arm.md (nop): Backout Apr 27 change.

        * arm.md (nop): Backout Apr 27 change. Ensure REGISTER_PREFIX is
        applied to each register.
        * aof.h (ASM_FILE_START): Define register `r0'.

From-SVN: r26914

gcc/ChangeLog

+Thu May 13 01:31:19 1999  Nick Burrett  <nick.burrett@btinternet.com>
+
+	* arm.md (nop): Backout Apr 27 change. Ensure REGISTER_PREFIX is
+	applied to each register.
+	* aof.h (ASM_FILE_START): Define register `r0'.
+
 1999-05-12 20:22 -0400  Zack Weinberg  <zack@rabi.columbia.edu>
 
 	* configure.in: Make --enable-cpp and --with-cpp-install-dir

gcc/config/arm/aof.h

@@ -177,6 +177,7 @@ do {					\
   extern char *version_string;					\
   fprintf ((STREAM), "%s Generated by gcc %s for ARM/%s\n", 	\
 	   ASM_COMMENT_START, version_string, ARM_OS_NAME);	\
+  fprintf ((STREAM), "__r0\tRN\t0\n");				\
   fprintf ((STREAM), "__a1\tRN\t0\n");				\
   fprintf ((STREAM), "__a2\tRN\t1\n");				\
   fprintf ((STREAM), "__a3\tRN\t2\n");				\

gcc/config/arm/arm.md

@@ -4426,15 +4426,7 @@
 (define_insn "nop"
   [(const_int 0)]
   ""
-  "*
-{
-  rtx operands[1];
-
-  operands[0] = gen_rtx (REG, SImode, 0);
-  output_asm_insn (\"mov%?\\t%0, %0\\t%@ nop\", operands);
-  return \"\";
-}
-")
+  "mov%?\\t%|r0, %|r0\\t%@ nop")
 
 ;; Patterns to allow combination of arithmetic, cond code and shifts