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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/113469] RISC-V: Illegal Insn for test case 920501-8.c
 when make linux for rv32
Date: Fri, 26 Jan 2024 06:50:32 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113469

--- Comment #1 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:d40b3c1e439db05c835b6bd4fd5bba58fda71dd6

commit r14-8442-gd40b3c1e439db05c835b6bd4fd5bba58fda71dd6
Author: Juzhe-Zhong <juzhe.zhong@rivai.ai>
Date:   Fri Jan 26 14:46:21 2024 +0800

    RISC-V: Fix incorrect LCM delete bug [VSETVL PASS]

    This patch fixes the recent noticed bug in RV32 glibc.

    We incorrectly deleted a vsetvl:

            ...
            and     a4,a4,a3
            vmv.v.i v1,0                 ---> Missed vsetvl cause illegal
instruction report.
            vse8.v  v1,0(a5)

    The root cause the laterin in LCM is incorrect.

          BB 358:
            avloc: n_bits =3D 2, set =3D {}
            kill: n_bits =3D 2, set =3D {}
            antloc: n_bits =3D 2, set =3D {}
            transp: n_bits =3D 2, set =3D {}
            avin: n_bits =3D 2, set =3D {}
            avout: n_bits =3D 2, set =3D {}
            del: n_bits =3D 2, set =3D {}

    cause LCM let BB 360 delete the vsetvl:

          BB 360:
            avloc: n_bits =3D 2, set =3D {}
            kill: n_bits =3D 2, set =3D {}
            antloc: n_bits =3D 2, set =3D {}
            transp: n_bits =3D 2, set =3D {0 1 }
            avin: n_bits =3D 2, set =3D {}
            avout: n_bits =3D 2, set =3D {}
            del: n_bits =3D 2, set =3D {1}

    Also, remove unknown vsetvl info into local computation since it is
unnecessary.

    Tested on both RV32/RV64 no regression.

            PR target/113469

    gcc/ChangeLog:

            * config/riscv/riscv-vsetvl.cc
(pre_vsetvl::compute_lcm_local_properties): Fix bug.

    gcc/testsuite/ChangeLog:

            * gcc.target/riscv/rvv/autovec/pr113469.c: New test.=