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7eca38ce76
Add nuw attribute to inbounds GEPs where the expression used to form the GEP is an addition of unsigned indices. Relands #105496, which was reverted because it exposed a miscompilation arising from #98608. This is now fixed by #106512.
28 lines
1.1 KiB
C++
28 lines
1.1 KiB
C++
// RUN: %clang_cc1 -std=c++17 -triple x86_64-linux-gnu -emit-llvm -o - %s | FileCheck %s
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int a[1];
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// CHECK: @a = global [1 x i32] zeroinitializer
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template <int>
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void test_transform() {
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auto [b] = a;
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}
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void (*d)(){test_transform<0>};
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// CHECK-LABEL: define {{.*}} @_Z14test_transformILi0EEvv
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// CHECK: [[ENTRY:.*]]:
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// CHECK-NEXT: [[ARR:%.*]] = alloca [1 x i32]
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// CHECK-NEXT: [[BEGIN:%.*]] = getelementptr inbounds [1 x i32], ptr [[ARR]], i64 0, i64 0
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// CHECK-NEXT: br label %[[BODY:.*]]
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// CHECK-EMPTY:
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// CHECK-NEXT: [[BODY]]:
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// CHECK-NEXT: [[CUR:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[NEXT:%.*]], %[[BODY]] ]
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// CHECK-NEXT: [[DEST:%.*]] = getelementptr inbounds i32, ptr [[BEGIN]], i64 [[CUR]]
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// CHECK-NEXT: [[SRC:%.*]] = getelementptr inbounds nuw [1 x i32], ptr @a, i64 0, i64 [[CUR]]
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// CHECK-NEXT: [[X:%.*]] = load i32, ptr [[SRC]]
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// CHECK-NEXT: store i32 [[X]], ptr [[DEST]]
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// CHECK-NEXT: [[NEXT]] = add nuw i64 [[CUR]], 1
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// CHECK-NEXT: [[EQ:%.*]] = icmp eq i64 [[NEXT]], 1
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// CHECK-NEXT: br i1 [[EQ]], label %[[FIN:.*]], label %[[BODY]]
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// CHECK-EMPTY:
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// CHECK-NEXT: [[FIN]]:
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// CHECK-NEXT: ret void
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