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//TEST(compute):COMPARE_COMPUTE(filecheck-buffer=CHECK):-cpu -compile-arg -msvc-style-bitfield-packing
// MSVC creates separate backing fields for different type sizes
// struct MixedSizes { uint8_t a:4; uint8_t b:4; uint16_t c:8; uint16_t d:8; }
// First backing (uint8_t): a=0xA (bits 4-7), b=0xB (bits 0-3) => 0xAB
// Second backing (uint16_t): c=0xCD (bits 8-15), d=0xEF (bits 0-7) => 0xCDEF
// Memory layout: [0xAB, padding, 0xCDEF] or [0xAB, padding, 0xEF, 0xCD] depending on endianness
// CHECK: AB
// CHECK-NEXT: CDEF
//TEST_INPUT:ubuffer(data=[0 0], stride=4):out,name=outputBuffer
RWStructuredBuffer<uint> outputBuffer;
struct MixedSizes {
uint8_t a : 4; // First backing field (uint8_t)
uint8_t b : 4; // Same backing field
uint16_t c : 8; // New backing field (uint16_t) due to type change
uint16_t d : 8; // Same backing field
};
groupshared MixedSizes m;
typealias GroupSharedPtr<T> = Ptr<T, Access::ReadWrite, AddressSpace::GroupShared>;
[numthreads(1, 1, 1)]
void computeMain()
{
m.a = 0xA;
m.b = 0xB;
m.c = 0xCD;
m.d = 0xEF;
// Read the two backing fields separately
GroupSharedPtr<uint8_t> p8 = (GroupSharedPtr<uint8_t>)__getAddress(m);
GroupSharedPtr<uint16_t> p16 = (GroupSharedPtr<uint16_t>)( ((GroupSharedPtr<uint8_t>)__getAddress(m)) + 2); // Skip uint8_t + padding
outputBuffer[0] = (uint)*p8;
outputBuffer[1] = (uint)*p16;
}
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