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RecursivelyDeleteTriviallyDeadInstructions() could remove
more than 1 instruction. The caller need to be aware of this and adjust instruction iterators accordingly. rdar://16679376 Repaired r207302. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207309 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -127,7 +127,15 @@ bool LoopInstSimplify::runOnLoop(Loop *L, LPPassManager &LPM) {
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++NumSimplified;
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++NumSimplified;
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}
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}
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}
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}
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LocalChanged |= RecursivelyDeleteTriviallyDeadInstructions(I, TLI);
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bool res = RecursivelyDeleteTriviallyDeadInstructions(I, TLI);
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if (res) {
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// RecursivelyDeleteTriviallyDeadInstruction can remove
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// more than one instruction, so simply incrementing the
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// iterator does not work. When instructions get deleted
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// re-iterate instead.
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BI = BB->begin(); BE = BB->end();
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LocalChanged |= res;
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}
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if (IsSubloopHeader && !isa<PHINode>(I))
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if (IsSubloopHeader && !isa<PHINode>(I))
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break;
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break;
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@ -76,7 +76,15 @@ namespace {
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++NumSimplified;
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++NumSimplified;
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Changed = true;
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Changed = true;
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}
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}
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Changed |= RecursivelyDeleteTriviallyDeadInstructions(I, TLI);
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bool res = RecursivelyDeleteTriviallyDeadInstructions(I, TLI);
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if (res) {
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// RecursivelyDeleteTriviallyDeadInstruction can remove
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// more than one instruction, so simply incrementing the
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// iterator does not work. When instructions get deleted
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// re-iterate instead.
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BI = BB->begin(); BE = BB->end();
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Changed |= res;
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}
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}
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}
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// Place the list of instructions to simplify on the next loop iteration
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// Place the list of instructions to simplify on the next loop iteration
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15
test/Transforms/InstSimplify/dead-code-removal.ll
Normal file
15
test/Transforms/InstSimplify/dead-code-removal.ll
Normal file
@ -0,0 +1,15 @@
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; RUN: opt -instsimplify -S < %s | FileCheck %s
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define void @foo() nounwind {
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br i1 undef, label %1, label %4
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; <label>:1 ; preds = %1, %0
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; CHECK-NOT: phi
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; CHECK-NOT: sub
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%2 = phi i32 [ %3, %1 ], [ undef, %0 ]
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%3 = sub i32 0, undef
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br label %1
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; <label>:4 ; preds = %0
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ret void
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}
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