pa.c (output_move_double): Handle indirect stores to memory via an auto-incremented...

	* pa.c (output_move_double): Handle indirect stores to memory
	via an auto-incremented/auto-decremented register in the same
	manner in which loads are handled.

From-SVN: r2751

diff --git a/gcc/config/pa/pa.c b/gcc/config/pa/pa.c
index b1a8d8dd4b0cdca6909514a4681a1f9f2a80567b..8b32e194429c21980885e83a4955ae9c38d26b09 100644 (file)
--- a/gcc/config/pa/pa.c
+++ b/gcc/config/pa/pa.c
@@ -798,16 +798,49 @@ output_move_double (operands)
 
   if (optype0 == MEMOP)
     {
+      /* We have to output the address syntax ourselves, since print_operand
+        doesn't deal with the addresses we want to use.  Fix this later.  */
+
       rtx addr = XEXP (operands[0], 0);
-      if (GET_CODE (addr) == POST_INC || GET_CODE (addr) == PRE_INC)
+      if (GET_CODE (addr) == POST_INC || GET_CODE (addr) == POST_DEC)
        {
-         operands[0] = gen_rtx (MEM, SImode, addr);
-         return "stw%M0 %1,%0\n\tstw%M0 %R1,%0";
+         rtx high_reg = gen_rtx (SUBREG, SImode, operands[1], 0);
+
+         operands[0] = XEXP (addr, 0);
+         if (GET_CODE (operands[1]) != REG || GET_CODE (operands[0]) != REG)
+           abort ();
+
+         if (!reg_overlap_mentioned_p (high_reg, addr))
+           {
+             /* No overlap between high target register and address
+                register.  (We do this in a non-obvious way to
+                save a register file writeback)  */
+             if (GET_CODE (addr) == POST_INC)
+               return "stws,ma %1,8(0,%0)\n\tstw %R1,-4(0,%0)";
+             return "stws,ma %1,-8(0,%0)\n\tstw %R1,12(0,%0)";
+           }
+         else
+           abort();
        }
-      else if (GET_CODE (addr) == POST_DEC || GET_CODE (addr) == PRE_DEC)
+      else if (GET_CODE (addr) == PRE_INC || GET_CODE (addr) == PRE_DEC)
        {
-         operands[0] = gen_rtx (MEM, SImode, addr);
-         return "stw%M0 %R1,%0\n\tstw%M0 %1,%0";
+         rtx high_reg = gen_rtx (SUBREG, SImode, operands[1], 0);
+
+         operands[0] = XEXP (addr, 0);
+         if (GET_CODE (operands[1]) != REG || GET_CODE (operands[0]) != REG)
+           abort ();
+
+         if (!reg_overlap_mentioned_p (high_reg, addr))
+           {
+             /* No overlap between high target register and address
+                register.  (We do this in a non-obvious way to
+                save a register file writeback)  */
+             if (GET_CODE (addr) == PRE_INC)
+               return "stws,mb %1,8(0,%0)\n\tstw %R1,4(0,%0)";
+             return "stws,mb %1,-8(0,%0)\n\tstw %R1,4(0,%0)";
+           }
+         else
+           abort();
        }
     }
   if (optype1 == MEMOP)