> -----Original Message----- > From: Matthew Fortune [mailto:matthew.fort...@imgtec.com] > Sent: Friday, January 23, 2015 2:51 PM > To: Robert Suchanek; gcc-patches@gcc.gnu.org > Cc: Moore, Catherine > Subject: RE: [PATCH RFA MIPS] Prohibit vector modes in accumulators > > > 2015-01-23 Robert Suchanek <robert.sucha...@imgtec.com> > > > > * config/mips/mips.c (mips_hard_regno_mode_ok_p): Prohibit > > accumulators > > for all vector modes. > > This seems like a genuine bug and although it can only be triggered by > loongson or paired-single support it probably qualifies for fixing. > My suspicion is that the switch to LRA since GCC 4.9 may be the reason this > hasn't been noticed before. Reload seemed better in some cases at > eliminating bad decisions from IRA so this may have simply never made it > through reload by fluke. > > I'd like Catherine to review too since we are in stage4 without a reproducible > test case. >
The patch looks reasonable, but I'd like to see a test case that fails before we agree to include for GCC 5.0.
