On Wed, Aug 28, 2024 at 01:18:34PM +0200, Jason A. Donenfeld wrote:
On Tue, Aug 27, 2024 at 05:53:30PM -0500, Segher Boessenkool wrote:
On Tue, Aug 27, 2024 at 11:08:19AM -0700, Eric Biggers wrote:
for (i = 0; i < ARRAY_SIZE(params->reserved); i++)params->reserved[i] = 0;
This is a loop. With -ftree-loop-distribute-patterns, the default at -O2, this is optimised to
memset(params->reserved, 0, ...);
(which is perfectly fine, since memset is required to be there even for freestanding environments, this is documented!)
-fno-tree-loop-distribute-patterns . But, as always, read up on it, see what it actually does (and how it avoids your problem, and mostly: learn what the actual problem *was*!)
This might help with various loops, but it doesn't help with the matter that this patch fixes, which is struct initialization. I just tried it with the arm64 patch to no avail.
It very much *does* help. Try harder? Maybe you typoed?
Segher