/// read. This is only ever set for an output operand.
bool isEarlyClobber;
- /// hasMatchingInput - This is set to true for an output constraint iff
- /// there is an input constraint that is required to match it (e.g. "0").
- bool hasMatchingInput;
+ /// MatchingInput - If this is not -1, this is an output constraint where an
+ /// input constraint is required to match it (e.g. "0"). The value is the
+ /// constraint number that matches this one (for example, if this is
+ /// constraint #0 and constraint #4 has the value "0", this will be 4).
+ signed char MatchingInput;
+
+ /// hasMatchingInput - Return true if this is an output constraint that has
+ /// a matching input constraint.
+ bool hasMatchingInput() const { return MatchingInput != -1; }
/// isCommutative - This is set to true for a constraint that is commutative
/// with the next operand.
static inline bool classof(const Value *V) {
return V->getValueID() == Value::InlineAsmVal;
}
+
+ /// getNumOperandRegisters - Extract the number of registers field from the
+ /// inline asm operand flag.
+ static unsigned getNumOperandRegisters(unsigned Flag) {
+ return (Flag & 0xffff) >> 3;
+ }
+
+ /// isUseOperandTiedToDef - Return true if the flag of the inline asm
+ /// operand indicates it is an use operand that's matched to a def operand.
+ static bool isUseOperandTiedToDef(unsigned Flag, unsigned &Idx) {
+ if ((Flag & 0x80000000) == 0)
+ return false;
+ Idx = (Flag & ~0x80000000) >> 16;
+ return true;
+ }
+
+
};
} // End llvm namespace