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fix two strange things in the default passmgr:

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1. we'd run simplifycfg at the very start, even though
the per function passes have already cleaned this up.

2. In the main per-function pipeline that is interlaced with inlining 
   etc, we would do instcombine, jump threading, simplifycfg *before*
   doing SROA.  SROA is much more likely to expose opportunities for
   these passes than they are for SROA, so move SRoA up earlier.

also add some comments.

llvm-svn: 85742
This commit is contained in:
Chris Lattner 2009-11-01 20:41:59 +00:00
parent 326adfb172
commit dc9cf48396
1 changed files with 8 additions and 2 deletions
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10
include/llvm/Support/StandardPasses.h
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@ -96,7 +96,6 @@ namespace llvm {
return;
}
PM->add(createCFGSimplificationPass()); // Clean up disgusting code
if (UnitAtATime) {
PM->add(createGlobalOptimizerPass()); // Optimize out global vars
@ -106,6 +105,8 @@ namespace llvm {
}
PM->add(createInstructionCombiningPass()); // Clean up after IPCP & DAE
PM->add(createCFGSimplificationPass()); // Clean up after IPCP & DAE
// Start of CallGraph SCC passes.
if (UnitAtATime) {
if (HaveExceptions)
PM->add(createPruneEHPass()); // Remove dead EH info
@ -115,13 +116,18 @@ namespace llvm {
PM->add(InliningPass);
if (OptimizationLevel > 2)
PM->add(createArgumentPromotionPass()); // Scalarize uninlined fn args
// Start of function pass.
PM->add(createScalarReplAggregatesPass()); // Break up aggregate allocas
if (SimplifyLibCalls)
PM->add(createSimplifyLibCallsPass()); // Library Call Optimizations
PM->add(createInstructionCombiningPass()); // Cleanup for scalarrepl.
PM->add(createJumpThreadingPass()); // Thread jumps.
PM->add(createCFGSimplificationPass()); // Merge & remove BBs
PM->add(createScalarReplAggregatesPass()); // Break up aggregate allocas
PM->add(createInstructionCombiningPass()); // Combine silly seq's
// FIXME: CondProp breaks critical edges, which is slow.
PM->add(createCondPropagationPass()); // Propagate conditionals
PM->add(createTailCallEliminationPass()); // Eliminate tail calls
PM->add(createCFGSimplificationPass()); // Merge & remove BBs