5 changed files with 38 additions and 0 deletions
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1
lld/ELF/Config.h
View File

@ -58,6 +58,7 @@ struct Configuration {
bool Demangle = true;
bool DisableVerify;
bool DiscardAll;
bool DiscardValueNames;
bool DiscardLocals;
bool DiscardNone;
bool EhFrameHdr;

1
lld/ELF/Driver.cpp
View File

@ -289,6 +289,7 @@ void LinkerDriver::readConfigs(opt::InputArgList &Args) {
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);

2
lld/ELF/LTO.h
View File

@ -21,6 +21,7 @@
#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"
@ -41,6 +42,7 @@ public:
BitcodeCompiler()
: Combined(new llvm::Module("ld-temp.o", Context)), Mover(*Combined) {
Context.setDiscardValueNames(Config->DiscardValueNames);
Context.enableDebugTypeODRUniquing();
}

1
lld/ELF/Options.td
View File

@ -238,6 +238,7 @@ def G : Separate<["-"], "G">;
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">;

33
lld/test/ELF/lto/discard-value-names.ll Normal file
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@ -0,0 +1,33 @@
; 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
}