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//TEST(compute):COMPARE_COMPUTE(filecheck-buffer=CHECK):-cpu
// Default packing keeps all fields in one backing field when they fit
// struct MixedSizes { uint8_t a:4; uint8_t b:4; uint16_t c:8; uint16_t d:8; }
// All packed in single uint32_t backing:
// bits 0-3: a (0xA)
// bits 4-7: b (0xB)
// bits 8-15: c (0xCD)
// bits 16-23: d (0xEF)
// Expected: 0x00EFCDBA (top 8 bits unused)
// CHECK: EFCDBA
//TEST_INPUT:ubuffer(data=[0], stride=4):out,name=outputBuffer
RWStructuredBuffer<uint> outputBuffer;
struct MixedSizes {
uint8_t a : 4; // bits 0-3
uint8_t b : 4; // bits 4-7
uint16_t c : 8; // bits 8-15
uint16_t d : 8; // bits 16-23
};
[numthreads(1, 1, 1)]
void computeMain()
{
MixedSizes m;
m.a = 0xA;
m.b = 0xB;
m.c = 0xCD;
m.d = 0xEF;
// With default packing, all fields are in one backing field
outputBuffer[0] = *((uint*)&m) & 0xFFFFFF; // Mask to 24 bits
}
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