https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114516
Bug ID: 114516
Summary: RISC-V: TSVC2 s315 has spill with dynamic lmul
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: deminhan at gcc dot gnu.org
Target Milestone: ---
-march=rv64gcv_zba_zbb -mabi=lp64d -mrvv-max-lmul=dynamic -O3
typedef float real_t;
__attribute__((aligned(64))) real_t a[32000];
real_t s315()
{
for (int i = 0; i < 32000; i++)
a[i] = (i * 7) % 32000;
real_t x, chksum;
int index;
for (int nl = 0; nl < 256; nl++) {
x = a[0];
index = 0;
for (int i = 0; i < 32000; ++i) {
if (a[i] > x) {
x = a[i];
index = i;
}
}
chksum = x + (real_t) index;
}
return index + x + 1;
}
M8 is selected and has register spill.
.LFB0:
.cfi_startproc
li a2,274878464
vsetvli a1,zero,e32,m8,ta,ma
addiw a2,a2,-557
vmv.v.x v8,a2
csrr t0,vlenb
slli t1,t0,3
li a4,32768
addiw a4,a4,-768
sub sp,sp,t1
.cfi_escape 0xf,0x9,0x72,0,0x92,0xa2,0x38,0,0x40,0x1e,0x22
vs8r.v v8,0(sp)
vmv.v.x v8,a4
li a3,32768
lui a4,%hi(a)
vmv8r.v v0,v8
vid.v v16
addi a6,a4,%lo(a)
addi a3,a3,-768
addi a4,a4,%lo(a)
.L2:
vsetvli a5,a3,e8,m2,ta,ma
vsetvli a2,zero,e32,m8,ta,ma
vmv.v.i v8,7
vsetvli zero,a5,e32,m8,ta,ma
sub a3,a3,a5
vmul.vv v24,v16,v8
vl8re32.v v8,0(sp)
vmulh.vv v8,v24,v8
vsra.vi v8,v8,11
vnmsub.vv v8,v0,v24
vsetvli a2,zero,e32,m8,ta,ma
vmv.v.x v24,a5
vsetvli zero,a5,e32,m8,ta,ma
vfcvt.f.x.v v8,v8
vsetvli a2,zero,e32,m8,ta,ma
vadd.vv v16,v16,v24
vsetvli zero,a5,e32,m8,ta,ma
vse32.v v8,0(a4)
sh2add a4,a5,a4
bne a3,zero,.L2
flw fa3,0(a6)
li a3,32768
addi a3,a3,-768
li a0,256
