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From: "ewlu at rivosinc dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/113913] New: [14] RISC-V: suboptimal code gen for intrinsic vcreate
Date: Tue, 13 Feb 2024 22:33:45 +0000	[thread overview]
Message-ID: <bug-113913-4@http.gcc.gnu.org/bugzilla/> (raw)

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113913

            Bug ID: 113913
           Summary: [14] RISC-V: suboptimal code gen for intrinsic vcreate
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ewlu at rivosinc dot com
  Target Milestone: ---

godbolt: https://godbolt.org/z/svPsddaTd

Functions like 

vfloat16m2_t
test_vcreate_v_f16m1_f16m2 (vfloat16m1_t v0, vfloat16m1_t v1)
{
  return __riscv_vcreate_v_f16m1_f16m2 (v0, v1);
}

are generating code like

test_vcreate_v_f16m1_f16m2:
        vmv1r.v v11,v8
        vmv1r.v v10,v9
        vmv1r.v v8,v11
        vmv1r.v v9,v10
        ret

which should be optimized away into a nop like later functions in the testcase

test_vcreate_v_i64m2_i64m8:
        ret

             reply	other threads:[~2024-02-13 22:33 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-02-13 22:33 ewlu at rivosinc dot com [this message]
2024-02-13 22:54 ` [Bug target/113913] " pinskia at gcc dot gnu.org
2024-02-16 23:33 ` juzhe.zhong at rivai dot ai

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