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| author | Dan Gohman <gohman@apple.com> | 2009-03-23 17:39:36 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2009-03-23 17:39:36 +0000 |
| commit | 8cccf0ef0ced7f4d75ca574b596036a9b6cd4315 (patch) | |
| tree | f4320254eda5b94ffed22421f4aa5ceb2fbc8179 /lib | |
| parent | a5c8ae233ebaef270b8fa96565ca7bf4fdcb3e15 (diff) | |
| download | external_llvm-8cccf0ef0ced7f4d75ca574b596036a9b6cd4315.zip external_llvm-8cccf0ef0ced7f4d75ca574b596036a9b6cd4315.tar.gz external_llvm-8cccf0ef0ced7f4d75ca574b596036a9b6cd4315.tar.bz2 | |
Don't set SUnit::hasPhysRegDefs to true unless the defs are
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
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp b/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp index 303f8cc..7aa15bc 100644 --- a/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp +++ b/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp @@ -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; } |