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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
929 B
Objective-C
28 lines
929 B
Objective-C
// RUN: %clang_cc1 -triple x86_64-apple-darwin10 -w -emit-llvm -o - %s -fsanitize=pointer-overflow | FileCheck %s
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// CHECK-LABEL: define{{.*}} void @variable_len_array_arith
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void variable_len_array_arith(int n, int k) {
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int vla[n];
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int (*p)[n] = &vla;
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// CHECK: getelementptr inbounds nuw i32, ptr {{.*}}, i64 [[INC:%.*]]
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// CHECK: @llvm.smul.with.overflow.i64(i64 4, i64 [[INC]]), !nosanitize
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// CHECK-NOT: select
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// CHECK: call void @__ubsan_handle_pointer_overflow{{.*}}
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++p;
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// CHECK: getelementptr inbounds i32, ptr {{.*}}, i64 [[IDXPROM:%.*]]
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// CHECK: @llvm.smul.with.overflow.i64(i64 4, i64 [[IDXPROM]]), !nosanitize
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// CHECK: select
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// CHECK: call void @__ubsan_handle_pointer_overflow{{.*}}
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p + k;
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}
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// CHECK-LABEL: define{{.*}} void @objc_id
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void objc_id(id *p) {
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// CHECK: add i64 {{.*}}, 8, !nosanitize
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// CHECK-NOT: select
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// CHECK: @__ubsan_handle_pointer_overflow{{.*}}
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p++;
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}
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