28 lines
868 B
LLVM
28 lines
868 B
LLVM
; RUN: opt -codegenprepare -S -mtriple=x86_64-linux < %s | FileCheck %s
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declare void @llvm.assume(i1 noundef) nounwind willreturn
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; Recursively deleting dead operands of assume() may result in its next
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; instruction deleted and the iterator pointing to the next instruction
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; invalidated. This prevents the following simple loop in
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; CodeGenPrepare::optimizeBlock() unless CurInstIterator is fixed:
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;
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; CurInstIterator = BB.begin();
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; while (CurInstIterator != BB.end())
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; optimizeInst(&*CurInstIterator++, ModifiedDT);
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;
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define i32 @test_assume_in_loop(i1 %cond1, i1 %cond2) {
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; CHECK-LABEL: @test_assume_in_loop(
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; CHECK-NEXT: entry:
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entry:
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br label %loop
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; CHECK: loop:
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; CHECK-NEXT: br label %loop
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loop:
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%cond3 = phi i1 [%cond1, %entry], [%cond4, %loop]
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call void @llvm.assume(i1 %cond3)
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%cond4 = icmp ult i1 %cond1, %cond2
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br label %loop
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}
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