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Don't set SUnit::hasPhysRegDefs to true unless the defs are

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actually have uses, which reflects the way it's used.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@67540 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2009-03-23 17:39:36 +00:00
parent a5c8ae233e
commit 8cccf0ef0c
1 changed files with 4 additions and 1 deletions
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5
lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp
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@ -175,7 +175,10 @@ void ScheduleDAGSDNodes::AddSchedEdges() {
if (N->isMachineOpcode() &&
TII->get(N->getMachineOpcode()).getImplicitDefs()) {
SU->hasPhysRegClobbers = true;
if (CountResults(N) > TII->get(N->getMachineOpcode()).getNumDefs())
unsigned NumUsed = CountResults(N);
while (NumUsed != 0 && !N->hasAnyUseOfValue(NumUsed - 1))
--NumUsed; // Skip over unused values at the end.
if (NumUsed > TII->get(N->getMachineOpcode()).getNumDefs())
SU->hasPhysRegDefs = true;
}