* cse.c (fold_rtx): Work around bug in Sun V5.0 compilers.

From-SVN: r28941

gcc/ChangeLog

 Fri Aug 27 15:35:24 1999  Jeffrey A Law  (law@cygnus.com)
 
+	* cse.c (fold_rtx): Work around bug in Sun V5.0 compilers.
+
 	* pa.c (emit_move_sequence): Do not stop on SUBREG_WORD of an
 	operand.
 

gcc/cse.c

@@ -5802,7 +5802,14 @@ fold_rtx (x, insn)
 	     hence not save anything) or be incorrect.  */
 	  if (const_arg1 != 0 && GET_CODE (const_arg1) == CONST_INT
 	      && INTVAL (const_arg1) < 0
-	      && - INTVAL (const_arg1) >= 0
+	      /* This used to test
+
+	         - INTVAL (const_arg1) >= 0
+
+		 But The Sun V5.0 compilers mis-compiled that test.  So
+		 instead we test for the problematic value in a more direct
+		 manner and hope the Sun compilers get it correct.  */
+	      && INTVAL (const_arg1) != (1 << (HOST_BITS_PER_WIDE_INT - 1))
 	      && GET_CODE (folded_arg1) == REG)
 	    {
 	      rtx new_const = GEN_INT (- INTVAL (const_arg1));