re PR rtl-optimization/9258 (ICE in compensate_edge, at reg-stack.c:2589)

	PR f/9258
	* global.c (struct allocno): Add no_stack_reg.
	(global_conflicts): Set no_stack_reg.
	(find_reg): Use it.

	* convert.c (convert_to_real): Fold - and abs only when profitable.
	* fold-const.c (fold): Fold truncates in - and abs.

	* gcc.c-torture/compile/20030115-1.c: New test.

	* gcc.dg/i386-fpcvt-1.c: New test.
	* gcc.dg/i386-fpcvt-2.c: New test.

From-SVN: r61329

gcc/ChangeLog

+Wed Jan 15 12:23:21 CET 2003  Jan Hubicka  <jh@suse.cz>
+
+	PR f/9258
+	* global.c (struct allocno): Add no_stack_reg. 
+	(global_conflicts): Set no_stack_reg.
+	(find_reg): Use it.
+
+	* convert.c (convert_to_real): Fold - and abs only when profitable.
+	* fold-const.c (fold): Fold truncates in - and abs.
+
 2003-01-15  Josef Zlomek  <zlomekj@suse.cz>
 
 	Segher Boessenkool  <segher@koffie.nl>

gcc/convert.c

@@ -229,9 +229,11 @@ convert_to_real (type, expr)
 	/* convert (float)-x into -(float)x.  This is always safe.  */
 	case ABS_EXPR:
 	case NEGATE_EXPR:
-	  return build1 (TREE_CODE (expr), type,
-			 fold (convert_to_real (type,
-						TREE_OPERAND (expr, 0))));
+	  if (TYPE_PRECISION (type) < TYPE_PRECISION (TREE_TYPE (expr)))
+	    return build1 (TREE_CODE (expr), type,
+			   fold (convert_to_real (type,
+						  TREE_OPERAND (expr, 0))));
+	  break;
 	/* convert (outertype)((innertype0)a+(innertype1)b)
 	   into ((newtype)a+(newtype)b) where newtype
 	   is the widest mode from all of these.  */

gcc/fold-const.c

@@ -5035,6 +5035,15 @@ fold (expr)
 	}
       else if (TREE_CODE (arg0) == NEGATE_EXPR)
 	return TREE_OPERAND (arg0, 0);
+      /* Convert -((double)float) into (double)(-float).  */
+      else if (TREE_CODE (arg0) == NOP_EXPR
+	       && TREE_CODE (type) == REAL_TYPE)
+	{
+	  tree targ0 = strip_float_extensions (arg0);
+	  if (targ0 != arg0)
+	    return convert (type, build1 (NEGATE_EXPR, TREE_TYPE (targ0), targ0));
+			   
+	}
 
       /* Convert - (a - b) to (b - a) for non-floating-point.  */
       else if (TREE_CODE (arg0) == MINUS_EXPR
@@ -5083,6 +5092,15 @@ fold (expr)
 	}
       else if (TREE_CODE (arg0) == ABS_EXPR || TREE_CODE (arg0) == NEGATE_EXPR)
 	return build1 (ABS_EXPR, type, TREE_OPERAND (arg0, 0));
+      /* Convert fabs((double)float) into (double)fabsf(float).  */
+      else if (TREE_CODE (arg0) == NOP_EXPR
+	       && TREE_CODE (type) == REAL_TYPE)
+	{
+	  tree targ0 = strip_float_extensions (arg0);
+	  if (targ0 != arg0)
+	    return convert (type, build1 (ABS_EXPR, TREE_TYPE (targ0), targ0));
+			   
+	}
       else
 	{
 	  /* fabs(sqrt(x)) = sqrt(x) and fabs(exp(x)) = exp(x).  */

gcc/global.c

@@ -132,6 +132,11 @@ struct allocno
   /* Set of hard registers that some later allocno has a preference for.  */
 
   HARD_REG_SET regs_someone_prefers;
+
+#ifdef STACK_REGS
+  /* Set to true if allocno can't be allocated in the stack register.  */
+  bool no_stack_reg;
+#endif
 };
 
 static struct allocno *allocno;
@@ -708,8 +713,14 @@ global_conflicts ()
 	    if (e->flags & EDGE_ABNORMAL)
 	      break;
 	  if (e != NULL)
-	    for (ax = FIRST_STACK_REG; ax <= LAST_STACK_REG; ax++)
-	      record_one_conflict (ax);
+	    {
+	      EXECUTE_IF_SET_IN_ALLOCNO_SET (allocnos_live, ax,
+		{
+		  allocno[ax].no_stack_reg = 1;
+		});
+	      for (ax = FIRST_STACK_REG; ax <= LAST_STACK_REG; ax++)
+		record_one_conflict (ax);
+	    }
 	}
 #endif
       }
@@ -1206,6 +1217,10 @@ find_reg (num, losers, alt_regs_p, accept_call_clobbered, retrying)
 	      && ! invalid_mode_change_p (regno, REGNO_REG_CLASS (regno),
 					  mode)
 #endif
+#ifdef STACK_REGS
+	     && (!allocno[num].no_stack_reg
+		 || regno < FIRST_STACK_REG || regno > LAST_STACK_REG)
+#endif
 	      )
 	    {
 	      /* We explicitly evaluate the divide results into temporary

gcc/testsuite/ChangeLog

+Wed Jan 15 12:20:52 CET 2003  Jan Hubicka  <jh@suse.cz>
+
+	* gcc.c-torture/compile/20030115-1.c: New test.
+
+	* gcc.dg/i386-fpcvt-1.c: New test.
+	* gcc.dg/i386-fpcvt-2.c: New test.
+
 2003-01-14  Jeffrey D. Oldham  <oldham@codesourcery.com>
 
 	Further conform g++'s __vmi_class_type_info to the C++ ABI

gcc/testsuite/g77.f-torture/compile/20030115-1.c

+      SUBROUTINE FOO (B)
+
+   10 CALL BAR(A)
+      ASSIGN 20 TO M
+      IF(100.LT.A) GOTO 10
+      GOTO 40
+C
+   20 IF(B.LT.ABS(A)) GOTO 10
+      ASSIGN 30 TO M
+      GOTO 40
+C
+   30 ASSIGN 10 TO M
+   40 GOTO M,(10,20,30)
+      END

gcc/testsuite/gcc.dg/i386-fpcvt-3.c

+/* { dg-do compile { target i?86-*-* x86_64-*-* } } */
+/* { dg-options "-O2 -msse2 -march=athlon" } */
+/* { dg-final { scan-assembler-not "cvtss2sd" } } */
+float a,b;
+main()
+{
+	a=fabs(b)+1.0;
+}