Merge pull request #14768 from VermaSh/improve_readability_of_pdshr_e…

…valuator
eclipse-openj9 · Jan 26, 2023 · c9c0e15 · c9c0e15
2 parents ef8817c + 8e700d5
commit c9c0e15
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/runtime/compiler/z/codegen/J9BCDTreeEvaluator.cpp b/runtime/compiler/z/codegen/J9BCDTreeEvaluator.cpp
@@ -6337,10 +6337,12 @@ J9::Z::TreeEvaluator::pdshlVectorEvaluatorHelper(TR::Node *node, TR::CodeGenerat
 
       if (cg->comp()->target().cpu.supportsFeature(OMR_FEATURE_S390_VECTOR_PACKED_DECIMAL_ENHANCEMENT_FACILITY) && cg->getIgnoreDecimalOverflowException())
          {
+         // Write 1 to most significant bit to suppress HW overflow program interrupt
          decimalPrecision |= 0x80;
          }
 
       targetReg = cg->allocateRegister(TR_VRF);
+      // Perform shift and set condition code on overflows
       generateVRIgInstruction(cg, TR::InstOpCode::VSRP, node, targetReg, sourceReg, decimalPrecision, shiftAmount, 0x01);
       }
 
@@ -6382,6 +6384,7 @@ J9::Z::TreeEvaluator::pdshrVectorEvaluatorHelper(TR::Node *node, TR::CodeGenerat
 
    if (cg->comp()->target().cpu.supportsFeature(OMR_FEATURE_S390_VECTOR_PACKED_DECIMAL_ENHANCEMENT_FACILITY) && cg->getIgnoreDecimalOverflowException())
       {
+      // Write 1 to most significant bit to suppress HW overflow program interrupt
       decimalPrecision |= 0x80;
       }