sse - _mm_srli_si128 equivalent on altivec -

i porting program written in sse 4.2 altivec. have problem in finding equivalent intrinsic _mm_srli_si128.

when googled found vec_slo equivalent.

here sample program shifting contents 1 byte left:

void test(void *buf, void *buf1) {     vector unsigned int x;     vector unsigned int a;      x = vec_ld(0, (vector unsigned int *)buf);     = vec_ld(0, (vector unsigned int *)buf1);      vec_slo(x, a); }  int main() {     char buf[17]="1111111111111111";     char buf1[17]="0000000000000001";      test(buf, buf1); } 

when compile following error:

line 20.1: 1506-930 (s) function "vec_slo" not type-generic macro. 

the second argument vec_slo needs vector signed char or vector unsigned char. change:

vector unsigned int a; 

to:

vector unsigned char a; 

and change:

a = vec_ld(0, (vector unsigned int *)buf1); 

to:

a = vec_ld(0, (vector unsigned char *)buf1); 

there couple of other problems code you'll see when compile , run:

• buf , buf1 need 16 byte aligned
• the value shift in buf1 needs 4 bit literal integer shifted left 3 bits, not character

here simplified/corrected version of example code - it's written gcc may need minor changes whatever compiler using (xlc ?):

int main(void) {     vector unsigned char v = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 };     vector unsigned char vshift = vec_splat_u8(1 << 3);   // shift left 1 byte     vector unsigned char vshifted = vec_slo(v, vshift);      printf("v        = %vu\n", v);     printf("vshift   = %vu\n", vshift);     printf("vshifted = %vu\n", vshifted);      return 0; }