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TheRock/compiler/amd-llvm/clang/test/C/drs/dr494.c
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Flatten subprojects into a single base monorepo
2026-09-02 16:34:47 -07:00

31 lines
1.0 KiB
C

/* RUN: %clang_cc1 -std=c89 %s -emit-llvm -o - | FileCheck %s
RUN: %clang_cc1 -std=c99 %s -emit-llvm -o - | FileCheck %s
RUN: %clang_cc1 -std=c11 %s -emit-llvm -o - | FileCheck %s
RUN: %clang_cc1 -std=c17 %s -emit-llvm -o - | FileCheck %s
RUN: %clang_cc1 -std=c2x %s -emit-llvm -o - | FileCheck %s
*/
/* WG14 DR494: yes
* Part 1: Alignment specifier expression evaluation
*/
void dr494(void) {
int i = 12;
int j = _Alignof(int [++i]);
int k = sizeof(int [++i]);
/* Check that we store a straight value for i and j, but have to calculate a
* value for storing into k. That's because sizeof() needs to execute code to
* get the correct value from a VLA, but _Alignof is not allowed to execute
* the VLA extent at runtime.
*/
/* CHECK: %[[I:.+]] = alloca i32
CHECK: %[[J:.+]] = alloca i32
CHECK: %[[K:.+]] = alloca i32
CHECK: store i32 12, ptr %[[I]]
CHECK: store i32 4, ptr %[[J]]
CHECK: %[[ZERO:.+]] = load i32, ptr %[[I]]
CHECK: %[[INC:.+]] = add nsw i32 %[[ZERO]], 1
CHECK: store i32 %[[INC]], ptr %[[I]]
*/
}