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[PATCH][ARM] PR56315 Improve codegen for DImode immediates - XOR
- From: "Kyrylo Tkachov" <kyrylo dot tkachov at arm dot com>
- To: <gcc-patches at gcc dot gnu dot org>
- Cc: "Ramana Radhakrishnan" <Ramana dot Radhakrishnan at arm dot com>, "Richard Earnshaw" <Richard dot Earnshaw at arm dot com>
- Date: Fri, 7 Jun 2013 14:03:02 +0100
- Subject: [PATCH][ARM] PR56315 Improve codegen for DImode immediates - XOR
Hi all,
In a similar vein to
http://gcc.gnu.org/ml/gcc-patches/2013-05/msg01838.html this patch lets
us use the immediate forms of the eor instruction when dealing with
64-bit constants.
The insn is changed into an insn_and_split and merged with the NEON
version. A new constraint is introduced to make sure the pattern accepts
the correct range of immediates.
Now for code:
unsigned long long xor64 (unsigned long long input)
{
return input ^ 0x200000004ULL;
}
we generate:
eor r0, r0, #4
eor r1, r1, #2
without any mov immediates.
Regtested arm-none-eabi on qemu with and without -mthumb.
Ok for trunk?
Thanks,
Kyrill
gcc/
2013-06-07 Kyrylo Tkachov <kyrylo.tkachov@arm.com>
PR target/56315
* config/arm/arm.md (*xordi3_insn): Change to insn_and_split.
(xordi3): Change operand 2 constraint to arm_xordi_operand.
* config/arm/constraints.md (Dg): New constraint.
* config/arm/neon.md (xordi3_neon): Remove.
(neon_veor<mode>): Generate xordi3 instead of xordi3_neon.
* config/arm/predicates.md (arm_xordi_operand): New predicate.
gcc/testsuite/
2013-06-07 Kyrylo Tkachov <kyrylo.tkachov@arm.com>
PR target/56315
* gcc.target/arm/xordi3-opt.c: New test.