On Fri, Jan 29, 2021 at 11:11:23AM +0800, HAO CHEN GUI via Gcc-patches wrote: > This patch tries to optimize PowerPC 64 bit constant generation when the > constant can be transformed from a 32 bit or 16 bit constant by rotating, > shifting and mask AND.
All and more of what you are doing here for rotated 16-bit constants is covered by https://gcc.gnu.org/pipermail/gcc-patches/2020-October/555760.html That patch is still waiting on review. Hmm, I see my local copy of that patch has one extra line in gcc/testsuite/gcc.target/powerpc/rot_cst2.c +/* { dg-additional-options "-mno-prefixed" { target { lp64 } } } */ in order to keep scan-assembler-times counts correct for power10. -- Alan Modra Australia Development Lab, IBM
