From 9dd791c86c770caf0b6a12a0dfae7cf0e0469f89 Mon Sep 17 00:00:00 2001
From: Alexandre Oliva <aoliva@redhat.com>
Date: Thu, 21 Feb 2002 19:21:35 +0000
Subject: rtlanal.c (replace_rtx): Don't make a CONST_INT the operand of SUBREG
 or ZERO_EXTEND.

* rtlanal.c (replace_rtx): Don't make a CONST_INT the operand of
SUBREG or ZERO_EXTEND.

From-SVN: r49935
---
 gcc/rtlanal.c | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

(limited to 'gcc/rtlanal.c')

diff --git a/gcc/rtlanal.c b/gcc/rtlanal.c
index 37f1e64..5f338e8 100644
--- a/gcc/rtlanal.c
+++ b/gcc/rtlanal.c
@@ -2417,6 +2417,40 @@ replace_rtx (x, from, to)
   if (x == 0)
     return 0;
 
+  if (GET_CODE (x) == SUBREG)
+    {
+      rtx new = replace_rtx (SUBREG_REG (x), from, to);
+
+      if (GET_CODE (new) == CONST_INT)
+	{
+	  x = simplify_subreg (GET_MODE (x), new,
+			       GET_MODE (SUBREG_REG (x)),
+			       SUBREG_BYTE (x));
+	  if (! x)
+	    abort ();
+	}
+      else
+	SUBREG_REG (x) = new;
+
+      return x;
+    }
+  else if (GET_CODE (x) == ZERO_EXTEND)
+    {
+      rtx new = replace_rtx (XEXP (x, 0), from, to);
+
+      if (GET_CODE (new) == CONST_INT)
+	{
+	  x = simplify_unary_operation (ZERO_EXTEND, GET_MODE (x),
+					new, GET_MODE (XEXP (x, 0)));
+	  if (! x)
+	    abort ();
+	}
+      else
+	XEXP (x, 0) = new;
+
+      return x;
+    }
+
   fmt = GET_RTX_FORMAT (GET_CODE (x));
   for (i = GET_RTX_LENGTH (GET_CODE (x)) - 1; i >= 0; i--)
     {
-- 
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