#35 pow doesn't work

[GEN]

This works-

kernel void pi_GregoryLeibniz(float size, out float output<>
{
float2 pos = indexof(output).xy;
float i = size * pos.x + pos.y;
int x;
float temp=1.0f;

//output = (pow(-1.0f, i)) * (4.0f / (1.0f + 2.0f * i));

for(x=0;x<(int)i;x++)
{
temp *=-1.0f;
}
output = temp*(4.0f / (1.0f + 2.0f * i));
}

But, this doesn't-

kernel void pi_GregoryLeibniz(float size, out float output<>
{
float2 pos = indexof(output).xy;
float i = size * pos.x + pos.y;
output = pow(-1.0f, i) * (4.0f / (1.0f + 2.0f * i));
}

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