On Mon, Jun 20, 2011 at 7:19 AM, William J. Schmidt <wschm...@linux.vnet.ibm.com> wrote: > On Thu, 2011-06-16 at 09:49 -0700, Richard Henderson wrote: >> On 06/16/2011 04:35 AM, Richard Guenther wrote: >> > >> > + /* Bit-field insertion needs several shift and mask operations. */ >> > + case BIT_FIELD_EXPR: >> > + return 3; >> >> ... depending on the target, of course. >> > > Agreed -- this is a single-instruction operation on PowerPC. Probably > need some target-specific weights here.
It is also a single instruction on MIPS32R2 and MIPS64R2. So a target hook is the best here rather than a constant number in the target hook field. Thanks, Andrew Pinski
