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[PM] Schedule InstSimplify after late LICM run, to clean up LCSSA nodes.

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Summary:
The module pass pipeline includes a late LICM run after loop
unrolling.  LCSSA is implicitly run as a pass dependency of LICM.  However no
cleanup pass was run after this, so the LCSSA nodes ended in the optimized output.

Reviewers: hfinkel, mehdi_amini

Subscribers: majnemer, bruno, mzolotukhin, mehdi_amini, llvm-commits

Differential Revision: http://reviews.llvm.org/D20606

llvm-svn: 271602
This commit is contained in:
Manuel Jacob 2016-06-02 22:14:26 +00:00
parent e85b77b60d
commit d6babe096d
2 changed files with 21 additions and 0 deletions
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3
lib/Transforms/IPO/PassManagerBuilder.cpp
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@ -542,6 +542,9 @@ void PassManagerBuilder::populateModulePassManager(
// outer loop. LICM pass can help to promote the runtime check out if the // outer loop. LICM pass can help to promote the runtime check out if the
// checked value is loop invariant. // checked value is loop invariant.
MPM.add(createLICMPass()); MPM.add(createLICMPass());
// Get rid of LCSSA nodes.
MPM.add(createInstructionSimplifierPass());
} }
// After vectorization and unrolling, assume intrinsics may tell us more // After vectorization and unrolling, assume intrinsics may tell us more

18
test/Other/cleanup-lcssa.ll Normal file
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@ -0,0 +1,18 @@
; RUN: opt -S -O3 < %s | FileCheck %s
define i64 @test() {
entry:
br label %loop
loop:
%i = phi i64 [ 0, %entry ], [ %inc, %loop ]
%inc = add i64 %i, 1
%cond = tail call i1 @check()
br i1 %cond, label %loop, label %exit
exit:
; CHECK-NOT: lcssa
ret i64 %i
}
declare i1 @check()