SSE4.1 intrinsics compilation error on Mac

Question

I'm having some trouble using SSE4.1 intrinsics on hardware that (I think) supports it. Can anyone tell me if I've missed something?

Building the following code on a MacBookPro5,4 (Penryn):

>g++ -msse sse4.cpp -S -o sse4.asm

#include <stdio.h>
#include <smmintrin.h>

int main ()
{
    __m128 a, b;
    const int mask = 0x55;

    a.m128_f32[0] = 1.5;
    a.m128_f32[1] = 10.25;
    a.m128_f32[2] = -11.0625;
    a.m128_f32[3] = 81.0;
    b.m128_f32[0] = -1.5;
    b.m128_f32[1] = 3.125;
    b.m128_f32[2] = -50.5;
    b.m128_f32[3] = 100.0;

    __m128 res = _mm_dp_ps(a, b, mask);

    printf_s("Original a: %f\t%f\t%f\t%f\nOriginal b: %f\t%f\t%f\t%f\n",
                a.m128_f32[0], a.m128_f32[1], a.m128_f32[2], a.m128_f32[3],
                b.m128_f32[0], b.m128_f32[1], b.m128_f32[2], b.m128_f32[3]);
    printf_s("Result res: %f\t%f\t%f\t%f\n",
                res.m128_f32[0], res.m128_f32[1], res.m128_f32[2], res.m128_f32[3]);

    return 0;
}

Generates the following error:

/usr/lib/gcc/i686-apple-darwin10/4.2.1/include/smmintrin.h:35:3: error: #error "SSE4.1 instruction set not enabled"

Answer 1

Change:

g++ -msse sse4.cpp -S -o sse4.asm

to:

g++ -msse4.1 sse4.cpp -S -o sse4.asm

Answer 2

Did you try g++ -msse4.1 ?