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[pf3gnuchains/gcc-fork.git] / gcc / machmode.h

diff --git a/gcc/machmode.h b/gcc/machmode.h
index 3ab7a81..4a3f6f5 100644 (file)
--- a/gcc/machmode.h
+++ b/gcc/machmode.h
@@ -1,6 +1,6 @@
 /* Machine mode definitions for GCC; included by rtl.h and tree.h.
    Copyright (C) 1991, 1993, 1994, 1996, 1998, 1999, 2000, 2001, 2003,
-   2007, 2008, 2009 Free Software Foundation, Inc.
+   2007, 2008, 2009, 2010 Free Software Foundation, Inc.
 
 This file is part of GCC.
 
@@ -221,6 +221,8 @@ extern const unsigned char mode_nunits[NUM_MACHINE_MODES];
 extern const unsigned char mode_wider[NUM_MACHINE_MODES];
 #define GET_MODE_WIDER_MODE(MODE) ((enum machine_mode) mode_wider[MODE])
 
+/* For scalars, this is a mode with twice the precision.  For vectors,
+   this is a mode with the same inner mode but with twice the elements.  */
 extern const unsigned char mode_2xwider[NUM_MACHINE_MODES];
 #define GET_MODE_2XWIDER_MODE(MODE) ((enum machine_mode) mode_2xwider[MODE])
 
@@ -248,7 +250,10 @@ extern enum machine_mode mode_for_vector (enum machine_mode, unsigned);
 
 /* Find the best mode to use to access a bit field.  */
 
-extern enum machine_mode get_best_mode (int, int, unsigned int,
+extern enum machine_mode get_best_mode (int, int,
+                                       unsigned HOST_WIDE_INT,
+                                       unsigned HOST_WIDE_INT,
+                                       unsigned int,
                                        enum machine_mode, int);
 
 /* Determine alignment, 1<=result<=BIGGEST_ALIGNMENT.  */
@@ -275,4 +280,12 @@ extern enum machine_mode ptr_mode;
 /* Target-dependent machine mode initialization - in insn-modes.c.  */
 extern void init_adjust_machine_modes (void);
 
+#define TRULY_NOOP_TRUNCATION_MODES_P(MODE1, MODE2) \
+  TRULY_NOOP_TRUNCATION (GET_MODE_PRECISION (MODE1), \
+                        GET_MODE_PRECISION (MODE2))
+
+#define HWI_COMPUTABLE_MODE_P(MODE) \
+  (SCALAR_INT_MODE_P (MODE) \
+   && GET_MODE_PRECISION (MODE) <= HOST_BITS_PER_WIDE_INT)
+
 #endif /* not HAVE_MACHINE_MODES */