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