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doing Load PRE" It's not really expected to stick around, last time it provoked a weird LTO build failure that I can't reproduce now, and the bot logs are long gone. I'll re-revert it if the failures recur. Original description: Perform Scalar PRE on gep indices that feed loads before doing Load PRE. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225536 91177308-0d34-0410-b5e6-96231b3b80d8
96 lines
2.2 KiB
LLVM
96 lines
2.2 KiB
LLVM
; RUN: opt -tbaa -basicaa -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 p1 to see that the load from p is
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; fully redundant.
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; CHECK: @yes
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; CHECK: if.then:
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; CHECK-NEXT: store i32 0, i32* %q
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; CHECK-NEXT: ret void
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define void @yes(i1 %c, i32* %p, i32* %p1, i32* %q) nounwind {
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entry:
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store i32 0, i32* %p, !tbaa !1
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store i32 1, i32* %p1, !tbaa !2
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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* %p, !tbaa !1
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store i32 %t, i32* %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 p1 to see that the first load from p is
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; fully redundant. However, the second load uses a different type. Theoretically
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; the other type could be unified with the first type, however for now, GVN
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; should just be conservative.
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; CHECK: @watch_out_for_type_change
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; CHECK: if.then:
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; CHECK: %t = load i32* %p
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; CHECK: store i32 %t, i32* %q
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; CHECK: ret void
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; CHECK: if.else:
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; CHECK: %u = load i32* %p
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; CHECK: store i32 %u, i32* %q
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define void @watch_out_for_type_change(i1 %c, i32* %p, i32* %p1, i32* %q) nounwind {
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entry:
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store i32 0, i32* %p, !tbaa !1
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store i32 1, i32* %p1, !tbaa !2
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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* %p, !tbaa !3
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store i32 %t, i32* %q
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ret void
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if.else:
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%u = load i32* %p, !tbaa !4
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store i32 %u, i32* %q
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ret void
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}
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; As before, but the types are swapped. This time GVN does managed to
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; eliminate one of the loads before noticing the type mismatch.
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; CHECK: @watch_out_for_another_type_change
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; CHECK: if.then:
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; CHECK: store i32 0, i32* %q
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; CHECK: ret void
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; CHECK: if.else:
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; CHECK: %u = load i32* %p
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; CHECK: store i32 %u, i32* %q
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define void @watch_out_for_another_type_change(i1 %c, i32* %p, i32* %p1, i32* %q) nounwind {
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entry:
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store i32 0, i32* %p, !tbaa !1
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store i32 1, i32* %p1, !tbaa !2
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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* %p, !tbaa !4
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store i32 %t, i32* %q
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ret void
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if.else:
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%u = load i32* %p, !tbaa !3
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store i32 %u, i32* %q
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ret void
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}
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!0 = !{}
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!1 = !{!5, !5, i64 0}
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!2 = !{!6, !6, i64 0}
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!3 = !{!7, !7, i64 0}
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!4 = !{!8, !8, i64 0}
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!5 = !{!"red", !0}
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!6 = !{!"blu", !0}
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!7 = !{!"outer space"}
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!8 = !{!"brick red", !5}
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