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[Bug other/50582] Instruct GCC that added_clobbers_hard_reg_p shouldn't consider a specific register
- From: "Paulo.Matos at csr dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 05 Oct 2011 10:53:06 +0000
- Subject: [Bug other/50582] Instruct GCC that added_clobbers_hard_reg_p shouldn't consider a specific register
- Auto-submitted: auto-generated
- References: <bug-50582-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50582
--- Comment #3 from Paulo J. Matos <Paulo.Matos at csr dot com> 2011-10-05 10:53:06 UTC ---
Created attachment 25420
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=25420
Allows reload to remove trivial insn
I noticed that reload was failing to remove insn of the form:
(parallel [(set rX rX) (clobber RCC)])
Attached is a patch that does this. Removes move instructions whose clobber,
clobbers registers defined in NOT_REALLY_HARD_REG.