the registers <tt>EAX</tt>, <tt>AX</tt> and <tt>AL</tt> share the first eight
bits. These physical registers are marked as <i>aliased</i> in LLVM. Given a
particular architecture, you can check which registers are aliased by
- inspecting its <tt>RegisterInfo.td</tt> file. Moreover, the method
- <tt>MCRegisterInfo::getAliasSet(p_reg)</tt> returns an array containing
- all the physical registers aliased to the register <tt>p_reg</tt>.</p>
+ inspecting its <tt>RegisterInfo.td</tt> file. Moreover, the class
+ <tt>MCRegAliasIterator</tt> enumerates all the physical registers aliased to
+ a register.</p>
<p>Physical registers, in LLVM, are grouped in <i>Register Classes</i>.
Elements in the same register class are functionally equivalent, and can be
return operator[](RegNo);
}
- /// getAliasSet - Return the set of registers aliased by the specified
- /// register, or a null list of there are none. The list returned is zero
- /// terminated.
- ///
- const uint16_t *getAliasSet(unsigned RegNo) const {
- // The Overlaps set always begins with Reg itself.
- return RegLists + get(RegNo).Overlaps + 1;
- }
-
- /// getOverlaps - Return a list of registers that overlap Reg, including
- /// itself. This is the same as the alias set except Reg is included in the
- /// list.
- /// These are exactly the registers in { x | regsOverlap(x, Reg) }.
- ///
- const uint16_t *getOverlaps(unsigned RegNo) const {
- return RegLists + get(RegNo).Overlaps;
- }
-
- /// getSubRegisters - Return the list of registers that are sub-registers of
- /// the specified register, or a null list of there are none. The list
- /// returned is zero terminated and sorted according to super-sub register
- /// relations. e.g. X86::RAX's sub-register list is EAX, AX, AL, AH.
- ///
- const uint16_t *getSubRegisters(unsigned RegNo) const {
- return RegLists + get(RegNo).SubRegs;
- }
-
/// getSubReg - Returns the physical register number of sub-register "Index"
/// for physical register RegNo. Return zero if the sub-register does not
/// exist.
return 0;
}
- /// getSuperRegisters - Return the list of registers that are super-registers
- /// of the specified register, or a null list of there are none. The list
- /// returned is zero terminated and sorted according to super-sub register
- /// relations. e.g. X86::AL's super-register list is AX, EAX, RAX.
- ///
- const uint16_t *getSuperRegisters(unsigned RegNo) const {
- return RegLists + get(RegNo).SuperRegs;
- }
-
/// getName - Return the human-readable symbolic target-specific name for the
/// specified physical register.
const char *getName(unsigned RegNo) const {