On Tue, Feb 02, 2021 at 11:38:11AM -0700, Jeff Law via Gcc-patches wrote: > On 1/16/21 11:13 AM, Jakub Jelinek wrote: > > Hi! > > > > The following patch tests both x / y * y and x - x % y expansion for the > > former GIMPLE code and chooses the cheaper of those sequences. > > > > Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk? > > > > 2021-01-16 Jakub Jelinek <ja...@redhat.com> > > > > PR tree-optimization/96696 > > * expr.c (expand_expr_divmod): New function. > > (expand_expr_real_2) <case TRNC_DIV_EXPR>: Use it for truncations and > > divisions. Formatting fixes. > > <case MULT_EXPR>: Optimize x / y * y as x - x % y if the latter is > > cheaper. > > > > * gcc.target/i386/pr96696.c: New test. > Given this is strictly a missed optimization, I'd lean towards deferring > to gcc-12 at this point. Thoughts?
Ok for trunk now? https://gcc.gnu.org/pipermail/gcc-patches/2021-January/563710.html Jakub
