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testsuite: torture: add LLVM testcase for DSE vs. -ftrivial-auto-var-init=

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This testcase came up in a recent LLVM bug report [0] for DSE vs
-ftrivial-auto-var-init=. Add it to our testsuite given that area
could do with better coverage.

[0] https://github.com/llvm/llvm-project/issues/119646

gcc/testsuite/ChangeLog:

	* gcc.dg/torture/dse-trivial-auto-var-init.c: New test.

Co-authored-by: Andrew Pinski <pinskia@gmail.com>
This commit is contained in:
Sam James 2024-12-13 04:42:29 +00:00
parent c7754a2fb2
commit 26ca00eeed
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gcc/testsuite/gcc.dg/torture/dse-trivial-auto-var-init.c Normal file
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@ -0,0 +1,17 @@
/* Testcase for LLVM bug: https://github.com/llvm/llvm-project/issues/119646 */
/* { dg-do run } */
/* { dg-additional-options "-ftrivial-auto-var-init=zero" } */
int b = 208;
[[gnu::noinline]]
void f(int *e, int a) {
*e = !!b;
if (a)
__builtin_trap();
}
int main(void) {
b = 0;
f(&b, 0);
if (b != 0)
__builtin_trap();
}