[Bug target/39942] Nonoptimal code - leaveq; xchg %ax,%ax; retq

[vvv at ru dot ru]

------- Comment #28 from vvv at ru dot ru  2009-05-13 19:18 -------
(In reply to comment #24)
> Using padding to avoid 4 branches in 16byte chunk may not be a good idea since
> it will increase code size.
It's enough only one byte NOP per 16-byte chunk for padding. But, IMHO, four
branches in 16 byte chunk - is very-very infrequent. Especially for 64-bit
mode.

BTW, it's difficult to understand, what Intel mean ander term "branch". Is it
CALL, JMP, conditional branches, or returns (same as AMD), or only JMP and
conditional branches. I beleave last case right.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39942