* Enable allocation of registers r2-r10

* Allocate registers 13-31 backwards (to be able to store them all at once)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14896 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/PowerPC/PPCRegisterInfo.td b/lib/Target/PowerPC/PPCRegisterInfo.td
index d6e8175009d0f6b75d14993466d310575b481867..8324b9439d021508b88ac965baf80b317a909e4a 100644 (file)
--- a/lib/Target/PowerPC/PPCRegisterInfo.td
+++ b/lib/Target/PowerPC/PPCRegisterInfo.td
@@ -73,14 +73,17 @@ def TBL : SPR<4>;
 def TBU : SPR<5>;
 
 /// Register classes
+// Allocate volatiles first
+// then nonvolatiles in reverse order since stmw/lmw save from rN to r31
 def GPRC : 
   RegisterClass<i32, 4, 
-    [R11, R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R22, R23, R24, R25,
-     R26, R27, R28, R29, R30, R31, R0, R1, R2, R3, R4, R5, R6, R7, R8, R9, R10]>
+    [R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, 
+     R31, R30, R29, R28, R27, R26, R25, R24, R23, R22, R21, R20, R19, R18, R17,
+     R16, R15, R14, R13, R0, R1]>
 {
   let Methods = [{
     iterator allocation_order_end(MachineFunction &MF) const {
-      return end()-10;   // do not allocate r0-r10
+      return end()-2;
     }
   }];
 }
@@ -89,4 +92,4 @@ def FPRC : RegisterClass<f64, 8, [F0, F1, F2, F3, F4, F5, F6, F7,
   F8, F9, F10, F11, F12, F13, F14, F15, F16, F17, F18, F19, F20, F21,
   F22, F23, F24, F25, F26, F27, F28, F29, F30, F31]>;
 
-//def CRRC : RegisterClass<i4, 1, [CR0, CR1, CR2, CR3, CR4, CR5, CR6, CR7]>;
+//def CRRC : RegisterClass<i32, 4, [CR0, CR1, CR2, CR3, CR4, CR5, CR6, CR7]>;