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[Bug target/63949] Aarch64 instruction combiner does not optimize subsi_sxth function as expected (gcc.target/aarch64/extend.c fails)
- 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, 08 Jan 2015 12:07:10 +0000
- Subject: [Bug target/63949] Aarch64 instruction combiner does not optimize subsi_sxth function as expected (gcc.target/aarch64/extend.c fails)
- Auto-submitted: auto-generated
- References: <bug-63949-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63949
Segher Boessenkool <segher at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |segher at gcc dot gnu.org
--- Comment #9 from Segher Boessenkool <segher at gcc dot gnu.org> ---
A MULT by a constant power of 2 is not canonical RTL (well, not what
simplify_rtx would give you); combine shouldn't generate this.