Teach if-converter to be more careful with predicating instructions that would

take multiple cycles to decode.
For the current if-converter clients (actually only ARM), the instructions that
are predicated on false are not nops. They would still take machine cycles to
decode. Micro-coded instructions such as LDM / STM can potentially take multiple
cycles to decode. If-converter should take treat them as non-micro-coded
simple instructions.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@113570 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 10 insertions, 0 deletions

diff --git a/lib/Target/ARM/ARMSubtarget.h b/lib/Target/ARM/ARMSubtarget.h
index 67e58038ee..34f571fd70 100644
--- a/lib/Target/ARM/ARMSubtarget.h
+++ b/lib/Target/ARM/ARMSubtarget.h
@@ -29,6 +29,10 @@ protected:
     V4, V4T, V5T, V5TE, V6, V6M, V6T2, V7A, V7M
   };
 
+  enum ARMProcFamilyEnum {
+    Others, CortexA8, CortexA9
+  };
+
   enum ARMFPEnum {
     None, VFPv2, VFPv3, NEON
   };
@@ -42,6 +46,9 @@ protected:
   /// V6, V6T2, V7A, V7M.
   ARMArchEnum ARMArchVersion;
 
+  /// ARMProcFamily - ARM processor family: Cortex-A8, Cortex-A9, and others.
+  ARMProcFamilyEnum ARMProcFamily;
+
   /// ARMFPUType - Floating Point Unit type.
   ARMFPEnum ARMFPUType;
 
@@ -143,6 +150,9 @@ protected:
   bool hasV6T2Ops() const { return ARMArchVersion >= V6T2; }
   bool hasV7Ops()   const { return ARMArchVersion >= V7A;  }
 
+  bool isCortexA8() const { return ARMProcFamily == CortexA8; }
+  bool isCortexA9() const { return ARMProcFamily == CortexA9; }
+
   bool hasARMOps() const { return !NoARM; }
 
   bool hasVFP2() const { return ARMFPUType >= VFPv2; }