combine.c (distribute_notes): Don't bother REG_WAS_0.

	* combine.c (distribute_notes): Don't bother REG_WAS_0.
	* cse.c (cse_insn): Likewise.
	* final.c (final_scan_insn): Likewise.
	* jump.c (duplicate_loop_exit_test): Likewise.
	* rtl.c (reg_note_name): Remove REG_WAS_0.
	* rtl.h (REG_WAS_0): Remove.
	* unroll.c (final_reg_note_copy): Don't bother REG_WAS_0.
	* config/avr/avr.c (output_movqi): Don't use reg_was_0.
	(output_movhi): Likewise.
	(output_movsisf): Likewise.
	(reg_was_0): Remove.
	* config/m68hc11/m68hc11.c (m68hc11_gen_movhi): Don't use
	REG_WAS_0.
	(m68hc11_gen_movqi): Likewise.
	* config/vax/vax-protos.h: Remove the prototype for
	reg_was_0_p.
	* config/vax/vax.c (follows_p): Remove.
	(reg_was_0_p): Likewise.
	* config/vax/vax.md (movsi): Don't use reg_was_0_p.
	(movhi): Likewise.
	(movqi): Likewise.
	* doc/rtl.texi (REG_WAS_0): Remove.

From-SVN: r68753

3 files changed, 0 insertions, 46 deletions

diff --git a/gcc/config/vax/vax-protos.h b/gcc/config/vax/vax-protos.h
index 8da42d0d027..199db19af55 100644
--- a/gcc/config/vax/vax-protos.h
+++ b/gcc/config/vax/vax-protos.h
@@ -25,7 +25,6 @@ extern const char *rev_cond_name PARAMS ((rtx));
 extern void split_quadword_operands PARAMS ((rtx *, rtx *, int));
 extern void print_operand_address PARAMS ((FILE *, rtx));
 extern int vax_float_literal PARAMS ((rtx));
-extern int reg_was_0_p PARAMS ((rtx, rtx));
 #endif /* RTX_CODE */
 
 #ifdef REAL_VALUE_TYPE
diff --git a/gcc/config/vax/vax.c b/gcc/config/vax/vax.c
index fea970e0eda..1b94beef01d 100644
--- a/gcc/config/vax/vax.c
+++ b/gcc/config/vax/vax.c
@@ -41,7 +41,6 @@ Boston, MA 02111-1307, USA.  */
 #include "target.h"
 #include "target-def.h"
 
-static int follows_p PARAMS ((rtx, rtx));
 static void vax_output_function_prologue PARAMS ((FILE *, HOST_WIDE_INT));
 static void vax_file_start PARAMS ((void));
 static void vax_output_mi_thunk PARAMS ((FILE *, tree, HOST_WIDE_INT,
@@ -755,41 +754,6 @@ vax_rtx_costs (x, code, outer_code, total)
   return true;
 }
 
-/* Return 1 if insn A follows B.  */
-
-static int
-follows_p (a, b)
-     rtx a, b;
-{
-  register rtx p;
-
-  for (p = a; p != b; p = NEXT_INSN (p))
-    if (! p)
-      return 1;
-
-  return 0;
-}
-
-/* Returns 1 if we know operand OP was 0 before INSN.  */
-
-int
-reg_was_0_p (insn, op)
-     rtx insn, op;
-{
-  rtx link;
-
-  return ((link = find_reg_note (insn, REG_WAS_0, 0))
-	  /* Make sure the insn that stored the 0 is still present
-	     and doesn't follow INSN in the insn sequence.  */
-	  && ! INSN_DELETED_P (XEXP (link, 0))
-	  && GET_CODE (XEXP (link, 0)) != NOTE
-	  && ! follows_p (XEXP (link, 0), insn)
-	  /* Make sure cross jumping didn't happen here.  */
-	  && no_labels_between_p (XEXP (link, 0), insn)
-	  /* Make sure the reg hasn't been clobbered.  */
-	  && ! reg_set_between_p (op, XEXP (link, 0), insn));
-}
-
 /* Output code to add DELTA to the first argument, and then jump to FUNCTION.
    Used for C++ multiple inheritance.
 	.mask	^m<r2,r3,r4,r5,r6,r7,r8,r9,r10,r11>  #conservative entry mask
diff --git a/gcc/config/vax/vax.md b/gcc/config/vax/vax.md
index d0dc9556021..7027604ed9e 100644
--- a/gcc/config/vax/vax.md
+++ b/gcc/config/vax/vax.md
@@ -193,9 +193,6 @@
   ""
   "*
 {
-  if (operands[1] == const1_rtx && reg_was_0_p (insn, operands[0]))
-    return \"incl %0\";
-
   if (GET_CODE (operands[1]) == SYMBOL_REF || GET_CODE (operands[1]) == CONST)
     {
       if (push_operand (operands[0], SImode))
@@ -230,9 +227,6 @@
   ""
   "*
 {
-  if (operands[1] == const1_rtx && reg_was_0_p (insn, operands[0]))
-    return \"incw %0\";
-
   if (GET_CODE (operands[1]) == CONST_INT)
     {
       int i = INTVAL (operands[1]);
@@ -275,9 +269,6 @@
   ""
   "*
 {
-  if (operands[1] == const1_rtx && reg_was_0_p (insn, operands[0]))
-    return \"incb %0\";
-
   if (GET_CODE (operands[1]) == CONST_INT)
     {
       int i = INTVAL (operands[1]);