https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86891
--- Comment #12 from Richard Earnshaw ---
Author: rearnsha
Date: Wed Jan 16 15:22:08 2019
New Revision: 267972
URL: https://gcc.gnu.org/viewcvs?rev=267972=gcc=rev
Log:
__builtin__overflow issues on AArch64 (redux) (cont)
And the ChangeLog for
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86891
--- Comment #11 from Richard Earnshaw ---
Author: rearnsha
Date: Wed Jan 16 15:18:05 2019
New Revision: 267971
URL: https://gcc.gnu.org/viewcvs?rev=267971=gcc=rev
Log:
__builtin__overflow issues on AArch64 (redux)
Further investigation showed
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86891
--- Comment #10 from Wilco ---
(In reply to Richard Earnshaw from comment #9)
> Fixed.
Yes looking at git blame all of the addv/subv support was added for GCC9, so no
backporting is needed.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86891
Richard Earnshaw changed:
What|Removed |Added
Status|ASSIGNED|RESOLVED
Resolution|---
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86891
--- Comment #8 from Richard Earnshaw ---
Author: rearnsha
Date: Mon Jan 7 14:49:00 2019
New Revision: 267650
URL: https://gcc.gnu.org/viewcvs?rev=267650=gcc=rev
Log:
Investigating PR target/86891 revealed a number of issues with the way
the
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86891
Richard Earnshaw changed:
What|Removed |Added
Assignee|wilco at gcc dot gnu.org |rearnsha at gcc dot
gnu.org
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86891
--- Comment #6 from Jakub Jelinek ---
Not everything is optimized during GIMPLE optimizations, we have simplify-rtx.c
and combine.c for a reason. So, if it is possible to accurately describe the
behavior of the instruction without UNSPECs, it
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86891
--- Comment #5 from Wilco ---
(In reply to Richard Earnshaw from comment #4)
> Yes, the extension should be zero-extend, not sign extend. The plus
> operation is correct, however, since decrementing the first operand could
> lead to underflow
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86891
--- Comment #4 from Richard Earnshaw ---
Yes, the extension should be zero-extend, not sign extend. The plus operation
is correct, however, since decrementing the first operand could lead to
underflow if it was zero. So the correct rtl would
