Paolo Bonzini <[email protected]> wrote:
> I would like to know whether for avr,bfin,cris,frv,h8300,pdp11,rs6000
> (which define SHIFT_COUNT_TRUNCATED as 0) and for mcore,sh,vax (which
> do not define it at all) it is right that shift counts are never
> truncated.
sh defines SHIFT_COUNT_TRUNCATED according to target and
there are comments for it:
/* Immediate shift counts are truncated by the output routines (or was it
the assembler?). Shift counts in a register are truncated by SH. Note
that the native compiler puts too large (> 32) immediate shift counts
into a register and shifts by the register, letting the SH decide what
to do instead of doing that itself. */
/* ??? The library routines in lib1funcs.asm truncate the shift count.
However, the SH3 has hardware shifts that do not truncate exactly as gcc
expects - the sign bit is significant - so it appears that we need to
leave this zero for correct SH3 code. */
#define SHIFT_COUNT_TRUNCATED (! TARGET_SH3 && ! TARGET_SH2A)
Is this enough information for you?
Regards,
kaz
