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Teach TableGen to put chains on more instructions

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When generating selection tables for Pat instances, TableGen relied on
an output Instruction's Pattern field being set to infer whether a
chain should be added.

This patch adds additional logic to check various flag fields so that
correct code can be generated even if Pattern is unset.

llvm-svn: 159217
This commit is contained in:
Tim Northover 2012-06-26 18:46:28 +00:00
parent bcb2742394
commit 6b78b4ea43
1 changed files with 7 additions and 0 deletions
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7
utils/TableGen/DAGISelMatcherGen.cpp
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@ -690,6 +690,13 @@ EmitResultInstructionAsOperand(const TreePatternNode *N,
bool NodeHasChain = InstPatNode && bool NodeHasChain = InstPatNode &&
InstPatNode->TreeHasProperty(SDNPHasChain, CGP); InstPatNode->TreeHasProperty(SDNPHasChain, CGP);
// Instructions which load and store from memory should have a chain,
// regardless of whether they happen to have an internal pattern saying so.
if (Pattern.getSrcPattern()->TreeHasProperty(SDNPHasChain, CGP)
&& (II.hasCtrlDep || II.mayLoad || II.mayStore || II.canFoldAsLoad ||
II.hasSideEffects))
NodeHasChain = true;
bool isRoot = N == Pattern.getDstPattern(); bool isRoot = N == Pattern.getDstPattern();
// TreeHasOutGlue - True if this tree has glue. // TreeHasOutGlue - True if this tree has glue.