On 02/06/2014 08:02 AM, Jakub Jelinek wrote: > On Thu, Feb 06, 2014 at 06:53:55AM -0800, Richard Henderson wrote: >> On 02/04/2014 04:40 AM, Jakub Jelinek wrote: >>> - tem = expand_shift (LSHIFT_EXPR, mode, lopart, hprec, NULL_RTX, 1); >>> + tem = gen_rtx_SUBREG (mode, lopart, 0); >>> + tem = expand_shift (LSHIFT_EXPR, mode, tem, hprec, NULL_RTX, 1); >> >> I would be happier with gen_lowpart rather than the explicit gen_rtx_subreg. > > I need a paradoxical subreg, gen_lowpart ICEs in that case
It does? Since when? I've certainly used it for paradoxicals in the past. Oh, I see, yes, it would ICE for a multi-word paradoxical subreg. But that sort of thing is ... skirting the bounds of validity at best. Surely we should be able to optimize away a zero-extension in all cases? r~
