[Bug target/111037] RISC-V: Invalid vsetvli fusion

[cvs-commit at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111037

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

https://gcc.gnu.org/g:29547511f7bae06f9f424f8c8583014878240016

commit r14-3265-g29547511f7bae06f9f424f8c8583014878240016
Author: Juzhe-Zhong <juzhe.zh...@rivai.ai>
Date:   Thu Aug 17 13:59:06 2023 +0800

    RISC-V: Fix incorrect VTYPE fusion for floating point scalar move
insn[PR111037]

    void foo(_Float16 y, int64_t *i64p)
    {
      vint64m1_t vx =__riscv_vle64_v_i64m1 (i64p, 1);
      vx = __riscv_vadd_vv_i64m1 (vx, vx, 1);
      vfloat16m1_t vy =__riscv_vfmv_s_f_f16m1 (y, 1);
      asm volatile ("# use %0 %1" : : "vr"(vx), "vr" (vy));
    }

    zve64f:
    foo:
            vsetivli        zero,1,e16,mf4,ta,ma
            vle64.v v1,0(a0)
            vfmv.s.f        v2,fa0
            vsetvli zero,zero,e64,m1,ta,ma
            vadd.vv v1,v1,v1

    zve64d:
    foo:
            vsetivli        zero,1,e64,m1,ta,ma
            vle64.v v1,0(a0)
            vfmv.s.f        v2,fa0
            vadd.vv v1,v1,v1

    gcc/ChangeLog:

            PR target/111037
            * config/riscv/riscv-vsetvl.cc (float_insn_valid_sew_p): New
function.
            (second_sew_less_than_first_sew_p): Fix bug.
            (first_sew_less_than_second_sew_p): Ditto.

    gcc/testsuite/ChangeLog:

            PR target/111037
            * gcc.target/riscv/rvv/base/pr111037-1.c: New test.
            * gcc.target/riscv/rvv/base/pr111037-2.c: New test.