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[Bug optimization/12630] [3.4 regression] Various unrecognizable insns and ICEs at -O3
- From: "dave at hiauly1 dot hia dot nrc dot ca" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 20 Oct 2003 22:06:46 -0000
- Subject: [Bug optimization/12630] [3.4 regression] Various unrecognizable insns and ICEs at -O3
- References: <20031015232442.12630.danglin@gcc.gnu.org>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12630
------- Additional Comments From dave at hiauly1 dot hia dot nrc dot ca 2003-10-20 22:06 -------
Subject: Re: [3.4 regression] Various unrecognizable
> > Switching from match_dup to match_scratch introduced a need for two
> additional
> > temporaries. We only have one register in the class R1_REGS.
>
> Why these two temporaries are needed?
> R1_REGS has constraint 'a' that is not used in the pattern at all so why
> reload chooses to use it?
I don't know. The PA backend only uses class R1_REGS for two very specific
situations and this isn't one of them.
Dave