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From: "juzhe.zhong at rivai dot ai" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c/112401] RISC-V: So many redundant move instructions due to subreg handling on vector mode Date: Mon, 06 Nov 2023 03:53:21 +0000 [thread overview] Message-ID: <bug-112401-4-j5NM62sjJ6@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-112401-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112401 --- Comment #1 from JuzheZhong <juzhe.zhong at rivai dot ai> --- GCC ASM: subreg_to_reg_1: li a5,32 vsetvli zero,a5,e32,m8,ta,ma vle32.v v16,0(a0) vmv1r.v v8,v16 vmv1r.v v7,v17 vmv1r.v v6,v18 vmv1r.v v5,v19 vmv1r.v v4,v20 vmv1r.v v3,v21 vmv1r.v v2,v22 vmv1r.v v1,v23 beq a2,zero,.L2 li a5,0 vsetivli zero,4,e32,m1,ta,ma .L3: addi a5,a5,1 vadd.vv v8,v8,v8 vadd.vv v7,v7,v7 vadd.vv v6,v6,v6 vadd.vv v5,v5,v5 vadd.vv v4,v4,v4 vadd.vv v3,v3,v3 vadd.vv v2,v2,v2 vadd.vv v1,v1,v1 bne a2,a5,.L3 .L2: vs1r.v v8,0(a1) addi a5,a1,16 vs1r.v v7,0(a5) addi a5,a1,32 vs1r.v v6,0(a5) addi a5,a1,48 vs1r.v v5,0(a5) addi a5,a1,64 vs1r.v v4,0(a5) addi a5,a1,80 vs1r.v v3,0(a5) addi a5,a1,96 vs1r.v v2,0(a5) addi a1,a1,112 vs1r.v v1,0(a1) ret LLVM ASM: subreg_to_reg_1: # @subreg_to_reg_1 li a3, 32 vsetvli zero, a3, e32, m8, ta, ma vle32.v v8, (a0) addi a0, a1, 16 beqz a2, .LBB0_2 .LBB0_1: # =>This Inner Loop Header: Depth=1 vsetivli zero, 4, e32, m1, ta, ma vadd.vv v8, v8, v8 vadd.vv v9, v9, v9 vadd.vv v10, v10, v10 vadd.vv v11, v11, v11 vadd.vv v12, v12, v12 vadd.vv v13, v13, v13 vadd.vv v14, v14, v14 addi a2, a2, -1 vadd.vv v15, v15, v15 bnez a2, .LBB0_1 .LBB0_2: vs1r.v v8, (a1) vs1r.v v9, (a0) addi a1, a0, 16 vs1r.v v10, (a1) addi a1, a0, 32 vs1r.v v11, (a1) addi a1, a0, 48 vs1r.v v12, (a1) addi a1, a0, 64 vs1r.v v13, (a1) addi a1, a0, 80 vs1r.v v14, (a1) addi a0, a0, 96 vs1r.v v15, (a0) ret
next prev parent reply other threads:[~2023-11-06 3:53 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-11-06 3:52 [Bug c/112401] New: " juzhe.zhong at rivai dot ai 2023-11-06 3:53 ` juzhe.zhong at rivai dot ai [this message] 2024-01-18 1:27 ` [Bug rtl-optimization/112401] " juzhe.zhong at rivai dot ai 2024-01-18 1:28 ` juzhe.zhong at rivai dot ai
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