hooks.h (hook_bool_const_int_const_int_true): Declare.

	* hooks.h (hook_bool_const_int_const_int_true): Declare.
	* hooks.c (hook_bool_const_int_const_int_true): New function.
	* target.h (struct gcc_target): Add can_eliminate field.
	* target-def.h (TARGET_CAN_ELIMINATE): Define.
	(TARGET_INITIALIZER): Use TARGET_CAN_ELIMINATE.
	* ira.c (setup_eliminable_regset): Use can_eliminate target hook.
	* reload1.c (update_eliminables, init_elim_table): (Ditto.).
	(elim_table): Revise comment.
	* system.h (CAN_ELIMINATE): Poison.
	* defaults.h (CAN_ELIMINATE): Remove.
	* doc/tm.texi (CAN_ELIMINATE): Revise documentation.

	* config/alpha/vms.h (CAN_ELIMINATE): Remove macro.
	* config/alpha/alpha.c (TARGET_CAN_ELIMINATE) [TARGET_ABI_OPEN_VMS]:
	Define macro.
	(alpha_vms_can_eliminate): Declare as static, change return type to
	bool.
	* config/alpha/alpha-protos.h (alpha_vms_can_eliminate): Remove.

	* config/arm/arm.h (CAN_ELIMINATE): Remove macro.
	* config/arm/arm.c (TARGET_CAN_ELIMINATE): Define macro.
	(arm_can_eliminate): New function.

	* config/avr/avr.h (CAN_ELIMINATE): Remove macro.
	* config/avr/avr.c (TARGET_CAN_ELIMINATE): Define macro.
	(avr_can_eliminate): Declare as static.
	* config/avr/avr-protos.h (avr_can_eliminate): Remove.

	* config/bfin/bfin.h (CAN_ELIMINATE): Remove macro.
	* config/bfin/bfin.c (TARGET_CAN_ELIMINATE): Define macro.
	(bfin_can_eliminate): New function.

	* config/crx/crx.h (CAN_ELIMINATE): Remove macro.
	* config/crx/crx.c (TARGET_CAN_ELIMINATE): Define macro.
	(crx_can_eliminate): New function.
	
	* config/fr30/fr30.h (CAN_ELIMINATE): Remove macro.
	* config/fr30/fr30.c (TARGET_CAN_ELIMINATE): Define macro.
	(fr30_can_eliminate): New function.

	* config/frv/frv.h (CAN_ELIMINATE): Remove macro.
	* config/frv/frv.c (TARGET_CAN_ELIMINATE): Define macro.
	(frv_can_eliminate): New function.

	* config/h8300/h8300.h (CAN_ELIMINATE): Remove macro.
	* config/h8300/h8300.c (TARGET_CAN_ELIMINATE): Define macro.
	(h8300_can_eliminate): New function.

	* config/i386/i386.h (CAN_ELIMINATE): Remove macro.
	* config/i386/i386.c (TARGET_CAN_ELIMINATE): Define macro.
	(i386_can_eliminate): Declare as static, change return type to bool.
	* config/i386/i386-protos.h (i386_can_eliminate): Remove.

	* config/ia64/ia64.h (CAN_ELIMINATE): Remove macro.
	* config/ia64/ia64.c (TARGET_CAN_ELIMINATE): Define macro.
	(ia64_can_eliminate): New function.

	* config/iq2000/iq2000.h (CAN_ELIMINATE): Remove macro.
	* config/iq2000/iq2000.c (TARGET_CAN_ELIMINATE): Define macro.
	(iq2000_can_eliminate): New function.

	* config/m32r/m32r.h (CAN_ELIMINATE): Remove macro.
	* config/m32r/m32r.c (TARGET_CAN_ELIMINATE): Define macro.
	(m32r_can_eliminate): New function.

	* config/m68hc11/m68hc11.h (CAN_ELIMINATE): Remove macro.
	* config/m68hc11/m68hc11.c (TARGET_CAN_ELIMINATE): Define macro.
	(m68hc11_can_eliminate): New function.

	* config/m68k/m68k.h (CAN_ELIMINATE): Remove macro.
	* config/m68k/m68k.c (TARGET_CAN_ELIMINATE): Define macro.
	(m68k_can_eliminate): New function.

