[PIX] Instrument DebugBreak() calls for PIX

[henchhinglimbu]

Changes:

• Add a PIX DXIL pass that replaces DebugBreak() calls with UAV atomic writes so PIX can detect hit locations without halting
  execution.
• Wire the new pass into pass registration and the build.
• Add unit tests and FileCheck coverage for basic, no DebugBreak(), and multiple DebugBreak() cases.

Testing:

• Built dxcompiler, ClangHLSLTests, and check-all
• check-all passed locally

Co-authored-by: Copilot 223556219+Copilot@users.noreply.github.com

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[github-actions]

⚠️ C/C++ code formatter, clang-format found issues in your code. ⚠️

You can test this locally with the following command:

git-clang-format --diff 33656f65c2fd735647ed10448b1fa3ca7b1f2e48 7211c61a71f087792c63d6d6e7f3bf83b0c6509b -- lib/DxilPIXPasses/DxilDebugBreakInstrumentation.cpp include/dxc/DxilPIXPasses/DxilPIXPasses.h tools/clang/unittests/HLSL/PixTest.cpp

View the diff from clang-format here.

diff --git a/lib/DxilPIXPasses/DxilDebugBreakInstrumentation.cpp b/lib/DxilPIXPasses/DxilDebugBreakInstrumentation.cpp
index 6f727c46..896d0689 100644
--- a/lib/DxilPIXPasses/DxilDebugBreakInstrumentation.cpp
+++ b/lib/DxilPIXPasses/DxilDebugBreakInstrumentation.cpp
@@ -47,8 +47,7 @@ bool DxilDebugBreakInstrumentation::runOnModule(Module &M) {
       HlslOP->GetOpFunc(OP::OpCode::AtomicBinOp, Type::getInt32Ty(Ctx));
   Constant *AtomicBinOpcode =
       HlslOP->GetU32Const((uint32_t)OP::OpCode::AtomicBinOp);
-  Constant *AtomicOr =
-      HlslOP->GetU32Const((uint32_t)DXIL::AtomicBinOpCode::Or);
+  Constant *AtomicOr = HlslOP->GetU32Const((uint32_t)DXIL::AtomicBinOpCode::Or);
 
   std::map<Function *, CallInst *> FunctionToUAVHandle;
 
@@ -101,8 +100,7 @@ bool DxilDebugBreakInstrumentation::runOnModule(Module &M) {
     const uint32_t InstructionNumBitPosition = (InstructionNumber % 32u);
     const uint32_t InstructionNumBitMask = 1u << InstructionNumBitPosition;
 
-    Constant *UAVByteOffsetArg =
-        HlslOP->GetU32Const(InstructionNumByteOffset);
+    Constant *UAVByteOffsetArg = HlslOP->GetU32Const(InstructionNumByteOffset);
     Constant *BitMaskArg = HlslOP->GetU32Const(InstructionNumBitMask);
 
     // Write a 1 bit at the position corresponding to this DebugBreak's

• Check this box to apply formatting changes to this branch.