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Fix PR8906: -fno-builtin should disable loop-idiom recognition.

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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.

llvm-svn: 122854
This commit is contained in:
Chris Lattner 2011-01-05 01:03:32 +00:00
parent be2382f9a6
commit de8f64f331
1 changed files with 4 additions and 3 deletions
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7
include/llvm/Support/StandardPasses.h
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@ -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