I'm trying to come up with a definition of Vector4 that wouldn't make ispc
generate performance warnings wrt gather/scatter:
https://ispc.godbolt.org/z/ctMCVa
Can anyone show me a Vector4 (or Vector3) struct that is warning-free?
Here are my tests, all resulting in warnings:
struct Vector4
{
float X, Y, Z, W;
};
struct Vector4A
{
float V[4];
};
struct Vector4SOA
{
float<4> V;
};
export void SOATest(uniform Vector4SOA outs[], uniform Vector4SOA ins[],
uniform int count)
{
foreach (i = 0 ... count)
{
Vector4SOA vv = ins[i];
vv.V[0]++;
outs[i] = vv;
}
}
export void ATest(uniform Vector4A outs[], uniform Vector4A ins[], uniform
int count)
{
foreach (i = 0 ... count)
{
Vector4A vv = ins[i];
vv.V[0]++;
outs[i] = vv;
}
}
export void Test(uniform Vector4 outs[], uniform Vector4 ins[], uniform int
count)
{
foreach (i = 0 ... count)
{
Vector4 vv = ins[i];
vv.X++;
outs[i] = vv;
}
}
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