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add an optimized form of OPC_EmitMergeInputChains for the 1, 0 and

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1, 1 cases which are by-far the most frequent.  This shrinks the X86
isel table from 77014 -> 74657 bytes.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@99740 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2010-03-28 05:50:16 +00:00
parent 856fb395e4
commit aa4e3391c8
3 changed files with 38 additions and 0 deletions
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7
utils/TableGen/DAGISelMatcherEmitter.cpp
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@@ -449,6 +449,13 @@ EmitMatcher(const Matcher *N, unsigned Indent, unsigned CurrentIdx,
case Matcher::EmitMergeInputChains: {
const EmitMergeInputChainsMatcher *MN =
cast<EmitMergeInputChainsMatcher>(N);
// Handle the specialized forms OPC_EmitMergeInputChains1_0 and 1_1.
if (MN->getNumNodes() == 1 && MN->getNode(0) < 2) {
OS << "OPC_EmitMergeInputChains1_" << MN->getNode(0) << ",\n";
return 1;
}
OS << "OPC_EmitMergeInputChains, " << MN->getNumNodes() << ", ";
for (unsigned i = 0, e = MN->getNumNodes(); i != e; ++i)
OS << MN->getNode(i) << ", ";