sysv4.h (MASK_NO_BITFIELD_WORD): New macro.

	* config/rs6000/sysv4.h (MASK_NO_BITFIELD_WORD): New macro.
	(TARGET_NO_BITFIELD_WORD): New macro.
	(SUBTARGET_SWITCHES): Add -mbit-word, -mno-bit-word options.
	(BITFIELD_NBYTES_LIMITED): Define based on TARGET_NO_BITFIELD_WORD.

From-SVN: r39613

gcc/ChangeLog

+2001-02-12  Geoffrey Keating  <geoffk@redhat.com>
+
+	* config/rs6000/sysv4.h (MASK_NO_BITFIELD_WORD): New macro.
+	(TARGET_NO_BITFIELD_WORD): New macro.
+	(SUBTARGET_SWITCHES): Add -mbit-word, -mno-bit-word options.
+	(BITFIELD_NBYTES_LIMITED): Define based on TARGET_NO_BITFIELD_WORD.
+
 Mon Feb 12 18:13:26 2001  Richard Kenner  <kenner@vlsi1.ultra.nyu.edu>
 
 	* cselib.c: New file, from simplify-rtx.c.

gcc/config/rs6000/sysv4.h

@@ -57,6 +57,7 @@ extern enum rs6000_sdata_type rs6000_sdata;
 #define	MASK_REGNAMES		0x02000000	/* Use alternate register names.  */
 #define	MASK_PROTOTYPE		0x01000000	/* Only prototyped fcns pass variable args.  */
 #define MASK_LONG_DOUBLE_128	0x00800000	/* Use IEEE quad long double.  */
+#define MASK_NO_BITFIELD_WORD	0x00400000	/* Bitfields cannot cross word boundaries */
 
 #define	TARGET_NO_BITFIELD_TYPE	(target_flags & MASK_NO_BITFIELD_TYPE)
 #define	TARGET_STRICT_ALIGN	(target_flags & MASK_STRICT_ALIGN)
@@ -66,6 +67,7 @@ extern enum rs6000_sdata_type rs6000_sdata;
 #define	TARGET_REGNAMES		(target_flags & MASK_REGNAMES)
 #define	TARGET_PROTOTYPE	(target_flags & MASK_PROTOTYPE)
 #define TARGET_LONG_DOUBLE_128	(target_flags & MASK_LONG_DOUBLE_128)
+#define TARGET_NO_BITFIELD_WORD	(target_flags & MASK_NO_BITFIELD_WORD)
 #define	TARGET_TOC		((target_flags & MASK_64BIT)		\
 				 || ((target_flags & (MASK_RELOCATABLE	\
 						      | MASK_MINIMAL_TOC)) \
@@ -136,6 +138,9 @@ extern int g_switch_set;		/* Whether -G xx was passed.  */
   { "no-traceback",	 0, N_("no description yet") },			\
   { "eabi",		 MASK_EABI, N_("Use EABI.") },			\
   { "no-eabi",		-MASK_EABI, N_("Don't use EABI.") },		\
+  { "bit-word",		-MASK_NO_BITFIELD_WORD, "" },			\
+  { "no-bit-word",	 MASK_NO_BITFIELD_WORD,				\
+    N_("Do not allow bitfields to cross word boundaries") },		\
   { "regnames",		  MASK_REGNAMES,				\
     N_("Use alternate register names.") },				\
   { "no-regnames",	 -MASK_REGNAMES,				\
@@ -380,6 +385,9 @@ do {									\
 #undef	PCC_BITFIELD_TYPE_MATTERS
 #define	PCC_BITFIELD_TYPE_MATTERS (TARGET_BITFIELD_TYPE)
 
+#undef	BITFIELD_NBYTES_LIMITED
+#define	BITFIELD_NBYTES_LIMITED (TARGET_NO_BITFIELD_WORD)
+
 /* Define this macro to be the value 1 if instructions will fail to
    work if given data not on the nominal alignment.  If instructions
    will merely go slower in that case, define this macro as 0.  */