	* config/mep/mep.h (CAN_ELIMINATE): Remove macro.
	* config/mep/mep.c (TARGET_CAN_ELIMINATE): Define macro.
	(mep_can_eliminate): New function.

	* config/mips/mips.h (CAN_ELIMINATE): Remove macro.
	* config/mips/mips.c (TARGET_CAN_ELIMINATE): Define macro.
	(mips_can_eliminate): New function.

	* config/rs6000/rs6000.h (CAN_ELIMINATE): Remove macro.
	* config/rs6000/rs6000.c (TARGET_CAN_ELIMINATE): Define macro.
	(rs6000_can_eliminate): New function.

	* config/s390/s390.h (CAN_ELIMINATE): Remove macro.
	* config/s390/s390.c (TARGET_CAN_ELIMINATE): Define macro.
	(s390_can_eliminate): Declare as static.
	* config/s390/s390-protos.h (sparc_can_eliminate): Remove.

	* config/score/score.h (CAN_ELIMINATE): Remove macro.
	* config/score/score.c (TARGET_CAN_ELIMINATE): Define macro.
	(score_can_eliminate): New function.

	* config/sparc/sparc.h (CAN_ELIMINATE): Remove macro.
	* config/sparc/sparc.c (TARGET_CAN_ELIMINATE): Define macro.
	(sparc_can_eliminate): Declare as static.
	* config/sparc/sparc-protos.h (sparc_can_eliminate): Remove.

	* config/stormy16/stormy16.h (CAN_ELIMINATE): Remove macro.
	* config/stormy16/stormy16.c (TARGET_CAN_ELIMINATE): Define macro.
	(xstormy16_can_eliminate): New function.

	* config/v850/v850.h (CAN_ELIMINATE): Remove macro.
	* config/v850/v850.c (TARGET_CAN_ELIMINATE): Define macro.
	(v850_can_eliminate): New function.

From-SVN: r151096

1 files changed, 22 insertions, 0 deletions

diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c
index 1ac6510..1cc9557 100644
--- a/gcc/config/arm/arm.c
+++ b/gcc/config/arm/arm.c
@@ -218,6 +218,7 @@ static tree arm_promoted_type (const_tree t);
 static tree arm_convert_to_type (tree type, tree expr);
 static bool arm_scalar_mode_supported_p (enum machine_mode);
 static bool arm_frame_pointer_required (void);
+static bool arm_can_eliminate (const int, const int);
 
 
 /* Table of machine attributes.  */
@@ -485,6 +486,9 @@ static const struct attribute_spec arm_attribute_table[] =
 #undef TARGET_FRAME_POINTER_REQUIRED
 #define TARGET_FRAME_POINTER_REQUIRED arm_frame_pointer_required
 
+#undef TARGET_CAN_ELIMINATE
+#define TARGET_CAN_ELIMINATE arm_can_eliminate
+
 struct gcc_target targetm = TARGET_INITIALIZER;
 
 /* Obstack for minipool constant handling.  */
@@ -14065,6 +14069,24 @@ arm_compute_initial_elimination_offset (unsigned int from, unsigned int to)
     }
 }
 
+/* Given FROM and TO register numbers, say whether this elimination is
+   allowed.  Frame pointer elimination is automatically handled.
+
+   All eliminations are permissible.  Note that ARG_POINTER_REGNUM and
+   HARD_FRAME_POINTER_REGNUM are in fact the same thing.  If we need a frame
+   pointer, we must eliminate FRAME_POINTER_REGNUM into
+   HARD_FRAME_POINTER_REGNUM and not into STACK_POINTER_REGNUM or
+   ARG_POINTER_REGNUM.  */
+
+bool
+arm_can_eliminate (const int from, const int to)
+{
+  return ((to == FRAME_POINTER_REGNUM && from == ARG_POINTER_REGNUM) ? false :
+          (to == STACK_POINTER_REGNUM && frame_pointer_needed) ? false :
+          (to == ARM_HARD_FRAME_POINTER_REGNUM && TARGET_THUMB) ? false :
+          (to == THUMB_HARD_FRAME_POINTER_REGNUM && TARGET_ARM) ? false :
+           true);
+}
 
 /* Emit RTL to save coprocessor registers on function entry.  Returns the
    number of bytes pushed.  */