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[X86] Add option for enabling LEA optimization pass, by Andrey Turetsky

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Add option to enable/disable LEA optimization pass. By default the pass is disabled.
Differential Revision: http://reviews.llvm.org/D15573

llvm-svn: 255881
This commit is contained in:
Alexey Bataev 2015-12-17 07:34:39 +00:00
parent 67d14af686
commit a8fff36021
2 changed files with 6 additions and 2 deletions
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6
lib/Target/X86/X86OptimizeLEAs.cpp
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@ -33,6 +33,10 @@ using namespace llvm;
#define DEBUG_TYPE "x86-optimize-LEAs"
static cl::opt<bool> EnableX86LEAOpt("enable-x86-lea-opt", cl::Hidden,
cl::desc("X86: Enable LEA optimizations."),
cl::init(false));
STATISTIC(NumSubstLEAs, "Number of LEA instruction substitutions");
namespace {
@ -296,7 +300,7 @@ bool OptimizeLEAPass::runOnMachineFunction(MachineFunction &MF) {
bool Changed = false;
// Perform this optimization only if we care about code size.
if (!MF.getFunction()->optForSize())
if (!EnableX86LEAOpt || !MF.getFunction()->optForSize())
return false;
MRI = &MF.getRegInfo();

2
test/CodeGen/X86/lea-opt.ll
View File

@ -1,4 +1,4 @@
; RUN: llc < %s -mtriple=x86_64-linux | FileCheck %s
; RUN: llc < %s -mtriple=x86_64-linux -enable-x86-lea-opt | FileCheck %s
%struct.anon1 = type { i32, i32, i32 }
%struct.anon2 = type { i32, [32 x i32], i32 }