sub_group_broadcast - don't emit second move for uniform destination

If sub_group_broadcast can't be executed with one indirect register access, but destination is uniform, emit one SIMD1 indirect access.
intel · Sep 4, 2023 · 5936b97 · 5936b97
1 parent fe6f3a3
commit 5936b97
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/IGC/Compiler/CISACodeGen/EmitVISAPass.cpp b/IGC/Compiler/CISACodeGen/EmitVISAPass.cpp
@@ -5224,7 +5224,8 @@ void EmitPass::emitSimdShuffle(llvm::Instruction* inst)
             m_encoder->Copy(m_destination, pDstArrElm);
             m_encoder->Push();
 
-            if (!channelUniform)
+            // If destination is uniform, don't execute second half.
+            if (!channelUniform && !m_destination->IsUniform())
             {
 
                 m_encoder->SetSimdSize(SIMDMode::SIMD16);