re PR middle-end/10475 (ICE in subreg_highpart_offset for code with long long)

        PR middle-end/10475
        * expmed.c (emit_store_flag): Use simplify_gen_subreg directly
        for extracting sub-words.
	* gcc.c-torture/compile/20030612-1.c: New.

From-SVN: r67865

gcc/ChangeLog

 2003-06-12  Richard Henderson  <rth@redhat.com>
 
+        PR middle-end/10475
+        * expmed.c (emit_store_flag): Use simplify_gen_subreg directly
+        for extracting sub-words.
+
+2003-06-12  Richard Henderson  <rth@redhat.com>
+
         PR target/7594
         * config/m68k/m68k.md (zero_extendhisi2): Use gen_lowpart_SUBREG.
         (zero_extendqihi2, zero_extendqisi2): Likewise.

gcc/expmed.c

@@ -4354,19 +4354,27 @@ emit_store_flag (target, code, op0, op1, mode, unsignedp, normalizep)
     {
       if (code == EQ || code == NE)
 	{
+	  rtx op00, op01, op0both;
+
 	  /* Do a logical OR of the two words and compare the result.  */
-	  rtx op0h = gen_highpart (word_mode, op0);
-	  rtx op0l = gen_lowpart (word_mode, op0);
-	  rtx op0both = expand_binop (word_mode, ior_optab, op0h, op0l,
-				      NULL_RTX, unsignedp, OPTAB_DIRECT);
+	  op00 = simplify_gen_subreg (word_mode, op0, mode, 0);
+	  op01 = simplify_gen_subreg (word_mode, op0, mode, UNITS_PER_WORD);
+	  op0both = expand_binop (word_mode, ior_optab, op00, op01,
+				  NULL_RTX, unsignedp, OPTAB_DIRECT);
 	  if (op0both != 0)
 	    return emit_store_flag (target, code, op0both, op1, word_mode,
 				    unsignedp, normalizep);
 	}
       else if (code == LT || code == GE)
-	/* If testing the sign bit, can just test on high word.  */
-	return emit_store_flag (target, code, gen_highpart (word_mode, op0),
-				op1, word_mode, unsignedp, normalizep);
+	{
+	  rtx op0h;
+
+	  /* If testing the sign bit, can just test on high word.  */
+	  op0h = simplify_gen_subreg (word_mode, op0, mode,
+				      subreg_highpart_offset (word_mode, mode));
+	  return emit_store_flag (target, code, op0h, op1, word_mode,
+				  unsignedp, normalizep);
+	}
     }
 
   /* From now on, we won't change CODE, so set ICODE now.  */

gcc/testsuite/gcc.c-torture/compile/20030612-1.c

+static inline void
+foo (long long const v0, long long const v1)
+{
+  bar (v0 == v1);
+}
+
+void
+test (void)
+{
+  foo (0, 1);
+}