/// none is found.
int findFirstPredOperandIdx() const;
+ /// findInlineAsmFlagIdx() - Find the index of the flag word operand that
+ /// corresponds to operand OpIdx on an inline asm instruction. Returns -1 if
+ /// getOperand(OpIdx) does not belong to an inline asm operand group.
+ ///
+ /// If GroupNo is not NULL, it will receive the number of the operand group
+ /// containing OpIdx.
+ ///
+ /// The flag operand is an immediate that can be decoded with methods like
+ /// InlineAsm::hasRegClassConstraint().
+ ///
+ int findInlineAsmFlagIdx(unsigned OpIdx, unsigned *GroupNo = 0) const;
+
/// isRegTiedToUseOperand - Given the index of a register def operand,
/// check if the register def is tied to a source operand, due to either
/// two-address elimination or inline assembly constraints. Returns the
return false;
}
+int MachineInstr::findInlineAsmFlagIdx(unsigned OpIdx,
+ unsigned *GroupNo) const {
+ assert(isInlineAsm() && "Expected an inline asm instruction");
+ assert(OpIdx < getNumOperands() && "OpIdx out of range");
+
+ // Ignore queries about the initial operands.
+ if (OpIdx < InlineAsm::MIOp_FirstOperand)
+ return -1;
+
+ unsigned Group = 0;
+ unsigned NumOps;
+ for (unsigned i = InlineAsm::MIOp_FirstOperand, e = getNumOperands(); i < e;
+ i += NumOps) {
+ const MachineOperand &FlagMO = getOperand(i);
+ // If we reach the implicit register operands, stop looking.
+ if (!FlagMO.isImm())
+ return -1;
+ NumOps = 1 + InlineAsm::getNumOperandRegisters(FlagMO.getImm());
+ if (i + NumOps > OpIdx) {
+ if (GroupNo)
+ *GroupNo = Group;
+ return i;
+ }
+ ++Group;
+ }
+ return -1;
+}
+
/// findRegisterUseOperandIdx() - Returns the MachineOperand that is a use of
/// the specific register or -1 if it is not found. It further tightens
/// the search criteria to a use that kills the register if isKill is true.
return false;
// Determine the actual operand index that corresponds to this index.
unsigned DefNo = 0;
- unsigned DefPart = 0;
- for (unsigned i = InlineAsm::MIOp_FirstOperand, e = getNumOperands();
- i < e; ) {
- const MachineOperand &FMO = getOperand(i);
- // After the normal asm operands there may be additional imp-def regs.
- if (!FMO.isImm())
- return false;
- // Skip over this def.
- unsigned NumOps = InlineAsm::getNumOperandRegisters(FMO.getImm());
- unsigned PrevDef = i + 1;
- i = PrevDef + NumOps;
- if (i > DefOpIdx) {
- DefPart = DefOpIdx - PrevDef;
- break;
- }
- ++DefNo;
- }
+ int FlagIdx = findInlineAsmFlagIdx(DefOpIdx, &DefNo);
+ if (FlagIdx < 0)
+ return false;
+
+ // Which part of the group is DefOpIdx?
+ unsigned DefPart = DefOpIdx - (FlagIdx + 1);
+
for (unsigned i = InlineAsm::MIOp_FirstOperand, e = getNumOperands();
i != e; ++i) {
const MachineOperand &FMO = getOperand(i);
return false;
// Find the flag operand corresponding to UseOpIdx
- unsigned FlagIdx, NumOps=0;
- for (FlagIdx = InlineAsm::MIOp_FirstOperand;
- FlagIdx < UseOpIdx; FlagIdx += NumOps+1) {
- const MachineOperand &UFMO = getOperand(FlagIdx);
- // After the normal asm operands there may be additional imp-def regs.
- if (!UFMO.isImm())
- return false;
- NumOps = InlineAsm::getNumOperandRegisters(UFMO.getImm());
- assert(NumOps < getNumOperands() && "Invalid inline asm flag");
- if (UseOpIdx < FlagIdx+NumOps+1)
- break;
- }
- if (FlagIdx >= UseOpIdx)
+ int FlagIdx = findInlineAsmFlagIdx(UseOpIdx);
+ if (FlagIdx < 0)
return false;
+
const MachineOperand &UFMO = getOperand(FlagIdx);
unsigned DefNo;
if (InlineAsm::isUseOperandTiedToDef(UFMO.getImm(), DefNo)) {