62 lines
2.9 KiB
LLVM
62 lines
2.9 KiB
LLVM
; RUN: opt < %s -passes=instcombine -S | FileCheck %s
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;
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; Verify that a constant with size in excess of 32-bit SIZE_MAX doesn't
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; cause trouble. This test exercises an internal limit set arbitrarily
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; at 64K for the largest supported zeroinitiazer. If the limit changes
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; the test might need to be adjusted.
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declare i8* @memrchr(i8*, i32, i64)
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@a = constant <{ i8, [4294967295 x i8] }> <{ i8 1, [4294967295 x i8] zeroinitializer }>
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; Verify reading an initializer INT32_MAX + 1 bytes large (starting at
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; offset 2147483647 into a which is UINT32_MAX bytes in size).
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define i8* @call_a_pi32max_p1() {
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; CHECK-LABEL: @call_a_pi32max_p1(
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; CHECK-NEXT: [[CHR:%.*]] = tail call i8* @memrchr(i8* noundef nonnull dereferenceable(2147483647) getelementptr inbounds (<{ i8, [4294967295 x i8] }>, <{ i8, [4294967295 x i8] }>* @a, i64 0, i32 1, i64 2147483647), i32 0, i64 2147483647)
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; CHECK-NEXT: ret i8* [[CHR]]
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;
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%ptr = getelementptr <{ i8, [4294967295 x i8] }>, <{ i8, [4294967295 x i8] }>* @a, i32 0, i32 1, i32 2147483647
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%chr = tail call i8* @memrchr(i8* %ptr, i32 0, i64 2147483647)
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ret i8* %chr
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}
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; Verify reading an initializer INT32_MAX bytes large (starting at offset
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; 2147483648 into a which is UINT32_MAX bytes in size).
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define i8* @call_a_pi32max() {
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; CHECK-LABEL: @call_a_pi32max(
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; CHECK-NEXT: [[CHR:%.*]] = tail call i8* @memrchr(i8* noundef nonnull dereferenceable(2147483647) getelementptr inbounds (<{ i8, [4294967295 x i8] }>, <{ i8, [4294967295 x i8] }>* @a, i64 0, i32 1, i64 2147483648), i32 0, i64 2147483647)
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; CHECK-NEXT: ret i8* [[CHR]]
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;
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%ptr = getelementptr <{ i8, [4294967295 x i8] }>, <{ i8, [4294967295 x i8] }>* @a, i32 0, i32 1, i64 2147483648
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%chr = tail call i8* @memrchr(i8* %ptr, i32 0, i64 2147483647)
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ret i8* %chr
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}
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; Verify reading an initializer UINT32_MAX bytes large (starting at offset
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; 1 into a).
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define i8* @call_a_pui32max() {
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; CHECK-LABEL: @call_a_pui32max(
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; CHECK-NEXT: [[CHR:%.*]] = tail call i8* @memrchr(i8* noundef nonnull dereferenceable(4294967295) getelementptr inbounds (<{ i8, [4294967295 x i8] }>, <{ i8, [4294967295 x i8] }>* @a, i64 0, i32 1, i64 0), i32 0, i64 4294967295)
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; CHECK-NEXT: ret i8* [[CHR]]
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;
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%ptr = getelementptr <{ i8, [4294967295 x i8] }>, <{ i8, [4294967295 x i8] }>* @a, i32 0, i32 1, i32 0
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%chr = tail call i8* @memrchr(i8* %ptr, i32 0, i64 4294967295)
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ret i8* %chr
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}
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; Verify reading an initializer UINT32_MAX + 1 bytes large (all of a).
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define i8* @call_a_puimax_p1() {
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; CHECK-LABEL: @call_a_puimax_p1(
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; CHECK-NEXT: [[CHR:%.*]] = tail call i8* @memrchr(i8* noundef nonnull dereferenceable(4294967296) getelementptr inbounds (<{ i8, [4294967295 x i8] }>, <{ i8, [4294967295 x i8] }>* @a, i64 0, i32 0), i32 0, i64 4294967296)
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; CHECK-NEXT: ret i8* [[CHR]]
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;
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%ptr = getelementptr <{ i8, [4294967295 x i8] }>, <{ i8, [4294967295 x i8] }>* @a, i32 0, i32 0
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%chr = tail call i8* @memrchr(i8* %ptr, i32 0, i64 4294967296)
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ret i8* %chr
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} |