// VRsave register
def VRSAVE: SPR<256, "VRsave">, DwarfRegNum<[107]>;
+// Carry bit. In the architecture this is really bit 0 of the XER register
+// (which really is SPR register 1); this is the only bit interesting to a
+// compiler.
+def CARRY: SPR<1, "ca">, DwarfRegNum<[0]>;
+
// FP rounding mode: bits 30 and 31 of the FP status and control register
// This is not allocated as a normal register; it appears only in
// Uses and Defs. The ABI says it needs to be preserved by a function,
GPRCClass::allocation_order_begin(const MachineFunction &MF) const {
// 32-bit SVR4 ABI: r2 is reserved for the OS.
// 64-bit SVR4 ABI: r2 is reserved for the TOC pointer.
- if (!MF.getTarget().getSubtarget<PPCSubtarget>().isDarwin())
- return begin()+1;
-
- return begin();
+ // Darwin: R2 is reserved for CR save/restore sequence.
+ return begin()+1;
}
GPRCClass::iterator
GPRCClass::allocation_order_end(const MachineFunction &MF) const {
G8RCClass::iterator
G8RCClass::allocation_order_begin(const MachineFunction &MF) const {
// 64-bit SVR4 ABI: r2 is reserved for the TOC pointer.
- if (!MF.getTarget().getSubtarget<PPCSubtarget>().isDarwin())
- return begin()+1;
-
- return begin();
+ // Darwin: r2 is reserved for CR save/restore sequence.
+ return begin()+1;
}
G8RCClass::iterator
G8RCClass::allocation_order_end(const MachineFunction &MF) const {
def CTRRC : RegisterClass<"PPC", [i32], 32, [CTR]>;
def CTRRC8 : RegisterClass<"PPC", [i64], 64, [CTR8]>;
def VRSAVERC : RegisterClass<"PPC", [i32], 32, [VRSAVE]>;
+def CARRYRC : RegisterClass<"PPC", [i32], 32, [CARRY]> {
+ let CopyCost = -1;
+}