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
56 lines
2.8 KiB
LLVM
56 lines
2.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -passes='default<O2>' -S < %s | FileCheck %s
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define void @copy(ptr noalias %to, ptr noalias %from) {
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; CHECK-LABEL: @copy(
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; CHECK-NEXT: [[X:%.*]] = load i32, ptr [[FROM:%.*]], align 4
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; CHECK-NEXT: store i32 [[X]], ptr [[TO:%.*]], align 4
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; CHECK-NEXT: ret void
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;
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%x = load i32, ptr %from
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store i32 %x, ptr %to
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ret void
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}
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; Consider that %addr1 = %addr2 + 1, in which case %addr2i and %addr1i are
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; noalias within one iteration, but may alias across iterations.
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define void @pr39282(ptr %addr1, ptr %addr2) {
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; CHECK-LABEL: @pr39282(
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; CHECK-NEXT: start:
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; CHECK-NEXT: tail call void @llvm.experimental.noalias.scope.decl(metadata [[META0:![0-9]+]])
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; CHECK-NEXT: tail call void @llvm.experimental.noalias.scope.decl(metadata [[META3:![0-9]+]])
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; CHECK-NEXT: [[X_I:%.*]] = load i32, ptr [[ADDR1:%.*]], align 4, !alias.scope [[META3]], !noalias [[META0]]
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; CHECK-NEXT: store i32 [[X_I]], ptr [[ADDR2:%.*]], align 4, !alias.scope [[META0]], !noalias [[META3]]
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; CHECK-NEXT: [[ADDR1I_1:%.*]] = getelementptr inbounds nuw i8, ptr [[ADDR1]], i64 4
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; CHECK-NEXT: [[ADDR2I_1:%.*]] = getelementptr inbounds nuw i8, ptr [[ADDR2]], i64 4
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; CHECK-NEXT: tail call void @llvm.experimental.noalias.scope.decl(metadata [[META5:![0-9]+]])
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; CHECK-NEXT: tail call void @llvm.experimental.noalias.scope.decl(metadata [[META7:![0-9]+]])
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; CHECK-NEXT: [[X_I_1:%.*]] = load i32, ptr [[ADDR1I_1]], align 4, !alias.scope [[META7]], !noalias [[META5]]
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; CHECK-NEXT: store i32 [[X_I_1]], ptr [[ADDR2I_1]], align 4, !alias.scope [[META5]], !noalias [[META7]]
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; CHECK-NEXT: tail call void @llvm.experimental.noalias.scope.decl(metadata [[META9:![0-9]+]])
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; CHECK-NEXT: tail call void @llvm.experimental.noalias.scope.decl(metadata [[META11:![0-9]+]])
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; CHECK-NEXT: [[X_I_2:%.*]] = load i32, ptr [[ADDR1]], align 4, !alias.scope [[META11]], !noalias [[META9]]
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; CHECK-NEXT: store i32 [[X_I_2]], ptr [[ADDR2]], align 4, !alias.scope [[META9]], !noalias [[META11]]
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; CHECK-NEXT: tail call void @llvm.experimental.noalias.scope.decl(metadata [[META13:![0-9]+]])
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; CHECK-NEXT: tail call void @llvm.experimental.noalias.scope.decl(metadata [[META15:![0-9]+]])
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; CHECK-NEXT: [[X_I_3:%.*]] = load i32, ptr [[ADDR1I_1]], align 4, !alias.scope [[META15]], !noalias [[META13]]
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; CHECK-NEXT: store i32 [[X_I_3]], ptr [[ADDR2I_1]], align 4, !alias.scope [[META13]], !noalias [[META15]]
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; CHECK-NEXT: ret void
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;
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start:
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br label %body
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body:
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%i = phi i32 [ 0, %start ], [ %i.next, %body ]
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%j = and i32 %i, 1
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%addr1i = getelementptr inbounds i32, ptr %addr1, i32 %j
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%addr2i = getelementptr inbounds i32, ptr %addr2, i32 %j
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call void @copy(ptr %addr2i, ptr %addr1i)
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%i.next = add i32 %i, 1
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%cmp = icmp slt i32 %i.next, 4
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br i1 %cmp, label %body, label %end
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end:
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ret void
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}
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