forked from OSchip/llvm-project
41 lines
1.4 KiB
LLVM
41 lines
1.4 KiB
LLVM
; RUN: opt -S -licm -o - %s | FileCheck %s
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;
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; Be sure that we don't hoist loads incorrectly if a loop has conditional UB.
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; See PR36228.
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declare void @check(i8)
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declare void @llvm.memcpy.p0i8.p0i8.i64(i8*, i8*, i64, i32, i1)
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; CHECK-LABEL: define void @buggy
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define void @buggy(i8* %src, i1* %kOne) {
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entry:
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%dst = alloca [1 x i8], align 1
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%0 = getelementptr inbounds [1 x i8], [1 x i8]* %dst, i64 0, i64 0
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store i8 42, i8* %0, align 1
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%src16 = bitcast i8* %src to i16*
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%srcval = load i16, i16* %src16
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br label %while.cond
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while.cond: ; preds = %if.end, %entry
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%dp.0 = phi i8* [ %0, %entry ], [ %dp.1, %if.end ]
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%1 = load volatile i1, i1* %kOne, align 4
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br i1 %1, label %if.else, label %if.then
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if.then: ; preds = %while.cond
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store i8 9, i8* %dp.0, align 1
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br label %if.end
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if.else: ; preds = %while.cond
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* %dp.0, i8* %src, i64 2, i32 1, i1 false)
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%dp.new = getelementptr inbounds i8, i8* %dp.0, i64 1
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br label %if.end
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if.end: ; preds = %if.else, %if.then
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%dp.1 = phi i8* [ %dp.0, %if.then ], [ %dp.new, %if.else ]
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; CHECK: %2 = load i8, i8* %0
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%2 = load i8, i8* %0, align 1
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; CHECK-NEXT: call void @check(i8 %2)
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call void @check(i8 %2)
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br label %while.cond
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}
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