Hi Bingfeng, Thanks for commenting. It's reassuring to know that at least some ports do not have the corresponding integer modes. I have now also understood some of the background to the extra integer modes in ARM NEON and as far as I can tell the integer modes represent an opaque view of the registers as required by the ABI but not for anything relating to vectorization. I tried to follow some of the X86 code too but it's a bit too complex to dip into and understand much. I hadn't got to PowerPC yet either.
Anyway I've ripped out the TImode handling from our current MSA implementation and it did not immediately blow up. Thanks, Matthew > -----Original Message----- > From: Bingfeng Mei [mailto:b...@broadcom.com] > Sent: 12 December 2014 11:52 > To: Matthew Fortune; gcc@gcc.gnu.org > Subject: RE: Vector modes and the corresponding width integer mode > > I don't think it is required. For example, PowerPC port supports > V8SImode, but I don't see OImode. Just sometimes it could come handy to > have the equal size scalar mode. > > Cheers, > Bingfeng > > > -----Original Message----- > > From: gcc-ow...@gcc.gnu.org [mailto:gcc-ow...@gcc.gnu.org] On Behalf > > Of Matthew Fortune > > Sent: 11 December 2014 13:27 > > To: gcc@gcc.gnu.org > > Subject: Vector modes and the corresponding width integer mode > > > > Hi, > > > > I'm working on MIPS SIMD support for MSA. Can anyone point me towards > > information about the need for an integer mode of equal size to any > > supported vector mode? > > > > I.e. if I support V4SImode is there any core GCC requirement that > > TImode is also supported? > > > > Any guidance is appreciated. The MIPS port already has limited support > > for TImode for 64-bit targets which makes it all the more difficult to > > figure out if there is a relationship between vector modes and integer > > modes. > > > > Thanks, > > Matthew
