https://bugs.llvm.org/show_bug.cgi?id=42410
Bug ID: 42410
Summary: Missing autovectorization for 8-byte vectors
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Loop Optimizer
Assignee: unassignedb...@nondot.org
Reporter: david.bolvan...@gmail.com
CC: llvm-bugs@lists.llvm.org
void foo (char *__restrict arr1, char *__restrict arr2)
{
for (int i = 0; i < 8; i++)
arr1[i] += arr2[i];
}
Clang -O3 -march=skylake
foo(char*, char*): # @foo(char*, char*)
mov al, byte ptr [rsi]
add byte ptr [rdi], al
mov al, byte ptr [rsi + 1]
add byte ptr [rdi + 1], al
mov al, byte ptr [rsi + 2]
add byte ptr [rdi + 2], al
mov al, byte ptr [rsi + 3]
add byte ptr [rdi + 3], al
mov al, byte ptr [rsi + 4]
add byte ptr [rdi + 4], al
mov al, byte ptr [rsi + 5]
add byte ptr [rdi + 5], al
mov al, byte ptr [rsi + 6]
add byte ptr [rdi + 6], al
mov al, byte ptr [rsi + 7]
add byte ptr [rdi + 7], al
ret
ICC -O3 -march=skylake
foo(char*, char*):
vmovq xmm0, QWORD PTR [rdi] #6.5
vmovq xmm1, QWORD PTR [rsi] #6.16
vpaddb xmm2, xmm0, xmm1 #6.5
vmovq QWORD PTR [rdi], xmm2 #6.5
ret
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