On Tue, Aug 09, 2016 at 06:34:46PM +0930, Alan Modra wrote:
> The fallback part of HARD_REGNO_CALLER_SAVE_MODE, choose_hard_reg_mode,
> returns DFmode for SImode when TARGET_E500_DOUBLE. This confuses
> lra when attempting to save ctr around a call.
>
> Arseny, the bug reporter, has regression tested this patch.
> OK to apply?
Okay for trunk, thanks,
Segher
> PR target/71680
> * config/rs6000/rs6000.h (HARD_REGNO_CALLER_SAVE_MODE): Return
> SImode for TARGET_E500_DOUBLE when given SImode.
>
> diff --git a/gcc/config/rs6000/rs6000.h b/gcc/config/rs6000/rs6000.h
> index af77258..353f388 100644
> --- a/gcc/config/rs6000/rs6000.h
> +++ b/gcc/config/rs6000/rs6000.h
> @@ -1273,6 +1273,8 @@ enum data_align { align_abi, align_opt, align_both };
> && ((MODE) == VOIDmode || ALTIVEC_OR_VSX_VECTOR_MODE (MODE))
> \
> && FP_REGNO_P (REGNO) \
> ? V2DFmode
> \
> + : TARGET_E500_DOUBLE && (MODE) == SImode \
> + ? SImode \
> : TARGET_E500_DOUBLE && ((MODE) == VOIDmode || (MODE) == DFmode) \
> ? DFmode \
> : !TARGET_E500_DOUBLE && FLOAT128_IBM_P (MODE) && FP_REGNO_P (REGNO)
> \
