(num_sign_bit_copies, case SUBREG): Properly compute the number of

sign bit copies of SUBREGs of promoted objects. From-SVN: r4341

(num_sign_bit_copies, case SUBREG): Properly compute the number of
sign bit copies of SUBREGs of promoted objects. From-SVN: r4341
dc3e17ad · Richard Kenner · 7877bbb3 · dc3e17ad
Commit dc3e17ad authored May 05, 1993 by Richard Kenner
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gcc/combine.c
+3 -3

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--- a/gcc/combine.c
+++ b/gcc/combine.c
 /* Optimize by combining instructions for GNU compiler.
-   Copyright (C) 1987, 1988, 1992 Free Software Foundation, Inc.
+   Copyright (C) 1987, 1988, 1992, 1993 Free Software Foundation, Inc.
 This file is part of GNU CC.
@@ -6519,8 +6519,8 @@ num_sign_bit_copies (x, mode)
 	 high-order bits are known to be sign bit copies.  */
      if (SUBREG_PROMOTED_VAR_P (x) && ! SUBREG_PROMOTED_UNSIGNED_P (x))
-	return (GET_MODE_BITSIZE (mode) - GET_MODE_BITSIZE (GET_MODE (x))
+	return MAX (bitwidth - GET_MODE_BITSIZE (GET_MODE (x)) + 1,
-		+ num_sign_bit_copies (SUBREG_REG (x), GET_MODE (x)));
+		    num_sign_bit_copies (SUBREG_REG (x), mode));
      /* For a smaller object, just ignore the high bits. */
      if (bitwidth <= GET_MODE_BITSIZE (GET_MODE (SUBREG_REG (x))))