Remove custom allocation order boilerplate that is no longer needed.

The register allocators automatically filter out reserved registers and
place the callee saved registers last in the allocation order, so custom
methods are no longer necessary just for that.

Some targets still use custom allocation orders:

ARM/Thumb: The high registers are removed from GPR in thumb mode. The
NEON allocation orders prefer to use non-VFP2 registers first.

X86: The GR8 classes omit AH-DH in x86-64 mode to avoid REX trouble.

SystemZ: Some of the allocation orders are omitting R12 aliases without
explanation. I don't understand this target well enough to fix that. It
looks like all the boilerplate could be removed by reserving the right
registers.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132781 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 3 insertions, 15 deletions

diff --git a/lib/Target/Sparc/SparcRegisterInfo.cpp b/lib/Target/Sparc/SparcRegisterInfo.cpp
index fdd66dd..9fcf028 100644
--- a/lib/Target/Sparc/SparcRegisterInfo.cpp
+++ b/lib/Target/Sparc/SparcRegisterInfo.cpp
@@ -39,6 +39,8 @@ const unsigned* SparcRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF)
 
 BitVector SparcRegisterInfo::getReservedRegs(const MachineFunction &MF) const {
   BitVector Reserved(getNumRegs());
+  // FIXME: G1 reserved for now for large imm generation by frame code.
+  Reserved.set(SP::G1);
   Reserved.set(SP::G2);
   Reserved.set(SP::G3);
   Reserved.set(SP::G4);
diff --git a/lib/Target/Sparc/SparcRegisterInfo.td b/lib/Target/Sparc/SparcRegisterInfo.td
index c1ef2e7..0729818 100644
--- a/lib/Target/Sparc/SparcRegisterInfo.td
+++ b/lib/Target/Sparc/SparcRegisterInfo.td
@@ -142,8 +142,6 @@ def D15 : Rd<30, "F30", [F30, F31]>, DwarfRegNum<[87]>;
 def IntRegs : RegisterClass<"SP", [i32], 32, [L0, L1, L2, L3, L4, L5, L6, L7,
                                      I0, I1, I2, I3, I4, I5,
                                      O0, O1, O2, O3, O4, O5, O7,
-
-   // FIXME: G1 reserved for now for large imm generation by frame code.
                                      G1,
                                      // Non-allocatable regs:
                                      G2, G3, G4, // FIXME: OK for use only in
@@ -153,19 +151,7 @@ def IntRegs : RegisterClass<"SP", [i32], 32, [L0, L1, L2, L3, L4, L5, L6, L7,
                                      I7, // return address
                                      G0, // constant zero
                                      G5, G6, G7 // reserved for kernel
-                                     ]> {
-  let MethodProtos = [{
-    iterator allocation_order_end(const MachineFunction &MF) const;
-  }];
-  let MethodBodies = [{
-    IntRegsClass::iterator
-    IntRegsClass::allocation_order_end(const MachineFunction &MF) const {
-      // FIXME: These special regs should be taken out of the regclass!
-      return end()-10  // Don't allocate special registers
-         -1;  // FIXME: G1 reserved for large imm generation by frame code.
-    }
-  }];
-}
+                                     ]>;
 
 def FPRegs : RegisterClass<"SP", [f32], 32, [F0, F1, F2, F3, F4, F5, F6, F7, F8,
   F9, F10, F11, F12, F13, F14, F15, F16, F17, F18, F19, F20, F21, F22,