[llvm] 457c9ae - [TableGen] Simplify how we calculate NumMIOperands in addDagOperandMapping. NFC

[Craig Topper via llvm-commits]

Author: Craig Topper
Date: 2025-06-27T14:58:39-07:00
New Revision: 457c9aec9e845d09202ed8de83be122b9b58d2d7

URL: https://github.com/llvm/llvm-project/commit/457c9aec9e845d09202ed8de83be122b9b58d2d7
DIFF: https://github.com/llvm/llvm-project/commit/457c9aec9e845d09202ed8de83be122b9b58d2d7.diff

LOG: [TableGen] Simplify how we calculate NumMIOperands in addDagOperandMapping. NFC

We can use the MIOperandNo and NumMIOperands from the last operand
instead using a loop.

Added: 
    

Modified: 
    llvm/utils/TableGen/CompressInstEmitter.cpp

Removed: 
    


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diff  --git a/llvm/utils/TableGen/CompressInstEmitter.cpp b/llvm/utils/TableGen/CompressInstEmitter.cpp
index 4e307c6504c86..9da64365bc361 100644
--- a/llvm/utils/TableGen/CompressInstEmitter.cpp
+++ b/llvm/utils/TableGen/CompressInstEmitter.cpp
@@ -212,8 +212,9 @@ void CompressInstEmitter::addDagOperandMapping(const Record *Rec,
                                                bool IsSourceInst,
                                                unsigned *SourceLastTiedOpPtr) {
   unsigned NumMIOperands = 0;
-  for (const auto &Op : Inst.Operands)
-    NumMIOperands += Op.MINumOperands;
+  if (!Inst.Operands.empty())
+    NumMIOperands =
+        Inst.Operands.back().MIOperandNo + Inst.Operands.back().MINumOperands;
   OperandMap.grow(NumMIOperands);
 
   // TiedCount keeps track of the number of operands skipped in Inst