/* Combine stack adjustments.
Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997,
- 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
+ 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
-Software Foundation; either version 2, or (at your option) any later
+Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
for more details.
You should have received a copy of the GNU General Public License
-along with GCC; see the file COPYING. If not, write to the Free
-Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
-02110-1301, USA. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
/* Track stack adjustments and stack memory references. Attempt to
reduce the number of stack adjustments by back-propagating across
for (i = 1; i < XVECLEN (tmp, 0); ++i)
{
- rtx this = XVECEXP (tmp, 0, i);
+ rtx this_rtx = XVECEXP (tmp, 0, i);
/* The special case is allowing a no-op set. */
- if (GET_CODE (this) == SET
- && SET_SRC (this) == SET_DEST (this))
+ if (GET_CODE (this_rtx) == SET
+ && SET_SRC (this_rtx) == SET_DEST (this_rtx))
;
- else if (GET_CODE (this) != CLOBBER
- && GET_CODE (this) != USE)
+ else if (GET_CODE (this_rtx) != CLOBBER
+ && GET_CODE (this_rtx) != USE)
return NULL_RTX;
}
return 0;
}
+/* Adjust or create REG_FRAME_RELATED_EXPR note when merging a stack
+ adjustment into a frame related insn. */
+
+static void
+adjust_frame_related_expr (rtx last_sp_set, rtx insn,
+ HOST_WIDE_INT this_adjust)
+{
+ rtx note = find_reg_note (last_sp_set, REG_FRAME_RELATED_EXPR, NULL_RTX);
+ rtx new_expr = NULL_RTX;
+
+ if (note == NULL_RTX && RTX_FRAME_RELATED_P (insn))
+ return;
+
+ if (note
+ && GET_CODE (XEXP (note, 0)) == SEQUENCE
+ && XVECLEN (XEXP (note, 0), 0) >= 2)
+ {
+ rtx expr = XEXP (note, 0);
+ rtx last = XVECEXP (expr, 0, XVECLEN (expr, 0) - 1);
+ int i;
+
+ if (GET_CODE (last) == SET
+ && RTX_FRAME_RELATED_P (last) == RTX_FRAME_RELATED_P (insn)
+ && SET_DEST (last) == stack_pointer_rtx
+ && GET_CODE (SET_SRC (last)) == PLUS
+ && XEXP (SET_SRC (last), 0) == stack_pointer_rtx
+ && GET_CODE (XEXP (SET_SRC (last), 1)) == CONST_INT)
+ {
+ XEXP (SET_SRC (last), 1)
+ = GEN_INT (INTVAL (XEXP (SET_SRC (last), 1)) + this_adjust);
+ return;
+ }
+
+ new_expr = gen_rtx_SEQUENCE (VOIDmode,
+ rtvec_alloc (XVECLEN (expr, 0) + 1));
+ for (i = 0; i < XVECLEN (expr, 0); i++)
+ XVECEXP (new_expr, 0, i) = XVECEXP (expr, 0, i);
+ }
+ else
+ {
+ new_expr = gen_rtx_SEQUENCE (VOIDmode, rtvec_alloc (2));
+ if (note)
+ XVECEXP (new_expr, 0, 0) = XEXP (note, 0);
+ else
+ {
+ rtx expr = copy_rtx (single_set_for_csa (last_sp_set));
+
+ XEXP (SET_SRC (expr), 1)
+ = GEN_INT (INTVAL (XEXP (SET_SRC (expr), 1)) - this_adjust);
+ RTX_FRAME_RELATED_P (expr) = 1;
+ XVECEXP (new_expr, 0, 0) = expr;
+ }
+ }
+
+ XVECEXP (new_expr, 0, XVECLEN (new_expr, 0) - 1)
+ = copy_rtx (single_set_for_csa (insn));
+ RTX_FRAME_RELATED_P (XVECEXP (new_expr, 0, XVECLEN (new_expr, 0) - 1))
+ = RTX_FRAME_RELATED_P (insn);
+ if (note)
+ XEXP (note, 0) = new_expr;
+ else
+ REG_NOTES (last_sp_set)
+ = gen_rtx_EXPR_LIST (REG_FRAME_RELATED_EXPR, new_expr,
+ REG_NOTES (last_sp_set));
+}
+
/* Subroutine of combine_stack_adjustments, called for each basic block. */
static void
last_sp_adjust + this_adjust,
this_adjust))
{
+ if (RTX_FRAME_RELATED_P (last_sp_set))
+ adjust_frame_related_expr (last_sp_set, insn,
+ this_adjust);
/* It worked! */
delete_insn (insn);
last_sp_adjust += this_adjust;
deallocation+allocation conspired to cancel, we can
delete the old deallocation insn. */
if (last_sp_set && last_sp_adjust == 0)
- delete_insn (insn);
+ delete_insn (last_sp_set);
free_csa_memlist (memlist);
memlist = NULL;
last_sp_set = insn;
return 0;
}
-struct tree_opt_pass pass_stack_adjustments =
+struct rtl_opt_pass pass_stack_adjustments =
{
+ {
+ RTL_PASS,
"csa", /* name */
gate_handle_stack_adjustments, /* gate */
rest_of_handle_stack_adjustments, /* execute */
0, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
- TODO_df_finish |
+ TODO_df_finish | TODO_verify_rtl_sharing |
TODO_dump_func |
TODO_ggc_collect, /* todo_flags_finish */
- 0 /* letter */
+ }
};
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