Re: Validity of SUBREG+AND-imm transformations

[Jeff Law]

On 03/07/2016 03:44 AM, Kyrill Tkachov wrote:


The RTL documentation for ASHIFT and friends says that the shift amount
must be:
"a fixed-point mode or be a constant with mode @code{VOIDmode}; which
mode is determined by the mode called for in the machine description
entry for the left-shift instruction". For example, on the VAX, the mode
of @var{c} is @code{QImode} regardless of @var{m}.
Use QImode in the named pattern/expander and use the other modes in an 
unnamed/anonymous pattern.
Jeff