https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82210
Aldy Hernandez <aldyh at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |aldyh at gcc dot gnu.org
--- Comment #3 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
Even with aligned, as Richard points out:
struct {
__attribute__((aligned(16)))
struct {
short aa;
} a[size];
int b[size];
} s;
the .original dump setting s.b[i]=0 is:
s.b{off: (sizetype) SAVE_EXPR <size> * 2}[i] = 0;
I would have expected size * 2 plus magic to round up to 16 bytes. It looks
like we're throwing away the alignment.
As a reference, without the aligned attribute we get:
s.b{off: (sizetype) SAVE_EXPR <size> * 2 + 3 & 18446744073709551612}[i] = 0;
Note: C operator precedence actually yields (size * 2 + 3) & blah
Which is rounding up to 4 byte alignment.
I'll investigate.
