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[Bug target/81763] Issues with BMI on 32bit x86 apps on GCC 7.1+
- From: "ubizjak at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 25 Jan 2018 20:10:19 +0000
- Subject: [Bug target/81763] Issues with BMI on 32bit x86 apps on GCC 7.1+
- Auto-submitted: auto-generated
- References: <bug-81763-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81763
--- Comment #37 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Jakub Jelinek from comment #33)
> and it should work. The last case would be right now:
> SI:N+1 = SI:N &~ SI:N+2; SI:N+2 = SI:N+1 &~ SI:N+3;
> and is again wrong, but we could again swap:
> SI:N+2 = SI:N+1 &~ SI:N+3; SI:N+1 = SI:N &~ SI:N+2;
> and all is fine.
Whoops, it looks that SI:N+2 is clobbered in the swapped case.