- Restore some i8 functionality in CellSPU

- New test case: nand.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45130 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 34 insertions, 0 deletions

diff --git a/lib/Target/CellSPU/SPURegisterInfo.td b/lib/Target/CellSPU/SPURegisterInfo.td
index 5379225..de64439 100644
--- a/lib/Target/CellSPU/SPURegisterInfo.td
+++ b/lib/Target/CellSPU/SPURegisterInfo.td
@@ -359,6 +359,40 @@ def R16C : RegisterClass<"SPU", [i16], 128,
   }];
 }
 
+// The SPU's registers as 8-bit wide (byte) "preferred slot":
+def R8C : RegisterClass<"SPU", [i8], 128,
+ [
+   /* volatile register */
+   R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, R16, 
+   R17, R18, R19, R20, R21, R22, R23, R24, R25, R26, R27, R28, R29, R30, R31,
+   R32, R33, R34, R35, R36, R37, R38, R39, R40, R41, R42, R43, R44, R45, R46,
+   R47, R48, R49, R50, R51, R52, R53, R54, R55, R56, R57, R58, R59, R60, R61,
+   R62, R63, R64, R65, R66, R67, R68, R69, R70, R71, R72, R73, R74, R75, R76,
+   R77, R78, R79,
+   /* non-volatile register: take hint from PPC and allocate in reverse order */
+   R127, R126, R125, R124, R123, R122, R121, R120, R119, R118, R117, R116, R115,
+   R114, R113, R112, R111, R110, R109, R108, R107, R106, R105, R104, R103, R102,
+   R101, R100, R99, R98, R97, R96, R95, R94, R93, R92, R91, R90, R89, R88, R87,
+   R86, R85, R84, R83, R82, R81, R80, 
+   /* environment ptr, SP, LR */ 
+   R2, R1, R0 ]>
+{
+  let MethodProtos = [{
+    iterator allocation_order_begin(const MachineFunction &MF) const;
+    iterator allocation_order_end(const MachineFunction &MF) const;
+  }];
+  let MethodBodies = [{
+    R8CClass::iterator
+    R8CClass::allocation_order_begin(const MachineFunction &MF) const {
+      return begin();
+    }
+    R8CClass::iterator
+    R8CClass::allocation_order_end(const MachineFunction &MF) const {
+      return end()-3;  // don't allocate R2, R1, or R0 (envp, sp, lr)
+    }
+  }];
+}
+
 // The SPU's registers as vector registers:
 def VECREG : RegisterClass<"SPU", [v16i8,v8i16,v4i32,v4f32,v2i64,v2f64], 128,
  [