From: Ulrich Weigand <uweigand@de.ibm.com>
Date: Mon, 6 Oct 2003 15:56:07 +0000 (+0000)
Subject: reload.c (find_reloads_subreg_address): Use correct offset for paradoxical MEM subreg... 
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=6357135a0e6e8d95d05b370f15e6daff39d7dfee;p=gcc.git

reload.c (find_reloads_subreg_address): Use correct offset for paradoxical MEM subregs on big-endian targets.

	* reload.c (find_reloads_subreg_address): Use correct offset for
	paradoxical MEM subregs on big-endian targets.

From-SVN: r72153
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index d36ae3aa8fa..b39d79c1b04 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2003-10-06  Ulrich Weigand  <uweigand@de.ibm.com>
+
+	* reload.c (find_reloads_subreg_address): Use correct offset for
+	paradoxical MEM subregs on big-endian targets.
+
 2003-10-06  Andrew Haley  <aph@redhat.com>
 
 	* tree.c (get_callee_fndecl): Call
diff --git a/gcc/reload.c b/gcc/reload.c
index dc088730e67..59852ba2b5e 100644
--- a/gcc/reload.c
+++ b/gcc/reload.c
@@ -5806,9 +5806,16 @@ find_reloads_subreg_address (rtx x, int force_replace, int opnum,
 	  if (force_replace
 	      || ! rtx_equal_p (tem, reg_equiv_mem[regno]))
 	    {
-	      int offset = SUBREG_BYTE (x);
 	      unsigned outer_size = GET_MODE_SIZE (GET_MODE (x));
 	      unsigned inner_size = GET_MODE_SIZE (GET_MODE (SUBREG_REG (x)));
+	      int offset;
+
+	      /* For big-endian paradoxical subregs, SUBREG_BYTE does not
+		 hold the correct (negative) byte offset.  */
+	      if (BYTES_BIG_ENDIAN && outer_size > inner_size)
+		offset = inner_size - outer_size;
+	      else
+		offset = SUBREG_BYTE (x);
 
 	      XEXP (tem, 0) = plus_constant (XEXP (tem, 0), offset);
 	      PUT_MODE (tem, GET_MODE (x));