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// Disabled because Slang IR path is missing support for [fastopt]
//TEST_IGNORE_FILE
//TEST:COMPARE_HLSL: -profile vs_4_0
// Confirm that we pass through `[fastopt]` attributes
//
// This shader does indexing into the elements of
// a vector, fetched from a `cbuffer`, based on
// a loop counter (or a loop with a small trip
// count), so `fxc` seems to want to unroll the
// loop. The `[fastopt]` attribute changes this
// behavior and results in a `loop` instruction
// in the DX bytecode, so we can use this to
// test whether Slang is passing through the
// attribute or not.
// Import Slang code so that we aren't just in
// the 100% pass-through mode.
#ifdef __SLANG__
__import empty;
#endif
cbuffer C
{
float4 b[4];
}
float test(float x, float c)
{
[fastopt]
for(int ii = 0; ii < 2; ++ii)
{
x = x*x + c + b[ii][ii];
}
return x;
}
float4 main(float4 a : A) : SV_Position
{
a.x = test(a.x, a.y);
return a;
}
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