derek.holloway
7502bf64a4
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64 lines
2.6 KiB
LLVM
64 lines
2.6 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; 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 ptr @memrchr(ptr, 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 ptr @call_a_pi32max_p1() {
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; CHECK-LABEL: @call_a_pi32max_p1(
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; CHECK-NEXT: [[CHR:%.*]] = tail call ptr @memrchr(ptr noundef nonnull dereferenceable(2147483647) getelementptr inbounds nuw (i8, ptr @a, i64 2147483648), i32 0, i64 2147483647)
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; CHECK-NEXT: ret ptr [[CHR]]
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;
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%ptr = getelementptr <{ i8, [4294967295 x i8] }>, ptr @a, i32 0, i32 1, i32 2147483647
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%chr = tail call ptr @memrchr(ptr %ptr, i32 0, i64 2147483647)
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ret ptr %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 ptr @call_a_pi32max() {
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; CHECK-LABEL: @call_a_pi32max(
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; CHECK-NEXT: [[CHR:%.*]] = tail call ptr @memrchr(ptr noundef nonnull dereferenceable(2147483647) getelementptr inbounds nuw (i8, ptr @a, i64 2147483649), i32 0, i64 2147483647)
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; CHECK-NEXT: ret ptr [[CHR]]
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;
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%ptr = getelementptr <{ i8, [4294967295 x i8] }>, ptr @a, i32 0, i32 1, i64 2147483648
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%chr = tail call ptr @memrchr(ptr %ptr, i32 0, i64 2147483647)
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ret ptr %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 ptr @call_a_pui32max() {
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; CHECK-LABEL: @call_a_pui32max(
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; CHECK-NEXT: [[CHR:%.*]] = tail call ptr @memrchr(ptr noundef nonnull dereferenceable(4294967295) getelementptr inbounds nuw (i8, ptr @a, i64 1), i32 0, i64 4294967295)
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; CHECK-NEXT: ret ptr [[CHR]]
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;
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%ptr = getelementptr <{ i8, [4294967295 x i8] }>, ptr @a, i32 0, i32 1, i32 0
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%chr = tail call ptr @memrchr(ptr %ptr, i32 0, i64 4294967295)
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ret ptr %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 ptr @call_a_puimax_p1() {
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; CHECK-LABEL: @call_a_puimax_p1(
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; CHECK-NEXT: [[CHR:%.*]] = tail call ptr @memrchr(ptr noundef nonnull dereferenceable(4294967296) @a, i32 0, i64 4294967296)
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; CHECK-NEXT: ret ptr [[CHR]]
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;
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%ptr = getelementptr <{ i8, [4294967295 x i8] }>, ptr @a, i32 0, i32 0
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%chr = tail call ptr @memrchr(ptr %ptr, i32 0, i64 4294967296)
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ret ptr %chr
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}
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