https://bugs.llvm.org/show_bug.cgi?id=51978
Bug ID: 51978
Summary: Missing reduction add for vector(4) char
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
void foo_notvectorized(unsigned char *p, unsigned char *t) {
char sum = 0;
for (int i = 0; i != 4; i++)
sum += p[i];
*t = sum;
}
char foo_vectorized(char *p) {
char sum = 0;
for (int i = 0; i != 4; i++)
sum += p[i];
return sum;
}
foo_notvectorized: # @foo_notvectorized
mov al, byte ptr [rdi + 1]
add al, byte ptr [rdi]
add al, byte ptr [rdi + 2]
add al, byte ptr [rdi + 3]
mov byte ptr [rsi], al
ret
foo_vectorized: # @foo_vectorized
movd xmm0, dword ptr [rdi] # xmm0 = mem[0],zero,zero,zero
pxor xmm1, xmm1
psadbw xmm1, xmm0
movd eax, xmm1
ret
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