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[Bug bootstrap/78390] [7 Regression] Bootstrap failure: match.pd: cannot determine type of operand
- From: "vogt at linux dot vnet.ibm.com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Fri, 18 Nov 2016 14:41:20 +0000
- Subject: [Bug bootstrap/78390] [7 Regression] Bootstrap failure: match.pd: cannot determine type of operand
- Auto-submitted: auto-generated
- References: <bug-78390-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78390
--- Comment #19 from Dominik Vogt <vogt at linux dot vnet.ibm.com> ---
(In reply to Segher Boessenkool from comment #17)
> Combine should probably not try to generate this extract, I wonder if it
> can exist on any target. So where is it coming from?
>
> Of course the target should not "successfully" match it ;-)
There is a discussion going on about this issue:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77822
I'm working on an s390[x] patch to reject such combinations, but the middleend
should probably not generate this in the first place.