re PR middle-end/41268 (bootstrap is broken after r151350 (expand from tuples))

	PR middle-end/41268
	* cfgexpand.c (expand_gimple_stmt_1): Use an int for storing
	SUBREG_PROMOTED_UNSIGNED_P, instead of a bool.
	* rtl.h (struct rtx, SUBREG_PROMOTED_UNSIGNED_P): Update comments
	to reflect reality.

From-SVN: r151544

gcc/ChangeLog

+2009-09-09  Michael Matz  <matz@suse.de>
+
+	PR middle-end/41268
+	* cfgexpand.c (expand_gimple_stmt_1): Use an int for storing
+	SUBREG_PROMOTED_UNSIGNED_P, instead of a bool.
+	* rtl.h (struct rtx, SUBREG_PROMOTED_UNSIGNED_P): Update comments
+	to reflect reality.
+
 2009-09-08  DJ Delorie  <dj@redhat.com>
 
 	* config/mep/mep.c (conversions[]): Add "ml" pattern.

gcc/cfgexpand.c

@@ -1920,19 +1920,19 @@ expand_gimple_stmt_1 (gimple stmt)
 	      ;
 	    else if (promoted)
 	      {
-		bool unsigndp = SUBREG_PROMOTED_UNSIGNED_P (target);
+		int unsignedp = SUBREG_PROMOTED_UNSIGNED_P (target);
 		/* If TEMP is a VOIDmode constant, use convert_modes to make
 		   sure that we properly convert it.  */
 		if (CONSTANT_P (temp) && GET_MODE (temp) == VOIDmode)
 		  {
 		    temp = convert_modes (GET_MODE (target),
 					  TYPE_MODE (ops.type),
-					  temp, unsigndp);
+					  temp, unsignedp);
 		    temp = convert_modes (GET_MODE (SUBREG_REG (target)),
-					  GET_MODE (target), temp, unsigndp);
+					  GET_MODE (target), temp, unsignedp);
 		  }
 
-		convert_move (SUBREG_REG (target), temp, unsigndp);
+		convert_move (SUBREG_REG (target), temp, unsignedp);
 	      }
 	    else if (nontemporal && emit_storent_insn (target, temp))
 	      ;

gcc/rtl.h

@@ -255,8 +255,7 @@ struct GTY((chain_next ("RTX_NEXT (&%h)"),
        ECF_LOOPING_CONST_OR_PURE and DECL_LOOPING_CONST_OR_PURE_P. */
   unsigned int call : 1;
   /* 1 in a REG, MEM, or CONCAT if the value is set at most once, anywhere.
-     1 in a SUBREG if it references an unsigned object whose mode has been
-     from a promoted to a wider mode.
+     1 in a SUBREG used for SUBREG_PROMOTED_UNSIGNED_P.
      1 in a SYMBOL_REF if it addresses something in the per-function
      constants pool.
      1 in a CALL_INSN logically equivalent to ECF_CONST and TREE_READONLY. 
@@ -268,7 +267,7 @@ struct GTY((chain_next ("RTX_NEXT (&%h)"),
      if it has been deleted.
      1 in a REG expression if corresponds to a variable declared by the user,
      0 for an internally generated temporary.
-     1 in a SUBREG with a negative value.
+     1 in a SUBREG used for SUBREG_PROMOTED_UNSIGNED_P.
      1 in a LABEL_REF, REG_LABEL_TARGET or REG_LABEL_OPERAND note for a
      non-local label.
      In a SYMBOL_REF, this flag is used for machine-specific purposes.
@@ -1161,6 +1160,15 @@ do {									\
     _rtx->unchanging = (VAL);						\
   }									\
 } while (0)
+
+/* Valid for subregs which are SUBREG_PROMOTED_VAR_P().  In that case
+   this gives the necessary extensions:
+   0  - signed
+   1  - normal unsigned
+   -1 - pointer unsigned, which most often can be handled like unsigned
+        extension, except for generating instructions where we need to
+	emit special code (ptr_extend insns) on some architectures.  */
+
 #define SUBREG_PROMOTED_UNSIGNED_P(RTX)	\
   ((RTL_FLAG_CHECK1("SUBREG_PROMOTED_UNSIGNED_P", (RTX), SUBREG)->volatil) \
    ? -1 : (int) (RTX)->unchanging)