[PATCH] D15573: [X86] Add option for enabling LEA optimization pass

[Andrey Turetskiy via llvm-commits]

aturetsk created this revision.
aturetsk added a reviewer: qcolombet.
aturetsk added a subscriber: llvm-commits.

Add option to enable/disable LEA optimization pass. By default the pass is disabled.

http://reviews.llvm.org/D15573

Files:
  lib/Target/X86/X86OptimizeLEAs.cpp
  test/CodeGen/X86/lea-opt.ll

Index: test/CodeGen/X86/lea-opt.ll
===================================================================
--- test/CodeGen/X86/lea-opt.ll
+++ test/CodeGen/X86/lea-opt.ll
@@ -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 }
Index: lib/Target/X86/X86OptimizeLEAs.cpp
===================================================================
--- lib/Target/X86/X86OptimizeLEAs.cpp
+++ lib/Target/X86/X86OptimizeLEAs.cpp
@@ -33,6 +33,10 @@
 
 #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 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();


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