2014-06-20 Tom de Vries <tom@codesourcery.com>
* target.def (call_fusage_contains_non_callee_clobbers): Update
definition.
* doc/tm.texi: Regenerate.
@@ -4884,14 +4884,14 @@ Whether this target supports splitting the stack when the options described in @
@cindex miscellaneous register hooks
@deftypevr {Target Hook} bool TARGET_CALL_FUSAGE_CONTAINS_NON_CALLEE_CLOBBERS
-set to true if all the calls in the current function contain clobbers in
-CALL_INSN_FUNCTION_USAGE for the registers that are clobbered by the call
-rather than by the callee, and are not already set or clobbered in the call
-pattern. Examples of such registers are registers used in PLTs and stubs,
-and temporary registers used in the call instruction but not present in the
-rtl pattern. Another way to formulate it is the registers not present in the
-rtl pattern that are clobbered by the call assuming the callee does not
-clobber any register. The default version of this hook is set to false.
+Set to true if each call that binds to a local definition explicitly
+clobbers or sets all non-fixed registers modified by performing the call.
+That is, by the call pattern itself, or by code that might be inserted by the
+linker (e.g. stubs, veneers, branch islands), but not including those
+modifiable by the callee. The affected registers may be mentioned explicitly
+in the call pattern, or included as clobbers in CALL_INSN_FUNCTION_USAGE.
+The default version of this hook is set to false. The purpose of this hook
+is to enable the fuse-caller-save optimization.
@end deftypevr
@node Varargs
@@ -5128,18 +5128,18 @@ FRAME_POINTER_REGNUM, ARG_POINTER_REGNUM, and the PIC_OFFSET_TABLE_REGNUM.",
hook_void_bitmap)
/* Targets should define this target hook to mark that non-callee clobbers are
- present in CALL_INSN_FUNCTION_USAGE for all the calls in the current
- function. */
+ present in CALL_INSN_FUNCTION_USAGE for all the calls that bind to a local
+ definition. */
DEFHOOKPOD
(call_fusage_contains_non_callee_clobbers,
- "set to true if all the calls in the current function contain clobbers in\n\
-CALL_INSN_FUNCTION_USAGE for the registers that are clobbered by the call\n\
-rather than by the callee, and are not already set or clobbered in the call\n\
-pattern. Examples of such registers are registers used in PLTs and stubs,\n\
-and temporary registers used in the call instruction but not present in the\n\
-rtl pattern. Another way to formulate it is the registers not present in the\n\
-rtl pattern that are clobbered by the call assuming the callee does not\n\
-clobber any register. The default version of this hook is set to false.",
+ "Set to true if each call that binds to a local definition explicitly\n\
+clobbers or sets all non-fixed registers modified by performing the call.\n\
+That is, by the call pattern itself, or by code that might be inserted by the\n\
+linker (e.g. stubs, veneers, branch islands), but not including those\n\
+modifiable by the callee. The affected registers may be mentioned explicitly\n\
+in the call pattern, or included as clobbers in CALL_INSN_FUNCTION_USAGE.\n\
+The default version of this hook is set to false. The purpose of this hook\n\
+is to enable the fuse-caller-save optimization.",
bool,
false)
--
1.9.1