Eliminate samples with the same texture coordinates

iwwu · igcbot · commit 7b8b6da4dffa · 2025-08-28T01:03:46.000+02:00
Adding ReassociatePass before GVN pass ensures the second sample gets
eliminated.
diff --git a/IGC/Compiler/CISACodeGen/ShaderCodeGen.cpp b/IGC/Compiler/CISACodeGen/ShaderCodeGen.cpp
@@ -1411,6 +1411,9 @@ void OptimizeIR(CodeGenContext *const pContext) {
       if (IGC_IS_FLAG_ENABLED(OCLEnableReassociate) && pContext->type == ShaderType::OPENCL_SHADER) {
         mpm.add(createReassociatePass());
       }
+      if (pContext->type == ShaderType::COMPUTE_SHADER) {
+        mpm.add(llvm::createReassociatePass());
+      }
 
       mpm.add(createPromoteConstantStructsPass());
 

Original file line number	Diff line number	Diff line change
`@@ -1411,6 +1411,9 @@ void OptimizeIR(CodeGenContext *const pContext) {`
`1411`	`1411`	`if (IGC_IS_FLAG_ENABLED(OCLEnableReassociate) && pContext->type == ShaderType::OPENCL_SHADER) {`
`1412`	`1412`	`mpm.add(createReassociatePass());`
`1413`	`1413`	`}`
	`1414`	`+ if (pContext->type == ShaderType::COMPUTE_SHADER) {`
	`1415`	`+ mpm.add(llvm::createReassociatePass());`
	`1416`	`+ }`
`1414`	`1417`
`1415`	`1418`	`mpm.add(createPromoteConstantStructsPass());`
`1416`	`1419`