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Stop explicitly scheduling domfrontier before the loop passes,
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
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@ -117,7 +117,6 @@ namespace llvm {
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PM->add(createArgumentPromotionPass()); // Scalarize uninlined fn args
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// Start of function pass.
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PM->add(createScalarReplAggregatesPass()); // Break up aggregate allocas
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if (SimplifyLibCalls)
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PM->add(createSimplifyLibCallsPass()); // Library Call Optimizations
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@ -129,8 +128,6 @@ namespace llvm {
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PM->add(createTailCallEliminationPass()); // Eliminate tail calls
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PM->add(createCFGSimplificationPass()); // Merge & remove BBs
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PM->add(createReassociatePass()); // Reassociate expressions
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// Explicitly schedule this to ensure that it runs before any loop pass.
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PM->add(new DominanceFrontier()); // Calculate Dominance Frontiers
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PM->add(createLoopRotatePass()); // Rotate Loop
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PM->add(createLICMPass()); // Hoist loop invariants
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PM->add(createLoopUnswitchPass(OptimizeSize || OptimizationLevel < 3));
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