[clang] [llvm] [HLSL][SPIRV]Add SPIRV generation for HLSL dot (PR #104656)

[Greg Roth via cfe-commits]

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@@ -1446,6 +1452,90 @@ bool SPIRVInstructionSelector::selectRsqrt(Register ResVReg,
       .constrainAllUses(TII, TRI, RBI);
 }
 
+// Select the OpDot instruction for the given float dot
+bool SPIRVInstructionSelector::selectFloatDot(Register ResVReg,
+                                              const SPIRVType *ResType,
+                                              MachineInstr &I) const {
+  assert(I.getNumOperands() == 4);
+  assert(I.getOperand(2).isReg());
+  assert(I.getOperand(3).isReg());
+
+  [[maybe_unused]] SPIRVType *VecType =
+      GR.getSPIRVTypeForVReg(I.getOperand(2).getReg());
+
+  assert(GR.getScalarOrVectorComponentCount(VecType) > 1 &&
+         "dot product requires a vector of at least 2 components");
+
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pow2clk wrote:

Done

https://github.com/llvm/llvm-project/pull/104656