From ee5332b81a9cd1dea4c73f596648ae70533f5fe5 Mon Sep 17 00:00:00 2001
From: Richard Henderson <rth@cygnus.com>
Date: Wed, 20 Jan 1999 18:21:28 -0800
Subject: cse.c (fold_rtx): Revert 29 Dec change.

        * cse.c (fold_rtx): Revert 29 Dec change.
        (cse_insn): Revert 12 Jan change.
        * expr.c (expand_builtin): Don't emit CONST around CONSTANT_P_RTX.
        * regclass.c (reg_scan_mark_refs): Revert 29 Dec change.
        * rtl.def: Likewise.
        * rtl.h (CONSTANT_P): Likewise.
        * expr.c (emit_move_insn): Never try to flush CONSTANT_P_RTX
        to memory.
        * recog.c (immediate_operand): Accept CONSTANT_P_RTX.
        * alpha.c (input_operand): Likewise.
        * c4x.c (const_operand): Likewise.
        * explow.c (allocate_dynamic_stack_space): Use register_operand
        instead of arith_operand, which does not exist.
        * 1750a.h: Fix comment closure.
        * a29k.c (a29k_set_memflags): Fix typo in 19 Jan change.
        * arc.md (one_cmplsi2_set_cc_insn): Fix set mode mismatch.
        * arm.h (TARGET_SWITCHES): Fix typo.
        * i370.md (anon mult and div patterns): Fix set mode mismatch.
        * i860.c (output_delayed_branch): Fix operands to constrain_operands.
        (output_delay_insn): Likewise.
        * m88k.md (anon rotate insns): Fix set mode mismatch.
        (anon BLKmode moves): Commonize and fix set mode mismatches.
        * ns32k.md (udivmoddi[shq]i4_internal): Fix mode mismatch.
        * romp.md (movdf): Fix typo.

From-SVN: r24796
---
 gcc/cse.c | 27 ++++++---------------------
 1 file changed, 6 insertions(+), 21 deletions(-)

(limited to 'gcc/cse.c')

diff --git a/gcc/cse.c b/gcc/cse.c
index 761ebff..572d24f 100644
--- a/gcc/cse.c
+++ b/gcc/cse.c
@@ -4931,21 +4931,6 @@ fold_rtx (x, insn)
   switch (code)
     {
     case CONST:
-      /* If the operand is a CONSTANT_P_RTX, see if what's inside it
-	 is known to be constant and replace the whole thing with a
-	 CONST_INT of either zero or one.  Note that this code assumes
-	 that an insn that recognizes a CONST will also recognize a
-	 CONST_INT, but that seems to be a safe assumption.  */
-      if (GET_CODE (XEXP (x, 0)) == CONSTANT_P_RTX)
-	{
-	  x = equiv_constant (fold_rtx (XEXP (XEXP (x, 0), 0), 0));
-	  return (x != 0 && (GET_CODE (x) == CONST_INT
-			     || GET_CODE (x) == CONST_DOUBLE)
-		  ? const1_rtx : const0_rtx);
-	}
-
-      /* ... fall through ... */
-
     case CONST_INT:
     case CONST_DOUBLE:
     case SYMBOL_REF:
@@ -5865,6 +5850,12 @@ fold_rtx (x, insn)
 					const_arg1 ? const_arg1 : folded_arg1,
 					const_arg2 ? const_arg2 : XEXP (x, 2));
       break;
+
+    case 'x':
+      /* Always eliminate CONSTANT_P_RTX at this stage. */
+      if (code == CONSTANT_P_RTX)
+	return (const_arg0 ? const1_rtx : const0_rtx);
+      break;
     }
 
   return new ? new : x;
@@ -6864,12 +6855,6 @@ cse_insn (insn, libcall_insn)
       if (src == src_folded)
         src_folded = 0;
 
-      /* Folds of constant_p_rtx are to be preferred, since we do
-	 not wish any to live past CSE.  */
-      if (src && GET_CODE (src) == CONST
-	  && GET_CODE (XEXP (src, 0)) == CONSTANT_P_RTX)
-	src = 0;
-
       /* At this point, ELT, if non-zero, points to a class of expressions
          equivalent to the source of this SET and SRC, SRC_EQV, SRC_FOLDED,
 	 and SRC_RELATED, if non-zero, each contain additional equivalent
-- 
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