From: Chris Lattner <sabre@nondot.org>
Date: Wed, 5 Jan 2011 01:03:32 +0000 (+0000)
Subject: Fix PR8906: -fno-builtin should disable loop-idiom recognition.
X-Git-Url: http://plrg.eecs.uci.edu/git/?p=oota-llvm.git;a=commitdiff_plain;h=be478819cb23806720aae6a794de543b12602be6

Fix PR8906: -fno-builtin should disable loop-idiom recognition.
It forms memset and memcpy's, and will someday form popcount and
other stuff.  All of this is bad when compiling the implementation
of memset, memcpy, popcount, etc.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122854 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/include/llvm/Support/StandardPasses.h b/include/llvm/Support/StandardPasses.h
index 9372bf299a5..e5c8b7eb7ad 100644
--- a/include/llvm/Support/StandardPasses.h
+++ b/include/llvm/Support/StandardPasses.h
@@ -97,7 +97,7 @@ namespace llvm {
                                                 bool OptimizeSize,
                                                 bool UnitAtATime,
                                                 bool UnrollLoops,
-                                                bool SimplifyLibCalls,
+                                                bool OptimizeBuiltins,
                                                 bool HaveExceptions,
                                                 Pass *InliningPass) {
     createStandardAliasAnalysisPasses(PM);
@@ -130,7 +130,7 @@ namespace llvm {
     // Start of function pass.
     PM->add(createScalarReplAggregatesPass());  // Break up aggregate allocas
     PM->add(createEarlyCSEPass());              // Catch trivial redundancies
-    if (SimplifyLibCalls)
+    if (OptimizeBuiltins)
       PM->add(createSimplifyLibCallsPass());    // Library Call Optimizations
     PM->add(createInstructionCombiningPass());  // Cleanup for scalarrepl.
     PM->add(createJumpThreadingPass());         // Thread jumps.
@@ -146,7 +146,8 @@ namespace llvm {
     PM->add(createLoopUnswitchPass(OptimizeSize || OptimizationLevel < 3));
     PM->add(createInstructionCombiningPass());  
     PM->add(createIndVarSimplifyPass());        // Canonicalize indvars
-    PM->add(createLoopIdiomPass());             // Recognize idioms like memset.
+    if (OptimizeBuiltins)
+      PM->add(createLoopIdiomPass());           // Recognize idioms like memset.
     PM->add(createLoopDeletionPass());          // Delete dead loops
     if (UnrollLoops)
       PM->add(createLoopUnrollPass());          // Unroll small loops