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Implement enough of the missing instalias support to get

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aliases installed and working.  They now work when the
matched pattern and the result instruction have exactly
the same operand list.

This is now enough for us to define proper aliases for
movzx and movsx, implementing rdar://8017633 and PR7459.

Note that we do not accept instructions like:
  movzx 0(%rsp), %rsi

GAS accepts this instruction, but it doesn't make any
sense because we don't know the size of the memory
operand.  It could be 8/16/32 bits.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@117901 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2010-11-01 05:34:34 +00:00
parent b8d14a6611
commit b501d4f673
6 changed files with 96 additions and 16 deletions
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utils/TableGen/CodeGenInstruction.cpp
+7 -6
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@@ -110,6 +110,12 @@ CGIOperandList::CGIOperandList(Record *R) : TheDef(R) {
MIOperandNo, NumOps, MIOpInfo));
MIOperandNo += NumOps;
}
// Make sure the constraints list for each operand is large enough to hold
// constraint info, even if none is present.
for (unsigned i = 0, e = OperandList.size(); i != e; ++i)
OperandList[i].Constraints.resize(OperandList[i].MINumOperands);
}
@@ -235,11 +241,6 @@ static void ParseConstraint(const std::string &CStr, CGIOperandList &Ops) {
}
static void ParseConstraints(const std::string &CStr, CGIOperandList &Ops) {
// Make sure the constraints list for each operand is large enough to hold
// constraint info, even if none is present.
for (unsigned i = 0, e = Ops.size(); i != e; ++i)
Ops[i].Constraints.resize(Ops[i].MINumOperands);
if (CStr.empty()) return;
const std::string delims(",");
@@ -390,5 +391,5 @@ FlattenAsmStringVariants(StringRef Cur, unsigned Variant) {
CodeGenInstAlias::CodeGenInstAlias(Record *R) : TheDef(R), Operands(R) {
AsmString = R->getValueAsString("AsmString");
Result = R->getValueAsDag("ResultInst");
}