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Get correct bit offset for big endian (SUBREG (REG))
author
Michael Meissner
<meissner@gcc.gnu.org>
Mon, 3 Apr 1995 20:19:05 +0000
(20:19 +0000)
committer
Michael Meissner
<meissner@gcc.gnu.org>
Mon, 3 Apr 1995 20:19:05 +0000
(20:19 +0000)
From-SVN: r9299
gcc/expmed.c
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diff --git
a/gcc/expmed.c
b/gcc/expmed.c
index f725f7ab18bf81aed9d73026fc2bf247dba6b343..fc0a0ef70468663c8020c0a58007b0ae3586f873 100644
(file)
--- 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);
}