(extract_bit_field): Check TRULY_NOOP_TRUNCATION before

making a SUBREG of a REG. From-SVN: r12338

(extract_bit_field): Check TRULY_NOOP_TRUNCATION before
making a SUBREG of a REG. From-SVN: r12338
f8fe20b2 · Jim Wilson · 7e99e494 · f8fe20b2
Commit f8fe20b2 authored 28 years ago by Jim Wilson
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gcc/expmed.c
+3 -1

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--- a/gcc/expmed.c
+++ b/gcc/expmed.c
@@ -928,7 +928,9 @@ extract_bit_field (str_rtx, bitsize, bitnum, unsignedp,
     So too extracting a subword value in
     the least significant part of the register.  */

-  if ((GET_CODE (op0) == REG
+  if (((GET_CODE (op0) == REG
+	&& TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (mode),
+				  GET_MODE_BITSIZE (GET_MODE (op0))))
       || (GET_CODE (op0) == MEM
 	   && (! SLOW_UNALIGNED_ACCESS
 	       || (offset * BITS_PER_UNIT % bitsize == 0