[Patch] Fix for MIPS PR target/65604

[Steve Ellcey]

This is a MIPS patch to make mips_output_division obey the
-fno-delayed-branch flag.  Right now, with mips1 and -mcheck-zero-division,
the division instruction is put into the bne delay slot even when
-fno-delayed-branch is specified.  This change uses a similar strategy
to MIPS16 where we do the division first and then do the zero test
while the division is being calculated.  Tested with mips1 runs and by
inspecting the code that is output.

OK to checkin?

Steve Ellcey
sell...@imgtec.com


2015-12-09  Steve Ellcey  <sell...@imgtec.com>

        PR target/65604
        * config/mips/mips.c (mips_output_division): Check flag_delayed_branch.


diff --git a/gcc/config/mips/mips.c b/gcc/config/mips/mips.c
index 6145944..8444a91 100644
--- a/gcc/config/mips/mips.c
+++ b/gcc/config/mips/mips.c
@@ -13687,9 +13687,17 @@ mips_output_division (const char *division, rtx 
*operands)
        }
       else
        {
-         output_asm_insn ("%(bne\t%2,%.,1f", operands);
-         output_asm_insn (s, operands);
-         s = "break\t7%)\n1:";
+         if (flag_delayed_branch)
+           {
+             output_asm_insn ("%(bne\t%2,%.,1f", operands);
+             output_asm_insn (s, operands);
+             s = "break\t7%)\n1:";
+           }
+         else
+           {
+             output_asm_insn (s, operands);
+             s = "bne\t%2,%.,1f\n\tnop\n\tbreak\t7\n1:";
+           }
        }
     }
   return s;