在 2023/9/6 下午6:58, Xi Ruoyao 写道:
Forgot to mention: I've bootstrapped and regtested this patch on
loongarch64-linux-gnu (with PR110939 patch applied to unbreak the
bootstrapping). Ok for trunk?
LGTM!
Thanks!
On Wed, 2023-09-06 at 18:46 +0800, Xi Ruoyao wrote:
If mask is a constant with value ((1 << N) - 1) << M we can perform this
optimization.
gcc/ChangeLog:
PR target/111252
* config/loongarch/loongarch-protos.h
(loongarch_pre_reload_split): Declare new function.
(loongarch_use_bstrins_for_ior_with_mask): Likewise.
* config/loongarch/loongarch.cc
(loongarch_pre_reload_split): Implement.
(loongarch_use_bstrins_for_ior_with_mask): Likewise.
* config/loongarch/predicates.md (ins_zero_bitmask_operand):
New predicate.
* config/loongarch/loongarch.md (bstrins_<mode>_for_mask):
New define_insn_and_split.
(bstrins_<mode>_for_ior_mask): Likewise.
(define_peephole2): Further optimize code sequence produced by
bstrins_<mode>_for_ior_mask if possible.
gcc/testsuite/ChangeLog:
* g++.target/loongarch/bstrins-compile.C: New test.
* g++.target/loongarch/bstrins-run.C: New test.
/* snip */
