462cb3cd6c
If the gep is nusw (usually via inbounds) and the offset is non-negative, we can infer nuw. Proof: https://alive2.llvm.org/ce/z/ihztLy
51 lines
2.3 KiB
LLVM
51 lines
2.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals
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; RUN: opt -passes=instcombine -S < %s | FileCheck %s
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
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declare void @llvm.memcpy.p0.p0.i64(ptr nocapture, ptr nocapture, i64, i1) nounwind
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%struct.T = type { %struct.Wrapper, %struct.Wrapper }
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%struct.Wrapper = type { i16 }
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define void @test1(ptr %a1, ptr %a2) {
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; CHECK-LABEL: @test1(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[B:%.*]] = getelementptr inbounds nuw i8, ptr [[A2:%.*]], i64 2
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; CHECK-NEXT: [[TMP0:%.*]] = load i16, ptr [[A2]], align 2, !tbaa [[TBAA0:![0-9]+]]
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; CHECK-NEXT: store i16 [[TMP0]], ptr [[A1:%.*]], align 2, !tbaa [[TBAA0]]
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; CHECK-NEXT: [[B2:%.*]] = getelementptr inbounds nuw i8, ptr [[A1]], i64 2
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; CHECK-NEXT: [[TMP1:%.*]] = load i16, ptr [[B]], align 2, !tbaa [[TBAA6:![0-9]+]]
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; CHECK-NEXT: store i16 [[TMP1]], ptr [[B2]], align 2, !tbaa [[TBAA6]]
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; CHECK-NEXT: ret void
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;
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entry:
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%b = getelementptr inbounds i8, ptr %a2, i64 2
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call void @llvm.memcpy.p0.p0.i64(ptr align 2 %a1, ptr align 2 %a2, i64 2, i1 false), !tbaa !0, !tbaa.struct !6
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%b2 = getelementptr inbounds %struct.T, ptr %a1, i32 0, i32 1
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call void @llvm.memcpy.p0.p0.i64(ptr align 2 %b2, ptr align 2 %b, i64 2, i1 false), !tbaa !8, !tbaa.struct !6
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ret void
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}
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!0 = !{!1, !4, i64 0, i64 2}
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!1 = !{!2, i64 4, !"_ZTS1T", !4, i64 0, i64 2, !4, i64 2, i64 2}
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!2 = !{!3, i64 1, !"omnipotent char"}
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!3 = !{!"Simple C++ TBAA"}
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!4 = !{!2, i64 2, !"_ZTS7Wrapper", !5, i64 0, i64 2}
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!5 = !{!2, i64 2, !"short"}
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!6 = !{i64 0, i64 2, !7}
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!7 = !{!5, !5, i64 0, i64 2}
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!8 = !{!1, !4, i64 2, i64 2}
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;.
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; CHECK: attributes #[[ATTR0:[0-9]+]] = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
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;.
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; CHECK: [[TBAA0]] = !{[[META1:![0-9]+]], [[META4:![0-9]+]], i64 0, i64 2}
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; CHECK: [[META1]] = !{[[META2:![0-9]+]], i64 4, !"_ZTS1T", [[META4]], i64 0, i64 2, [[META4]], i64 2, i64 2}
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; CHECK: [[META2]] = !{[[META3:![0-9]+]], i64 1, !"omnipotent char"}
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; CHECK: [[META3]] = !{!"Simple C++ TBAA"}
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; CHECK: [[META4]] = !{[[META2]], i64 2, !"_ZTS7Wrapper", [[META5:![0-9]+]], i64 0, i64 2}
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; CHECK: [[META5]] = !{[[META2]], i64 2, !"short"}
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; CHECK: [[TBAA6]] = !{[[META1]], [[META4]], i64 2, i64 2}
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;.
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