| ; 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 |
| } |