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Allow InstAlias's to use immediate matcher patterns that xform the value.

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For example,

On ARM, "mov r3, #-3" is an alias for "mvn r3, #2", so we want to use a
matcher pattern that handles the bitwise negation when mapping to t2MVNi.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@143233 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Grosbach
2011-10-28 22:32:53 +00:00
parent 017f87cf68
commit 48c1f84b10
2 changed files with 29 additions and 5 deletions
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21
utils/TableGen/CodeGenInstruction.cpp
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@ -428,8 +428,11 @@ bool CodeGenInstAlias::tryAliasOpMatch(DagInit *Result, unsigned AliasOpNo,
if (ADI && ADI->getDef()->isSubClassOf("RegisterClass")) {
if (!InstOpRec->isSubClassOf("RegisterClass"))
return false;
return T.getRegisterClass(InstOpRec)
.hasSubClass(&T.getRegisterClass(ADI->getDef()));
if (!T.getRegisterClass(InstOpRec)
.hasSubClass(&T.getRegisterClass(ADI->getDef())))
return false;
ResOp = ResultOperand(Result->getArgName(AliasOpNo), ADI->getDef());
return true;
}
// Handle explicit registers.
@ -473,6 +476,7 @@ bool CodeGenInstAlias::tryAliasOpMatch(DagInit *Result, unsigned AliasOpNo,
return true;
}
// Literal integers.
if (IntInit *II = dynamic_cast<IntInit*>(Arg)) {
if (hasSubOps || !InstOpRec->isSubClassOf("Operand"))
return false;
@ -484,6 +488,19 @@ bool CodeGenInstAlias::tryAliasOpMatch(DagInit *Result, unsigned AliasOpNo,
return true;
}
// If both are Operands with the same MVT, allow the conversion. It's
// up to the user to make sure the values are appropriate, just like
// for isel Pat's.
if (InstOpRec->isSubClassOf("Operand") &&
ADI->getDef()->isSubClassOf("Operand")) {
// FIXME: What other attributes should we check here? Identical
// MIOperandInfo perhaps?
if (InstOpRec->getValueInit("Type") != ADI->getDef()->getValueInit("Type"))
return false;
ResOp = ResultOperand(Result->getArgName(AliasOpNo), ADI->getDef());
return true;
}
return false;
}