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76b232f00a
This is a fix for https://bugs.llvm.org/show_bug.cgi?id=39282. Compared to D90104, this version is based on part of the full restrict patched (D68484) and uses the `@llvm.experimental.noalias.scope.decl` intrinsic to track the location where !noalias and !alias.scope scopes have been introduced. This allows us to only duplicate the scopes that are really needed. Notes: - it also includes changes and tests from D90104 Reviewed By: nikic Differential Revision: https://reviews.llvm.org/D92887
57 lines
2.5 KiB
LLVM
57 lines
2.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -O2 -S < %s -enable-new-pm=0 | FileCheck %s
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; RUN: opt -passes='default<O2>' -S < %s | FileCheck %s
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define void @copy(i32* noalias %to, i32* noalias %from) {
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; CHECK-LABEL: @copy(
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; CHECK-NEXT: [[X:%.*]] = load i32, i32* [[FROM:%.*]], align 4
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; CHECK-NEXT: store i32 [[X]], i32* [[TO:%.*]], align 4
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; CHECK-NEXT: ret void
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;
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%x = load i32, i32* %from
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store i32 %x, i32* %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(i32* %addr1, i32* %addr2) {
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; CHECK-LABEL: @pr39282(
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; CHECK-NEXT: start:
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; CHECK-NEXT: call void @llvm.experimental.noalias.scope.decl
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; CHECK-NEXT: call void @llvm.experimental.noalias.scope.decl
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; CHECK-NEXT: [[X_I:%.*]] = load i32, i32* [[ADDR1:%.*]], align 4, !alias.scope !3, !noalias !0
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; CHECK-NEXT: store i32 [[X_I]], i32* [[ADDR2:%.*]], align 4, !alias.scope !0, !noalias !3
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; CHECK-NEXT: [[ADDR1I_1:%.*]] = getelementptr inbounds i32, i32* [[ADDR1]], i64 1
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; CHECK-NEXT: [[ADDR2I_1:%.*]] = getelementptr inbounds i32, i32* [[ADDR2]], i64 1
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; CHECK-NEXT: call void @llvm.experimental.noalias.scope.decl
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; CHECK-NEXT: call void @llvm.experimental.noalias.scope.decl
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; CHECK-NEXT: [[X_I_1:%.*]] = load i32, i32* [[ADDR1I_1]], align 4, !alias.scope !7, !noalias !5
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; CHECK-NEXT: store i32 [[X_I_1]], i32* [[ADDR2I_1]], align 4, !alias.scope !5, !noalias !7
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; CHECK-NEXT: call void @llvm.experimental.noalias.scope.decl
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; CHECK-NEXT: call void @llvm.experimental.noalias.scope.decl
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; CHECK-NEXT: [[X_I_2:%.*]] = load i32, i32* [[ADDR1]], align 4, !alias.scope !11, !noalias !9
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; CHECK-NEXT: store i32 [[X_I_2]], i32* [[ADDR2]], align 4, !alias.scope !9, !noalias !11
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; CHECK-NEXT: call void @llvm.experimental.noalias.scope.decl
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; CHECK-NEXT: call void @llvm.experimental.noalias.scope.decl
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; CHECK-NEXT: [[X_I_3:%.*]] = load i32, i32* [[ADDR1I_1]], align 4, !alias.scope !15, !noalias !13
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; CHECK-NEXT: store i32 [[X_I_3]], i32* [[ADDR2I_1]], align 4, !alias.scope !13, !noalias !15
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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, i32* %addr1, i32 %j
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%addr2i = getelementptr inbounds i32, i32* %addr2, i32 %j
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call void @copy(i32* %addr2i, i32* %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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