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//TEST(compute):COMPARE_COMPUTE(filecheck-buffer=CHECK):-cpu -compile-arg -msvc-style-bitfield-packing
// MSVC style packs from MSB to LSB
// struct S { uint a:4; uint b:8; uint c:4; uint d:16; }
// Memory layout (32-bit):
// bits 28-31: a (0x5)
// bits 20-27: b (0xAB)
// bits 16-19: c (0xC)
// bits 0-15: d (0xDEF0)
// Expected: 0x5ABCDEF0
// CHECK: 5ABCDEF0
//TEST_INPUT:ubuffer(data=[0], stride=4):out,name=outputBuffer
RWStructuredBuffer<uint> outputBuffer;
struct S {
uint a : 4; // bits 28-31 (MSB side)
uint b : 8; // bits 20-27
uint c : 4; // bits 16-19
uint d : 16; // bits 0-15
};
[numthreads(1, 1, 1)]
void computeMain()
{
S s;
s.a = 0x5;
s.b = 0xAB;
s.c = 0xC;
s.d = 0xDEF0;
// Write the struct to memory and read it back as uint
outputBuffer[0] = *((uint*)&s);
}
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