[llvm-branch-commits] [llvm] [DirectX] Fix resource binding analysis incorrectly removing duplicates (PR #152253)

[Justin Bogner via llvm-branch-commits]

bogner wrote:

> This should be testable with a unit test in llvm/unittests/Fronted/HLSLBindingTest.cpp rather than via an assert in DXILPostOptimizationValidation

Something like this should catch it I think:

```c++
TEST(HLSLBindingTest, TestNoOverlapWithDuplicates) {
  hlsl::BindingInfoBuilder Builder;

  // We add the same binding three times, and just use `nullptr` for the cookie
  // so that they should all be uniqued away.
  Builder.trackBinding(ResourceClass::SRV, /*Space=*/0, /*LowerBound=*/5,
                       /*UpperBound=*/5, /*Cookie=*/nullptr);
  Builder.trackBinding(ResourceClass::SRV, /*Space=*/0, /*LowerBound=*/5,
                       /*UpperBound=*/5, /*Cookie=*/nullptr);
  Builder.trackBinding(ResourceClass::SRV, /*Space=*/0, /*LowerBound=*/5,
                       /*UpperBound=*/5, /*Cookie=*/nullptr);
  bool HasOverlap;
  hlsl::BindingInfo Info = Builder.calculateBindingInfo(HasOverlap);

  EXPECT_FALSE(HasOverlap);
}
```

https://github.com/llvm/llvm-project/pull/152253