yum-mirror/slang

Making it easier to work with shaders

git clone https://git.yummers.dev/yum-mirror/slang

Yong HeFix IR lowering bug of do-while loops. (#3941)b937207dc

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1// A regression: the do-while loop ir lowering logic is making incorrect assumptions and is
2// broken after short circuiting expr change, leading to invalid IR being generated from lowering
3// (a block has two terminator insts).
4
5//TEST:SIMPLE(filecheck=CHECK): -target spirv -emit-spirv-directly
6
7// CHECK: OpEntryPoint
8
9struct Constants {
10  uint *buffer;
11}
12[[vk::push_constant]] Constants push_constants;
13
14[shader("compute")] [numthreads(1, 1, 1)] void compute(void) {
15  uint index = push_constants.buffer[0];
16
17  [[unroll]] for (uint i = 0; i < 2; i++) {
18    GroupMemoryBarrierWithWaveSync();
19
20    if (index > 0 && i < push_constants.buffer[index - 1]) {
21      do {
22        index--;
23      } while (index > 0 && i < push_constants.buffer[index - 1]);
24    }
25  }
26}