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[DirectX] Implement memcpy in DXIL CBuffer Access pass #144436

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Merged
merged 10 commits into from
Jun 30, 2025
+419 −67
Merged

[DirectX] Implement memcpy in DXIL CBuffer Access pass #144436

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f1988f4
Expect only Load and GEP users of Globals, and report error otherwise
Icohedron Jun 2, 2025
c24411f
Refactor DXIL CBuffer Access pass
Icohedron Jun 13, 2025
b96adb5
Implement memcpy in DXIL CBuffer Access
Icohedron Jun 16, 2025
6ab934d
Add comment explaining CopyElemsImpl function
Icohedron Jun 16, 2025
14ce485
Add test for 0 byte copy and copy one element. Fix 0 byte copy implem…
Icohedron Jun 20, 2025
7a3dbe2
Move recursive lambda to a module-level function
Icohedron Jun 30, 2025
85148e3
Use an llvm_unreachable for unexpected user of global error
Icohedron Jun 30, 2025
2d7b780
Early return loadValue if loading only one element
Icohedron Jun 30, 2025
eefb7f4
Apply clang-format
Icohedron Jun 30, 2025
70fb42a
Remove redundant includes
Icohedron Jun 30, 2025
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10 changes: 9 additions & 1 deletion llvm/lib/Target/DirectX/DXILCBufferAccess.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -11,9 +11,12 @@
#include "llvm/Frontend/HLSL/CBuffer.h"
#include "llvm/Frontend/HLSL/HLSLResource.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/IntrinsicsDirectX.h"
#include "llvm/IR/Operator.h"
#include "llvm/InitializePasses.h"
#include "llvm/Pass.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Transforms/Utils/Local.h"

#define DEBUG_TYPE "dxil-cbuffer-access"
Expand Down Expand Up @@ -161,7 +164,12 @@ static void replaceAccessesWithHandle(GlobalVariable *Global,
}

// Otherwise, walk users looking for a load...
ToProcess.append(Cur->user_begin(), Cur->user_end());
if (isa<GetElementPtrInst>(Cur) || isa<GEPOperator>(Cur)) {
ToProcess.append(Cur->user_begin(), Cur->user_end());
continue;
}

reportFatalInternalError("Unexpected user of Global");
}
RecursivelyDeleteTriviallyDeadInstructions(DeadInsts);
}
Expand Down