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[Bug rtl-optimization/85805] [7/8/9 Regression] Wrong code for 64 bit comparisons on avr-gcc
- From: "segher at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 19 Jul 2018 16:34:36 +0000
- Subject: [Bug rtl-optimization/85805] [7/8/9 Regression] Wrong code for 64 bit comparisons on avr-gcc
- Auto-submitted: auto-generated
- References: <bug-85805-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85805
--- Comment #7 from Segher Boessenkool <segher at gcc dot gnu.org> ---
I suspect this is because we have hard regs here, not pseudos. Not a good
idea in general, which is why other targets don't do this.
Perhaps it is a mode mixup in the known value tracking?
Confirmed.