(simplify_shift_const):

For a subreg, require subreg_lowpart_p and not paradoxical. From-SVN: r2664

(simplify_shift_const):
For a subreg, require subreg_lowpart_p and not paradoxical. From-SVN: r2664
f9e67232 · Richard Stallman · 62c13b81 · f9e67232
Commit f9e67232 authored Oct 31, 1992 by Richard Stallman
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gcc/combine.c
+3 -1

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--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -6792,7 +6792,9 @@ simplify_shift_const (x, code, result_mode, varop, count)
 	  /* If VAROP is a SUBREG, strip it as long as the inner operand has
 	     the same number of words as what we've seen so far.  Then store
 	     the widest mode in MODE.  */
-	  if (SUBREG_WORD (varop) == 0
+	  if (subreg_lowpart_p (varop)
+	      && (GET_MODE_SIZE (GET_MODE (SUBREG_REG (varop)))
+		  > GET_MODE_SIZE (GET_MODE (varop)))
 	      && (((GET_MODE_SIZE (GET_MODE (SUBREG_REG (varop)))
 		    + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD)
 		  == mode_words))