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//TEST(compute):COMPARE_COMPUTE(filecheck-buffer=CHECK):-cpu -output-using-type -compile-arg -msvc-style-bitfield-packing
// MSVC starts new backing fields when type sizes change
// CHECK: 4
// CHECK-NEXT: 12
// CHECK-NEXT: 8
// CHECK-NEXT: 16
//TEST_INPUT:ubuffer(data=[0 0 0 0], stride=4):out,name=outputBuffer
RWStructuredBuffer<uint> outputBuffer;
struct S {
int foo : 8;
int bar : 24;
};
// MSVC will use separate backing fields for different sized types
struct T {
int64_t foo : 33; // Uses int64_t backing
int bar : 24; // Uses separate int backing due to type size change
};
// This still takes two ints to store all the bits
struct P {
int foo : 24;
int bar : 24;
};
// MSVC will use separate backing fields due to type size difference
struct Q {
int8_t foo : 1; // Uses int8_t backing
int64_t bar : 63; // Uses separate int64_t backing
};
[numthreads(1, 1, 1)]
void computeMain()
{
outputBuffer[0] = sizeof(S);
outputBuffer[1] = sizeof(T);
outputBuffer[2] = sizeof(P);
outputBuffer[3] = sizeof(Q);
}
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