(simplify_binary_operation): Insure that folded >> extends

the sign even if the host bootstrap compiler doesn't. From-SVN: r2446

(simplify_binary_operation): Insure that folded >> extends
the sign even if the host bootstrap compiler doesn't. From-SVN: r2446
2166571b · Richard Stallman · 9f61f8ad · 2166571b
Commit 2166571b authored Oct 14, 1992 by Richard Stallman
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gcc/cse.c
+6 -0

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--- a/gcc/cse.c
+++ b/gcc/cse.c
@@ -3964,6 +3964,12 @@ simplify_binary_operation (code, mode, op0, op1)
 	return 0;

      val = arg0s >> arg1;
+
+      /* Bootstrap compiler may not have sign extended the right shift.
+	 Manually extend the sign to insure bootstrap cc matches gcc.  */
+      if (arg0s < 0 && arg1 > 0)
+	val |= ((HOST_WIDE_INT) -1) << (HOST_BITS_PER_WIDE_INT - arg1);
+
      break;

    case ROTATERT: