On Wed, May 12, 2021 at 1:35 AM H.J. Lu <hjl.to...@gmail.com> wrote: > > It is only defined for i386 and everyone uses the default: > > #define MAX_BITSIZE_MODE_ANY_INT (64*BITS_PER_UNIT)
The default is determined by genmodes.c which looks at the maximum size of any [partial] integer mode. Since we have INT_MODE (OI, 32); INT_MODE (XI, 64); this will increase the size of wide_int. aarch64 and arm are the only other targets with XImode, OImode is also used by s390 and ia64. Keeping wide_int small is desirable. Richard. > Whatever problems we had before, they have been fixed now. > > * config/i386/i386-modes.def (MAX_BITSIZE_MODE_ANY_INT): Removed. > --- > gcc/config/i386/i386-modes.def | 15 +++------------ > 1 file changed, 3 insertions(+), 12 deletions(-) > > diff --git a/gcc/config/i386/i386-modes.def b/gcc/config/i386/i386-modes.def > index dbddfd8e48f..4e7014be034 100644 > --- a/gcc/config/i386/i386-modes.def > +++ b/gcc/config/i386/i386-modes.def > @@ -107,19 +107,10 @@ INT_MODE (XI, 64); > PARTIAL_INT_MODE (HI, 16, P2QI); > PARTIAL_INT_MODE (SI, 32, P2HI); > > -/* Mode used for signed overflow checking of TImode. As > - MAX_BITSIZE_MODE_ANY_INT is only 160, wide-int.h reserves only that > - rounded up to multiple of HOST_BITS_PER_WIDE_INT bits in wide_int etc., > - so OImode is too large. For the overflow checking we actually need > - just 1 or 2 bits beyond TImode precision. Use 160 bits to have > - a multiple of 32. */ > +/* Mode used for signed overflow checking of TImode. For the overflow > + checking we actually need just 1 or 2 bits beyond TImode precision. > + Use 160 bits to have a multiple of 32. */ > PARTIAL_INT_MODE (OI, 160, POI); > > -/* Keep the OI and XI modes from confusing the compiler into thinking > - that these modes could actually be used for computation. They are > - only holders for vectors during data movement. Include POImode precision > - though. */ > -#define MAX_BITSIZE_MODE_ANY_INT (160) > - > /* The symbol Pmode stands for one of the above machine modes (usually > SImode). > The tm.h file specifies which one. It is not a distinct mode. */ > -- > 2.31.1 >
