https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89028
Bug ID: 89028
Summary: 8-byte loop isn't vectorized
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: hjl.tools at gmail dot com
Target Milestone: ---
[hjl@gnu-skx-1 v64-2]$ cat y.i
void
rsqrt(char* restrict r, char* restrict a){
for (int i = 0; i < 8; i++){
r[i] += a[i];
}
}
[hjl@gnu-skx-1 v64-2]$ gcc -S -O2 y.i
[hjl@gnu-skx-1 v64-2]$ cat y.s
.file "y.i"
.text
.p2align 4,,15
.globl rsqrt
.type rsqrt, @function
rsqrt:
.LFB0:
.cfi_startproc
xorl %eax, %eax
.p2align 4,,10
.p2align 3
.L2:
movzbl (%rsi,%rax), %edx
addb %dl, (%rdi,%rax)
addq $1, %rax
cmpq $8, %rax
jne .L2
ret
.cfi_endproc
.LFE0:
.size rsqrt, .-rsqrt
.ident "GCC: (GNU) 8.2.1 20190109 (Red Hat 8.2.1-7)"
.section .note.GNU-stack,"",@progbits
[hjl@gnu-skx-1 v64-2]$
