58 lines
1.2 KiB
LLVM
58 lines
1.2 KiB
LLVM
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; RUN: opt -passes=gvn -S < %s | FileCheck %s
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target datalayout = "e-p:64:64:64"
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; GVN should ignore the store to p[1] to see that the load from p[0] is
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; fully redundant.
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; CHECK-LABEL: @yes(
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; CHECK: if.then:
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; CHECK-NEXT: store i32 0, ptr %q
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; CHECK-NEXT: ret void
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define void @yes(i1 %c, ptr %p, ptr %q) nounwind {
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entry:
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store i32 0, ptr %p
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%p1 = getelementptr inbounds i32, ptr %p, i64 1
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store i32 1, ptr %p1
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br i1 %c, label %if.else, label %if.then
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if.then:
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%t = load i32, ptr %p
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store i32 %t, ptr %q
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ret void
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if.else:
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ret void
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}
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; GVN should ignore the store to p[1] to see that the first load from p[0] is
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; fully redundant. However, the second load is larger, so it's not a simple
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; redundancy.
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; CHECK-LABEL: @watch_out_for_size_change(
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; CHECK: if.then:
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; CHECK-NEXT: store i32 0, ptr %q
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; CHECK-NEXT: ret void
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; CHECK: if.else:
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; CHECK: load i64, ptr %p
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; CHECK: store i64
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define void @watch_out_for_size_change(i1 %c, ptr %p, ptr %q) nounwind {
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entry:
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store i32 0, ptr %p
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%p1 = getelementptr inbounds i32, ptr %p, i64 1
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store i32 1, ptr %p1
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br i1 %c, label %if.else, label %if.then
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if.then:
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%t = load i32, ptr %p
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store i32 %t, ptr %q
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ret void
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if.else:
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%t64 = load i64, ptr %p
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store i64 %t64, ptr %q
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ret void
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}
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