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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/111848] RISC-V: RVV cost model pick unexpected big LMUL
Date: Tue, 17 Oct 2023 11:07:48 +0000 [thread overview]
Message-ID: <bug-111848-4-NzaTqaONmc@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-111848-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111848
--- Comment #1 from JuzheZhong <juzhe.zhong at rivai dot ai> ---
Sorry, it pick LMUL = 4:
f3:
ble a4,zero,.L11
csrr t0,vlenb
slli t1,t0,4
csrr a6,vlenb
sub sp,sp,t1
csrr a5,vlenb
slli a6,a6,3
slli a5,a5,2
add a6,a6,sp
vsetvli a7,zero,e16,m8,ta,ma
slli a4,a4,3
vid.v v8
addi t6,a5,-1
vand.vi v8,v8,-2
neg t5,a5
vs8r.v v8,0(sp)
vadd.vi v8,v8,1
vs8r.v v8,0(a6)
j .L7
.L14:
vsetvli a7,zero,e16,m8,ta,ma
.L7:
csrr t0,vlenb
slli t0,t0,3
vl8re16.v v16,0(sp)
add t0,t0,sp
vmv.v.x v8,t6
mv t1,a4
vand.vv v24,v16,v8
mv a6,a4
vl8re16.v v16,0(t0)
vand.vv v8,v16,v8
bleu a4,a5,.L6
mv a6,a5
.L6:
vsetvli zero,a6,e8,m4,ta,ma
vle8.v v20,0(a2)
vle8.v v16,0(a3)
vsetvli a7,zero,e8,m4,ta,ma
vrgatherei16.vv v4,v20,v24
vadd.vv v4,v16,v4
vsetvli zero,a6,e8,m4,ta,ma
vse8.v v4,0(a0)
vle8.v v20,0(a2)
vsetvli a7,zero,e8,m4,ta,ma
vrgatherei16.vv v4,v20,v8
vadd.vv v4,v4,v16
vsetvli zero,a6,e8,m4,ta,ma
vse8.v v4,0(a1)
Ideally LMUL should be 2:
f3:
ble a4,zero,.L9
csrr a5,vlenb
slli a5,a5,1
vsetvli a7,zero,e16,m4,ta,ma
slli a4,a4,3
vid.v v12
addi t6,a5,-1
vand.vi v12,v12,-2
neg t5,a5
vadd.vi v16,v12,1
j .L7
.L10:
vsetvli a7,zero,e16,m4,ta,ma
.L7:
vmv.v.x v4,t6
mv t1,a4
vand.vv v20,v12,v4
mv a6,a4
vand.vv v4,v16,v4
bleu a4,a5,.L6
mv a6,a5
.L6:
vsetvli zero,a6,e8,m2,ta,ma
vle8.v v10,0(a2)
vle8.v v8,0(a3)
vsetvli a7,zero,e8,m2,ta,ma
vrgatherei16.vv v2,v10,v20
vadd.vv v2,v8,v2
vsetvli zero,a6,e8,m2,ta,ma
vse8.v v2,0(a0)
vle8.v v10,0(a2)
vsetvli a7,zero,e8,m2,ta,ma
vrgatherei16.vv v2,v10,v4
vadd.vv v2,v2,v8
vsetvli zero,a6,e8,m2,ta,ma
vse8.v v2,0(a1)
add a4,a4,t5
add a0,a0,a5
add a3,a3,a5
add a1,a1,a5
add a2,a2,a5
bgtu t1,a5,.L10
.L9:
ret
next prev parent reply other threads:[~2023-10-17 11:07 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-17 11:03 [Bug c/111848] New: " juzhe.zhong at rivai dot ai
2023-10-17 11:07 ` juzhe.zhong at rivai dot ai [this message]
2023-10-20 3:57 ` [Bug target/111848] " cvs-commit at gcc dot gnu.org
2023-10-20 6:39 ` juzhe.zhong at rivai dot ai
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