Re-commit r98683 ("remove redundant writeback flag from ARM address mode 6")

with changes to add a separate optional register update argument.  Change all
the NEON instructions with address register writeback to use it.

llvm-svn: 99095

1 files changed, 4 insertions, 16 deletions

diff --git a/llvm/lib/Target/ARM/ARMAddressingModes.h b/llvm/lib/Target/ARM/ARMAddressingModes.h
index 21b57752270..ea62c3330e6 100644
--- a/llvm/lib/Target/ARM/ARMAddressingModes.h
+++ b/llvm/lib/Target/ARM/ARMAddressingModes.h
@@ -524,23 +524,11 @@ namespace ARM_AM {
   //
   // This is used for NEON load / store instructions.
   //
-  // addrmode6 := reg with optional writeback and alignment
+  // addrmode6 := reg with optional alignment
   //
-  // This is stored in four operands [regaddr, regupdate, opc, align].  The
-  // first is the address register.  The second register holds the value of
-  // a post-access increment for writeback or reg0 if no writeback or if the
-  // writeback increment is the size of the memory access.  The third
-  // operand encodes whether there is writeback to the address register. The
-  // fourth operand is the value of the alignment specifier to use or zero if
-  // no explicit alignment.
-
-  static inline unsigned getAM6Opc(bool WB = false) {
-    return (int)WB;
-  }
-
-  static inline bool getAM6WBFlag(unsigned Mode) {
-    return Mode & 1;
-  }
+  // This is stored in two operands [regaddr, align].  The first is the
+  // address register.  The second operand is the value of the alignment
+  // specifier to use or zero if no explicit alignment.
 
 } // end namespace ARM_AM
 } // end namespace llvm