[PATCH][PR target/79752] fix rs6000 power9 peephole2 for udiv/umod
Segher Boessenkool
segher@kernel.crashing.org
Wed Mar 1 00:37:00 GMT 2017
On Tue, Feb 28, 2017 at 04:02:00PM -0600, Aaron Sawdey wrote:
> This showed up in power9 code for __divkf3 software float support and
> caused a divd to be emitted where we needed a divdu. OK for trunk if
> bootstrap/regtest passes?
Yes, certainly. Thanks!
Segher
> --- ../trunk/gcc/config/rs6000/rs6000.md        (revision 245787)
> +++ ../trunk/gcc/config/rs6000/rs6000.md        (working copy)
> @@ -3161,7 +3161,7 @@
> Â Â Â Â && ! reg_mentioned_p (operands[3], operands[1])
> Â Â Â Â && ! reg_mentioned_p (operands[3], operands[2])"
> Â Â Â [(set (match_dup 0)
> -Â Â Â Â Â Â Â (div:GPR (match_dup 1)
> +Â Â Â Â Â Â Â (udiv:GPR (match_dup 1)
> Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â (match_dup 2)))
> Â Â Â Â (set (match_dup 3)
> Â Â Â Â Â Â Â Â (mult:GPR (match_dup 0)
>
> 2017-02-28  Aaron Sawdey  <acsawdey@linux.vnet.ibm.com>
>
> PR target/79752
> * config/rs6000/rs6000.md (peephole2 for udiv/umod): Should emit
> udiv rather than div since input pattern is unsigned.
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