/* Save and restore call-clobbered registers which are live across a call.
Copyright (C) 1989, 1992, 1994, 1995, 1997, 1998, 1999, 2000,
- 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
+ 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
Free Software Foundation, Inc.
This file is part of GCC.
void
save_call_clobbered_regs (void)
{
- struct insn_chain *chain, *next;
+ struct insn_chain *chain, *next, *last = NULL;
enum machine_mode save_mode [FIRST_PSEUDO_REGISTER];
/* Computed in mark_set_regs, holds all registers set by the current
if (TEST_HARD_REG_BIT (hard_regs_saved, regno))
n_regs_saved++;
}
+ last = chain;
}
else if (DEBUG_INSN_P (insn) && n_regs_saved)
mark_referenced_regs (&PATTERN (insn),
remain saved. If the last insn in the block is a JUMP_INSN, put
the restore before the insn, otherwise, put it after the insn. */
+ if (DEBUG_INSN_P (insn) && last && last->block == chain->block)
+ {
+ rtx ins, prev;
+ basic_block bb = BLOCK_FOR_INSN (insn);
+
+ /* When adding hard reg restores after a DEBUG_INSN, move
+ all notes between last real insn and this DEBUG_INSN after
+ the DEBUG_INSN, otherwise we could get code
+ -g/-g0 differences. */
+ for (ins = PREV_INSN (insn); ins != last->insn; ins = prev)
+ {
+ prev = PREV_INSN (ins);
+ if (NOTE_P (ins))
+ {
+ NEXT_INSN (prev) = NEXT_INSN (ins);
+ PREV_INSN (NEXT_INSN (ins)) = prev;
+ PREV_INSN (ins) = insn;
+ NEXT_INSN (ins) = NEXT_INSN (insn);
+ NEXT_INSN (insn) = ins;
+ if (NEXT_INSN (ins))
+ PREV_INSN (NEXT_INSN (ins)) = ins;
+ if (BB_END (bb) == insn)
+ BB_END (bb) = ins;
+ }
+ else
+ gcc_assert (DEBUG_INSN_P (ins));
+ }
+ }
+ last = NULL;
+
if (n_regs_saved)
for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
if (TEST_HARD_REG_BIT (hard_regs_saved, regno))