On Fri, 16 Feb 2024 at 14:10, Jakub Jelinek wrote: > > On Fri, Feb 16, 2024 at 01:51:54PM +0000, Jonathan Wakely wrote: > > Ah, although __atomic_compare_exchange only takes pointers, the > > compiler replaces that with a call to __atomic_compare_exchange_n > > which takes the newval by value, which presumably uses an 80-bit FP > > register and so the padding bits become indeterminate again. > > __atomic_compare_exchange_n only works with integers, so I guess > it is doing VIEW_CONVERT_EXPR (aka union-style type punning) on the > argument. > > Do you have preprocessed source for the testcase?
Sent offlist.
