forked from OSchip/llvm-project
77 lines
1.7 KiB
LLVM
77 lines
1.7 KiB
LLVM
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; RUN: opt -S -sccp < %s | FileCheck %s
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declare void @BB0_f()
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declare void @BB1_f()
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; Make sure we can eliminate what is in BB0 as we know that the indirectbr is going to BB1.
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;
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; CHECK-LABEL: define void @indbrtest1(
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; CHECK-NOT: call void @BB0_f()
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; CHECK: ret void
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define void @indbrtest1() {
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entry:
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indirectbr i8* blockaddress(@indbrtest1, %BB1), [label %BB0, label %BB1]
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BB0:
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call void @BB0_f()
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br label %BB1
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BB1:
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call void @BB1_f()
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ret void
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}
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; Make sure we can eliminate what is in BB0 as we know that the indirectbr is going to BB1
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; by looking through the casts. The casts should be folded away when they are visited
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; before the indirectbr instruction.
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;
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; CHECK-LABEL: define void @indbrtest2(
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; CHECK-NOT: call void @BB0_f()
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; CHECK: ret void
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define void @indbrtest2() {
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entry:
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%a = ptrtoint i8* blockaddress(@indbrtest2, %BB1) to i64
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%b = inttoptr i64 %a to i8*
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%c = bitcast i8* %b to i8*
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indirectbr i8* %b, [label %BB0, label %BB1]
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BB0:
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call void @BB0_f()
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br label %BB1
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BB1:
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call void @BB1_f()
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ret void
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}
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; Make sure we can not eliminate BB0 as we do not know the target of the indirectbr.
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;
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; CHECK-LABEL: define void @indbrtest3(
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; CHECK: call void @BB0_f()
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; CHECK: ret void
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define void @indbrtest3(i8** %Q) {
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entry:
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%t = load i8*, i8** %Q
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indirectbr i8* %t, [label %BB0, label %BB1]
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BB0:
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call void @BB0_f()
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br label %BB1
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BB1:
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call void @BB1_f()
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ret void
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}
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; Make sure we eliminate BB1 as we pick the first successor on undef.
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;
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; CHECK-LABEL: define void @indbrtest4(
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; CHECK: call void @BB0_f()
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; CHECK: ret void
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define void @indbrtest4(i8** %Q) {
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entry:
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indirectbr i8* undef, [label %BB0, label %BB1]
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BB0:
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call void @BB0_f()
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br label %BB1
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BB1:
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call void @BB1_f()
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ret void
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}
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