All regressions (zve64d/zvl128b/zvl256b/zvl512b/zvl1024b) passed.
juzhe.zh...@rivai.ai
From: Juzhe-Zhong
Date: 2023-12-01 08:51
To: gcc-patches
CC: kito.cheng; kito.cheng; jeffreyalaw; rdapp.gcc; Juzhe-Zhong
Subject: [PATCH] RISC-V: Fix VSETVL PASS regression
This patch fix 2 regression (one
This patch fix 2 regression (one is bug regression, the other is performance
regression).
Those 2 regressions are both we are comparing ratio for same AVL in wrong place.
1. BUG regression:
avl_single-84.c:
f0:
li a5,999424
add a1,a1,a5
li a4,299008
committed as it passed zvl128/256/512/1024 no regression. Replied Message FromJuzhe-ZhongDate11/27/2023 21:24 Togcc-patches@gcc.gnu.org Cckito.ch...@gmail.com,kito.ch...@sifive.com,jeffreya...@gmail.com,rdapp@gmail.com,Juzhe-ZhongSubject[PATCH] RISC-V: Fix VSETVL PASS regression
This patch is regression fix patch, not an optimization patch.
Since trunk GCC generates redundant vsetvl than GCC-13.
This is the case:
bb 2:
def a2 (vsetvl a2, zero)
bb 3:
use a2
bb 4:
use a2 (vle)
before this patch:
bb 2:
vsetvl a2 zero
bb 3:
vsetvl zero, zero > should be eliminate
