[llvm] [SPIRV] Add reads from image buffer for shaders. (PR #115178)

[Steven Perron via llvm-commits]

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@@ -2803,6 +2816,83 @@ void SPIRVInstructionSelector::selectHandleFromBinding(Register &ResVReg,
       .addUse(VarReg);
 }
 
+void SPIRVInstructionSelector::selectReadImageIntrinsic(
+    Register &ResVReg, const SPIRVType *ResType, MachineInstr &I) const {
+
+  // If the load of the image is in a different basic block, then
+  // this will generate invalid code. A proper solution is to move
+  // the OpLoad from selectHandleFromBinding here. However, to do
+  // that we will need to change the return type of the intrinsic.
+  // We will do that when we can, but for now trying to move forward with other
+  // issues.
+  Register ImageReg = I.getOperand(2).getReg();
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s-perron wrote:

Done

https://github.com/llvm/llvm-project/pull/115178