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[Bug target/68543] [AArch64] Implement overflow arithmetic standard names {u,}{add,sub,mul}v4<mode> and/or negv3<mode>
- From: "rth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 28 Jan 2016 18:21:58 +0000
- Subject: [Bug target/68543] [AArch64] Implement overflow arithmetic standard names {u,}{add,sub,mul}v4<mode> and/or negv3<mode>
- Auto-submitted: auto-generated
- References: <bug-68543-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68543
Richard Henderson <rth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2016-01-28
CC| |rth at gcc dot gnu.org
Target Milestone|--- |7.0
Ever confirmed|0 |1
Severity|normal |enhancement
--- Comment #5 from Richard Henderson <rth at gcc dot gnu.org> ---
Confirmed.
Note that negv<mode>3 isn't required if subv<mode>4 accepts zero as
its first argument.
I don't believe that there is anything that aarch64 can usefully do
with mulv<mode>4 -- generic code should use the widening multiplies
as efficiently as anything we can do.
Patch for some of this at
https://gcc.gnu.org/ml/gcc-patches/2016-01/msg01903.html