From: Michael Meissner <meissner@gcc.gnu.org>
Date: Mon, 3 Apr 1995 20:19:05 +0000 (+0000)
Subject: Get correct bit offset for big endian (SUBREG (REG))
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=641916126ab82884b20fe98e24e20c0a8f099de7;p=gcc.git

Get correct bit offset for big endian (SUBREG (REG))

From-SVN: r9299
---

diff --git a/gcc/expmed.c b/gcc/expmed.c
index f725f7ab18b..fc0a0ef7046 100644
--- a/gcc/expmed.c
+++ b/gcc/expmed.c
@@ -878,7 +878,21 @@ extract_bit_field (str_rtx, bitsize, bitnum, unsignedp,
     tmode = mode;
   while (GET_CODE (op0) == SUBREG)
     {
+      int outer_size = GET_MODE_BITSIZE (GET_MODE (op0));
+      int inner_size = GET_MODE_BITSIZE (GET_MODE (SUBREG_REG (op0)));
+
       offset += SUBREG_WORD (op0);
+
+      if (BYTES_BIG_ENDIAN && (outer_size < inner_size))
+	{
+	  bitpos += inner_size - outer_size;
+	  if (bitpos > unit)
+	    {
+	      offset += (bitpos / unit);
+	      bitpos %= unit;
+	    }
+	}
+
       op0 = SUBREG_REG (op0);
     }