[Bug tree-optimization/101009] [10/11/12 Regression] wrong code with "-O3 -fno-tree-sra"
rguenth at gcc dot gnu.org
gcc-bugzilla@gcc.gnu.org
Fri Jun 11 07:21:44 GMT 2021
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101009
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[12 Regression] wrong code |[10/11/12 Regression] wrong
|with "-O3 -fno-tree-sra" |code with "-O3
| |-fno-tree-sra"
Target Milestone|12.0 |10.4
Known to work| |9.4.0
--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
With -O2 -fno-tree-sra -fno-tree-pre -ftree-loop-distribution even GCC 10
miscompiles the code. For dg-torture:
/* { dg-do run } */
/* { dg-additional-options "-fno-tree-sra -fno-tree-pre
-ftree-loop-distribution" } */
struct a {
unsigned b;
unsigned c;
} e, *f = &e;
int d = 1;
int main() {
for (; d; d--) {
struct a g[] = {{2, 1}, {2, 1}};
*f = g[1];
}
if (e.c != 1)
__builtin_abort ();
return 0;
}
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