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flow.c (init_propagate_block_info): Don't abort if a conditional jump is not a comparison of a register.

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* flow.c (init_propagate_block_info): Don't abort if a conditional
jump is not a comparison of a register.  Instead, just don't record
conditional life information.

From-SVN: r72594
This commit is contained in:
Richard Earnshaw 2003-10-17 10:30:43 +00:00 committed by Richard Earnshaw
parent b8fa9ea133
commit 38b2a60531
2 changed files with 48 additions and 37 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2003-10-17 Richard Earnshaw <rearnsha@arm.com>
* flow.c (init_propagate_block_info): Don't abort if a conditional
jump is not a comparison of a register. Instead, just don't record
conditional life information.
2003-10-16 Jan Hubicka <jh@suse.cz>
PR optimization/12630

79
gcc/flow.c
View File

@ -1861,16 +1861,15 @@ init_propagate_block_info (basic_block bb, regset live, regset local_set,
free_reg_cond_life_info);
pbi->reg_cond_reg = BITMAP_XMALLOC ();
/* If this block ends in a conditional branch, for each register live
from one side of the branch and not the other, record the register
as conditionally dead. */
/* If this block ends in a conditional branch, for each register
live from one side of the branch and not the other, record the
register as conditionally dead. */
if (GET_CODE (bb->end) == JUMP_INSN
&& any_condjump_p (bb->end))
{
regset_head diff_head;
regset diff = INITIALIZE_REG_SET (diff_head);
basic_block bb_true, bb_false;
rtx cond_true, cond_false, set_src;
int i;
/* Identify the successor blocks. */
@ -1898,53 +1897,59 @@ init_propagate_block_info (basic_block bb, regset live, regset local_set,
bb_false = bb_true;
}
/* Extract the condition from the branch. */
set_src = SET_SRC (pc_set (bb->end));
cond_true = XEXP (set_src, 0);
cond_false = gen_rtx_fmt_ee (reverse_condition (GET_CODE (cond_true)),
GET_MODE (cond_true), XEXP (cond_true, 0),
XEXP (cond_true, 1));
if (GET_CODE (XEXP (set_src, 1)) == PC)
{
rtx t = cond_false;
cond_false = cond_true;
cond_true = t;
}
/* Compute which register lead different lives in the successors. */
if (bitmap_operation (diff, bb_true->global_live_at_start,
bb_false->global_live_at_start, BITMAP_XOR))
{
/* Extract the condition from the branch. */
rtx set_src = SET_SRC (pc_set (bb->end));
rtx cond_true = XEXP (set_src, 0);
rtx reg = XEXP (cond_true, 0);
if (GET_CODE (reg) == SUBREG)
reg = SUBREG_REG (reg);
if (GET_CODE (reg) != REG)
abort ();
/* We can only track conditional lifetimes if the condition is
in the form of a comparison of a register against zero.
If the condition is more complex than that, then it is safe
not to record any information. */
if (GET_CODE (reg) == REG
&& XEXP (cond_true, 1) == const0_rtx)
{
rtx cond_false
= gen_rtx_fmt_ee (reverse_condition (GET_CODE (cond_true)),
GET_MODE (cond_true), XEXP (cond_true, 0),
XEXP (cond_true, 1));
if (GET_CODE (XEXP (set_src, 1)) == PC)
{
rtx t = cond_false;
cond_false = cond_true;
cond_true = t;
}
SET_REGNO_REG_SET (pbi->reg_cond_reg, REGNO (reg));
SET_REGNO_REG_SET (pbi->reg_cond_reg, REGNO (reg));
/* For each such register, mark it conditionally dead. */
EXECUTE_IF_SET_IN_REG_SET
(diff, 0, i,
{
struct reg_cond_life_info *rcli;
rtx cond;
/* For each such register, mark it conditionally dead. */
EXECUTE_IF_SET_IN_REG_SET
(diff, 0, i,
{
struct reg_cond_life_info *rcli;
rtx cond;
rcli = xmalloc (sizeof (*rcli));
rcli = xmalloc (sizeof (*rcli));
if (REGNO_REG_SET_P (bb_true->global_live_at_start, i))
cond = cond_false;
else
cond = cond_true;
rcli->condition = cond;
rcli->stores = const0_rtx;
rcli->orig_condition = cond;
if (REGNO_REG_SET_P (bb_true->global_live_at_start, i))
cond = cond_false;
else
cond = cond_true;
rcli->condition = cond;
rcli->stores = const0_rtx;
rcli->orig_condition = cond;
splay_tree_insert (pbi->reg_cond_dead, i,
(splay_tree_value) rcli);
});
splay_tree_insert (pbi->reg_cond_dead, i,
(splay_tree_value) rcli);
});
}
}
FREE_REG_SET (diff);