From: Evan Cheng <evan.cheng@apple.com>
Date: Thu, 28 Oct 2010 01:46:29 +0000 (+0000)
Subject: Fix a major bug in operand latency computation. The use index must be adjusted
X-Git-Url: http://plrg.eecs.uci.edu/git/?p=oota-llvm.git;a=commitdiff_plain;h=7c88cdcc3ba49101fa119ec3b403e9980934384e

Fix a major bug in operand latency computation. The use index must be adjusted
by the number of defs first for it to match the instruction itinerary.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@117518 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp b/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp
index 0ffb4da0f36..d34a52d8014 100644
--- a/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp
+++ b/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp
@@ -454,6 +454,9 @@ void ScheduleDAGSDNodes::ComputeOperandLatency(SDNode *Def, SDNode *Use,
     return;
 
   unsigned DefIdx = Use->getOperand(OpIdx).getResNo();
+  if (Use->isMachineOpcode())
+    // Adjust the use operand index by num of defs.
+    OpIdx += TII->get(Use->getMachineOpcode()).getNumDefs();
   int Latency = TII->getOperandLatency(InstrItins, Def, DefIdx, Use, OpIdx);
   if (Latency >= 0)
     dep.setLatency(Latency);