https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93820
Jakub Jelinek <jakub at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Summary|[9/10 Regression] wrong |[9/10 Regression] wrong |code at -O3 on |code at -O3 on |x86_64-linux-gnu |x86_64-linux-gnu since | |r9-1732 --- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> --- So one can turn it into: /* PR tree-optimization/93820 */ /* { dg-do run } */ /* { dg-options "-O2 -fno-tree-dse" } */ typedef int v4si __attribute__((vector_size(4 * sizeof (int)))); int a[10]; __attribute__((noipa)) int foo (int *p) { a[6] = *p; a[4] = 1; *(((v4si *)&a[0]) + 1) = (v4si) { 0, 0, 0, 0 }; a[3] = 0; } int main () { int i = 0; foo (&i); for (i = 0; i < 10; i++) if (a[i]) __builtin_abort (); return 0; } which started to be miscompiled with r9-1732-ga7fe6482214cb17e37b1099b2e0e7b2a6babdc47 Thus, I'll have a look.