Do not allow insns to be scheduled before prologue insns if profiling.

From-SVN: r2766

gcc/config/mips/mips.c

@@ -4207,6 +4207,12 @@ mips_expand_prologue ()
       if (frame_pointer_needed)
 	emit_insn (gen_movsi (frame_pointer_rtx, stack_pointer_rtx));
     }
+
+  /* If we are profiling, make sure no instructions are scheduled before
+     the call to mcount.  */
+
+  if (profile_flag || profile_block_flag)
+    emit_insn (gen_blockage ());
 }
 
 

gcc/config/mips/mips.h

@@ -482,7 +482,7 @@ while (0)
 
 /* Print subsidiary information on the compiler version in use.  */
 
-#define MIPS_VERSION "[AL 1.1, MM 28]"
+#define MIPS_VERSION "[AL 1.1, MM 29]"
 
 #ifndef MACHINE_TYPE
 #define MACHINE_TYPE "BSD Mips"
@@ -1929,6 +1929,12 @@ typedef struct mips_args {
   fprintf (FILE, "\t.set\tat\n");					\
 }
 
+/* Define this macro if the code for function profiling should come
+   before the function prologue.  Normally, the profiling code comes
+   after.  */
+
+/* #define PROFILE_BEFORE_PROLOGUE */
+
 /* EXIT_IGNORE_STACK should be nonzero if, when returning from a function,
    the stack pointer does not matter.  The value is tested only in
    functions that have frame pointers.

gcc/config/mips/mips.md

@@ -4003,6 +4003,18 @@ move\\t%0,%z4\\n\\
     }
 }")
 
+;; Block any insns from being moved before this point, since the
+;; profiling call to mcount can use various registers that aren't
+;; saved or used to pass arguments.
+
+(define_insn "blockage"
+  [(unspec_volatile [(const_int 0)] 0)]
+  ""
+  ""
+  [(set_attr "type"	"unknown")
+   (set_attr "mode"	"none")
+   (set_attr "length"	"0")])
+
 ;; At present, don't expand the epilogue, reorg.c will clobber the
 ;; return register in compiling gen_lowpart (emit-rtl.c).
 ;;