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-rw-r--r--llvm/utils/TableGen/CodeGenTarget.cpp10
1 files changed, 10 insertions, 0 deletions
diff --git a/llvm/utils/TableGen/CodeGenTarget.cpp b/llvm/utils/TableGen/CodeGenTarget.cpp
index e87ffb730ec..42fbb986747 100644
--- a/llvm/utils/TableGen/CodeGenTarget.cpp
+++ b/llvm/utils/TableGen/CodeGenTarget.cpp
@@ -393,6 +393,16 @@ ComplexPattern::ComplexPattern(Record *R) {
SelectFunc = R->getValueAsString("SelectFunc");
RootNodes = R->getValueAsListOfDefs("RootNodes");
+ // FIXME: This is a hack to statically increase the priority of patterns which
+ // maps a sub-dag to a complex pattern. e.g. favors LEA over ADD. To get best
+ // possible pattern match we'll need to dynamically calculate the complexity
+ // of all patterns a dag can potentially map to.
+ int64_t RawComplexity = R->getValueAsInt("Complexity");
+ if (RawComplexity == -1)
+ Complexity = NumOperands * 3;
+ else
+ Complexity = RawComplexity;
+
// Parse the properties.
Properties = 0;
std::vector<Record*> PropList = R->getValueAsListOfDefs("Properties");
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