On Wed, Apr 03, 2019 at 09:13:59AM +0100, Tvrtko Ursulin wrote:
> P.S. Also the assert about no junk in high bits did not fire in CI which
> would suggest stack slot was either zero or no more than three low bits
> sets. Strange luck.

GCC happens to initialize it to zero.  It's also why GCC didn't trigger
an uninialized variable warning.  The bug was reported to GCC years ago.

regards,
dan carpenter
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