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// for-break.slang
// Test active mask synthesis for a `for` loop that
// has no ordinary exit condition and can thus
// only be exited via a (single) `break`.
//DISABLE_TEST(compute):COMPARE_COMPUTE_EX:-cpu -compute
//DISABLE_TEST(compute):COMPARE_COMPUTE_EX:-slang -compute
//DISABLE_TEST(compute):COMPARE_COMPUTE_EX:-slang -compute -dx12 -profile cs_6_0 -xslang -DHACK
//DISABLE_TEST(compute, vulkan):COMPARE_COMPUTE_EX:-vk -compute -xslang -DHACK
//TEST(compute):COMPARE_COMPUTE_EX:-cuda -compute -capability cuda_sm_7_0
//TEST_INPUT:ubuffer(data=[0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0], stride=4):out,name buffer
RWStructuredBuffer<int> buffer;
#define THREAD_COUNT 4
#define LOC_COUNT 4
#define ITER_COUNT THREAD_COUNT
#define WRITE(LOC, ITER) buffer[tid + (LOC)*THREAD_COUNT + (ITER)*THREAD_COUNT*LOC_COUNT] = 0xA0000000 | (tid << 24) | (ITER << 16) | (LOC << 8) | WaveGetActiveMask()
//TEST_INPUT:cbuffer(data=[0 1]):name C
cbuffer C
{
int alwaysFalse;
int alwaysTrue;
}
void test(int tid)
{
int ii = 0;
for(;;)
{
WRITE(0, ii);
if(ii >= tid)
{
WRITE(1, ii);
// Note: This flag has been included to force
// D3D and Vulkan implementations to provide
// the expected/desired behavior for the active
// mask in the preceding code.
//
// It seems that without making the `break`
// conditional, some implementation will see that
// this block post-dominates the entire loop,
// and thus decide that the code is semantically
// "outside" the loop, despite the fact that
// it is clearly lexically *inside* the loop.
//
// Making the `break` conditional introduces
// a new control-flow edge that changes the
// post-dominator relationship and thus makes
// such implementations see this code as being
// "inside" the loop again.
//
#ifdef HACK
if(alwaysTrue)
#endif
break;
}
WRITE(2, ii);
ii++;
}
WRITE(3, ITER_COUNT);
}
[numthreads(THREAD_COUNT, 1, 1)]
void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
{
test(dispatchThreadID.x);
}
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