Craig Topper 64516ec7c1 [X86] Use parity flag from byte test/cmp instruction for __builtin_parity when input fits in 8 bits.
If the upper bits of the __builtin_parity idiom are known to be
0 we were previously emitting an xor with 0 to get the parity flag.
But we can use cmp/test instead which may expose opportunities for
load folding or combining an AND.
2020-08-02 10:45:04 -07:00
..
2020-07-30 10:42:00 -05:00
2020-07-28 20:01:57 -04:00