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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/112855] [14] RISC-V vector: vsetivli clobbers variable
 value
Date: Wed, 06 Dec 2023 14:36:09 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112855

--- Comment #2 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Pan Li <panli@gcc.gnu.org>:

https://gcc.gnu.org/g:c9d5b46a25547035e381b0246de5cb553ca8b02d

commit r14-6222-gc9d5b46a25547035e381b0246de5cb553ca8b02d
Author: Juzhe-Zhong <juzhe.zhong@rivai.ai>
Date:   Wed Dec 6 22:26:46 2023 +0800

    RISC-V: Fix VSETVL PASS bug

    As PR112855 mentioned, the VSETVL PASS insert vsetvli in unexpected
location.

    Due to 2 reasons:
    1. incorrect transparant computation LCM data. We need to check VL oper=
and
defs and uses.
    2. incorrect fusion of unrelated edge which is the edge never reach the
vsetvl expression.

            PR target/112855

    gcc/ChangeLog:

            * config/riscv/riscv-vsetvl.cc
            (pre_vsetvl::compute_lcm_local_properties): Fix transparant LCM
data.
            (pre_vsetvl::earliest_fuse_vsetvl_info): Disable earliest fusion
for unrelated edge.

    gcc/testsuite/ChangeLog:

            * gcc.target/riscv/rvv/autovec/pr112855.c: New test.=