10f315dc9c
Infer nuw from nusw and nneg. This is the constant expression variant of https://github.com/llvm/llvm-project/pull/111144. Proof: https://alive2.llvm.org/ce/z/ihztLy
43 lines
1.6 KiB
LLVM
43 lines
1.6 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -passes=indvars -S < %s | FileCheck %s
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; Check the case where one exit has a pointer EC, and the other doesn't.
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; Note that this test case is really really fragile. Removing any
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; instruction in the below causes the result to differ. Note that the lack
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; of a data layout (with pointer size info) is critical to getting a pointer
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; EC returned by SCEV.
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@global = external global [0 x i8], align 1
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define void @foo() {
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; CHECK-LABEL: @foo(
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; CHECK-NEXT: bb:
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; CHECK-NEXT: br label [[BB3:%.*]]
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; CHECK: bb3:
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; CHECK-NEXT: [[TMP6:%.*]] = load i8, ptr getelementptr inbounds nuw (i8, ptr @global, i64 1), align 1
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; CHECK-NEXT: br i1 false, label [[BB7:%.*]], label [[BB11:%.*]]
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; CHECK: bb7:
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; CHECK-NEXT: [[TMP8:%.*]] = zext i8 [[TMP6]] to i64
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; CHECK-NEXT: br i1 true, label [[BB11]], label [[BB3]]
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; CHECK: bb11:
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; CHECK-NEXT: ret void
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;
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bb:
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br label %bb3
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bb3: ; preds = %bb7, %bb2
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%tmp = phi ptr [ %tmp4, %bb7 ], [ getelementptr inbounds ([0 x i8], ptr @global, i64 0, i64 2), %bb ]
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%tmp4 = getelementptr inbounds i8, ptr %tmp, i64 -1
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%tmp6 = load i8, ptr %tmp4, align 1
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%tmp5 = icmp ugt ptr %tmp4, getelementptr inbounds ([0 x i8], ptr @global, i64 0, i64 500)
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br i1 %tmp5, label %bb7, label %bb11
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bb7: ; preds = %bb3
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%tmp8 = zext i8 %tmp6 to i64
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%tmp10 = icmp eq i16 0, 0
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br i1 %tmp10, label %bb11, label %bb3
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bb11: ; preds = %bb7, %bb3
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ret void
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}
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