[llvm] [AMDGPU] Add intrinsic and MI for image_bvh_dual_intersect_ray (PR #130038)

[Matt Arsenault via llvm-commits]

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@@ -7183,6 +7183,57 @@ bool AMDGPULegalizerInfo::legalizeBVHIntersectRayIntrinsic(
   return true;
 }
 
+bool AMDGPULegalizerInfo::legalizeBVHDualIntrinsic(MachineInstr &MI,
+                                                   MachineIRBuilder &B) const {
+  const LLT S32 = LLT::scalar(32);
+  const LLT V2S32 = LLT::fixed_vector(2, 32);
+
+  Register DstReg = MI.getOperand(0).getReg();
+  Register DstOrigin = MI.getOperand(1).getReg();
+  Register DstDir = MI.getOperand(2).getReg();
+  Register NodePtr = MI.getOperand(4).getReg();
+  Register RayExtent = MI.getOperand(5).getReg();
+  Register InstanceMask = MI.getOperand(6).getReg();
+  Register RayOrigin = MI.getOperand(7).getReg();
+  Register RayDir = MI.getOperand(8).getReg();
+  Register Offsets = MI.getOperand(9).getReg();
+  Register TDescr = MI.getOperand(10).getReg();
+
+  if (!AMDGPU::isGFX12Plus(ST)) {
+    DiagnosticInfoUnsupported BadIntrin(B.getMF().getFunction(),
+                                        "intrinsic not supported on subtarget",
+                                        MI.getDebugLoc());
+    B.getMF().getFunction().getContext().diagnose(BadIntrin);
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arsenm wrote:

Untested error, and I don't see the same in the dag path 

https://github.com/llvm/llvm-project/pull/130038