* cse.c (CHEAP_REGNO): Redefine using REGNO_PTR_FRAME_P and

	HARD_REGISTER_NUM_P.

	* cselib.c (new_cselib_val): Make comment correct and more detailed.
	* flow.c (mark_set_1): Likewise.

	* except.c (duplicate_eh_region_1, duplicate_eh_region_2,
	duplicate_eh_regions): Remove.
	* except.h (duplicate_eh_regions): Remove prototype.
	* integrate.c (get_label_from_map, copy_rtx_and_substitute,
	global_const_equiv_varray): Remove.
	* integrate.h (get_label_from_map, copy_rtx_and_substitute,
	global_const_equiv_varray, set_label_in_map): Remove prototypes,
	extern declaration, and #define.
	(MAYBE_EXTEND_CONST_EQUIV_VARRAY, SET_CONST_EQUIV_DATA): Remove.
	(struct inline_remap): Remove.
	* varray.c (struct element): Remove entry for const_equiv_data.
	* varray.h (struct const_equiv_data): Remove.
	(enum varray_data_enum) <VARRAY_DATA_CONST_EQUIV>: Remove.
	(union varray_data_tag) <const_equiv>: Remove.
	(VARRAY_CONST_EQUIV_INIT, VARRAY_CONST_EQUIV,
	VARRAY_PUSH_CONST_EQUIV, VARRAY_TOP_CONST_EQUIV): Remove.

	* regstack.c (record_label_references): Remove unused function.

	* rtl.def (VALUE): Update comment.
	(LABEL_REF): Remove unused operand 2.
	* rtl.h (struct rtx_def): Update for removed accessor macros.
	(XCADVFLAGS, INSN_DEAD_CODE_P, LINE_NUMBER, CONTAINING_INSN,
	REG_LOOP_TEST_P): Remove.
	(ADDR_DIFF_VEC_FLAGS, CSELIB_VAL_PTR, LABEL_NEXTREF): Add comments.
	* web.c (entry_register): Don't copy REG_LOOP_TEST_P.
	* doc/rtl.texi (INSN_DEAD_CODE_P, REG_LOOP_TEST_P): Remove.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@90580 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 5 insertions, 2 deletions

diff --git a/gcc/cselib.c b/gcc/cselib.c
index eb0b52a2edc..df22800114d 100644
--- a/gcc/cselib.c
+++ b/gcc/cselib.c
@@ -704,8 +704,11 @@ new_cselib_val (unsigned int value, enum machine_mode mode)
   gcc_assert (value);
 
   e->value = value;
-  /* We use custom method to allocate this RTL construct because it accounts
-     about 8% of overall memory usage.  */
+  /* We use an alloc pool to allocate this RTL construct because it
+     accounts for about 8% of the overall memory usage.  We know
+     precisely when we can have VALUE RTXen (when cselib is active)
+     so we don't need to put them in garbave collected memory.
+     ??? Why should a VALUE be an RTX in the first place?  */
   e->u.val_rtx = pool_alloc (value_pool);
   memset (e->u.val_rtx, 0, RTX_HDR_SIZE);
   PUT_CODE (e->u.val_rtx, VALUE);