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Stop explicitly scheduling domfrontier before the loop passes,

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since none of them use it.  With this, we now only run 
domfrontier (an N^2 analysis) 3 times at clang -O3: once for 
"early" per-function cleanup, once at the start of the
per-function pipeline to support SRoA, and once late because
the EHPrepare class uses it.

EHPrepare needs to stop using it, this is silly and wasteful.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112420 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-08-29 07:05:51 +00:00
parent e418ac832c
commit 8bfc4299c2
1 changed files with 0 additions and 3 deletions
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3
include/llvm/Support/StandardPasses.h
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@ -117,7 +117,6 @@ namespace llvm {
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
@ -129,8 +128,6 @@ namespace llvm {
PM->add(createTailCallEliminationPass()); // Eliminate tail calls
PM->add(createCFGSimplificationPass()); // Merge & remove BBs
PM->add(createReassociatePass()); // Reassociate expressions
// Explicitly schedule this to ensure that it runs before any loop pass.
PM->add(new DominanceFrontier()); // Calculate Dominance Frontiers
PM->add(createLoopRotatePass()); // Rotate Loop
PM->add(createLICMPass()); // Hoist loop invariants
PM->add(createLoopUnswitchPass(OptimizeSize || OptimizationLevel < 3));