On 7/21/24 7:58 PM, HAO CHEN GUI wrote:
Hi,
This patch adds const0 move checking for CLEAR_BY_PIECES. The original
vec_duplicate handles duplicates of non-constant inputs. But 0 is a
constant. So even a platform doesn't support vec_duplicate, it could
still do clear by pieces if it supports const0 move by that mode.
Compared to the previous version, the main change is to do const0
direct move for by-piece clear if the target supports const0 move by
that mode.
https://gcc.gnu.org/pipermail/gcc-patches/2024-January/643063.html
Bootstrapped and tested on x86 and powerpc64-linux BE and LE with no
regressions. There are several regressions on aarch64. They could be
fixed by enhancing const0 move on V2x8QImode. Is it OK for trunk?
Can you be more specific about the aarch64 regressions? Execution?
Scan-asm? ICE?
Ideally we'd include a patch to fix those regressions as well.
jeff
