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[Bug target/65249] unable to find a register to spill in class 'R0_REGS' when compiling protobuf on sh4
- From: "kkojima at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Mon, 02 Mar 2015 06:18:04 +0000
- Subject: [Bug target/65249] unable to find a register to spill in class 'R0_REGS' when compiling protobuf on sh4
- Auto-submitted: auto-generated
- References: <bug-65249-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65249
--- Comment #13 from Kazumoto Kojima <kkojima at gcc dot gnu.org> ---
Created attachment 34915
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34915&action=edit
an adhoc patch for 4.9
It pre-allocates R0 for this special case to break long R0 liveness.
Ugly but it works. I'll test the similar patch on trunk with adding
!sh_lra_flag guard.