Really reserve R2 on PPC Darwin. PR 6314.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96399 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/PowerPC/PPCRegisterInfo.td b/lib/Target/PowerPC/PPCRegisterInfo.td
index 049e893e82edff36737cc25690bbf437ad2e6341..1cb7340c9c291e788b17e95580b6b40b5f1b73e7 100644 (file)
--- a/lib/Target/PowerPC/PPCRegisterInfo.td
+++ b/lib/Target/PowerPC/PPCRegisterInfo.td
@@ -287,10 +287,8 @@ def GPRC : RegisterClass<"PPC", [i32], 32,
     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 {
@@ -325,10 +323,8 @@ def G8RC : RegisterClass<"PPC", [i64], 64,
     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 {