On Fri, Apr 5, 2013 at 1:49 PM, Bill Schmidt <wschm...@linux.vnet.ibm.com> wrote: > This patch improves code generation for Newton-Raphson reciprocal > estimates for divide and square root on PowerPC > (http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56843). > > For the divide case, we formerly had specialized routines for two- and > three-pass estimates. Rather than add new routines for one- and > four-pass estimates, I removed those and rewrote the algorithm to be > general for any number of passes. This unfortunately makes the patch > hard to read. It will probably be easiest to review by applying it to a > tree and looking at the whole rs6000_emit_swdiv function. > > Bootstrapped and tested on powerpc64-unknown-linux-gnu with no new > regressions. Ok for trunk? > > Thanks, > Bill > > > gcc: > > 2013-04-05 Bill Schmidt <wschm...@linux.vnet.ibm.com> > > PR target/56843 > * config/rs6000/rs6000.c (rs6000_emit_swdiv_high_precision): Remove. > (rs6000_emit_swdiv_low_precision): Remove. > (rs6000_emit_swdiv): Rewrite to handle between one and four > iterations of Newton-Raphson generally; modify required number of > iterations for some cases. > * config/rs6000/rs6000.h (RS6000_RECIP_HIGH_PRECISION_P): Remove. > > gcc/testsuite: > > 2013-04-05 Bill Schmidt <wschm...@linux.vnet.ibm.com> > > PR target/56843 > * gcc.target/powerpc/recip-1.c: Modify expected output. > * gcc.target/powerpc/recip-3.c: Likewise. > * gcc.target/powerpc/recip-4.c: Likewise. > * gcc.target/powerpc/recip-5.c: Add expected output for iterations.
Okay. Thanks, David
