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ifcvt.c (seq_contains_jump): New.

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* ifcvt.c (seq_contains_jump): New.
        (noce_try_store_flag_constants): Use it to fail conversion.
        (noce_try_store_flag_inc, noce_try_store_flag_mask): Likewise.

From-SVN: r34179
This commit is contained in:
Richard Henderson 2000-05-25 16:53:23 -07:00 committed by Richard Henderson
parent 0519ce3019
commit 4e4017cbe5
2 changed files with 37 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2000-05-25 Richard Henderson <rth@cygnus.com>
* ifcvt.c (seq_contains_jump): New.
(noce_try_store_flag_constants): Use it to fail conversion.
(noce_try_store_flag_inc, noce_try_store_flag_mask): Likewise.
2000-05-25 Mark Mitchell <mark@codesourcery.com>
* except.h (can_throw): Declare it.

31
gcc/ifcvt.c
View File

@ -73,6 +73,7 @@ static sbitmap *post_dominators;
static int count_bb_insns PARAMS ((basic_block));
static rtx first_active_insn PARAMS ((basic_block));
static int last_active_insn_p PARAMS ((basic_block, rtx));
static int seq_contains_jump PARAMS ((rtx));
static int cond_exec_process_insns PARAMS ((rtx, rtx, rtx, rtx, int));
static rtx cond_exec_get_condition PARAMS ((rtx));
@ -173,6 +174,24 @@ last_active_insn_p (bb, insn)
return GET_CODE (insn) == JUMP_INSN;
}
/* It is possible, especially when having dealt with multi-word
arithmetic, for the expanders to have emitted jumps. Search
through the sequence and return TRUE if a jump exists so that
we can abort the conversion. */
static int
seq_contains_jump (insn)
rtx insn;
{
while (insn)
{
if (GET_CODE (insn) == JUMP_INSN)
return 1;
insn = NEXT_INSN (insn);
}
return 0;
}
/* Go through a bunch of insns, converting them to conditional
execution format if possible. Return TRUE if all of the non-note
@ -637,6 +656,10 @@ noce_try_store_flag_constants (if_info)
seq = get_insns ();
end_sequence ();
if (seq_contains_jump (seq))
return FALSE;
emit_insns_before (seq, if_info->cond_earliest);
return TRUE;
@ -691,6 +714,10 @@ noce_try_store_flag_inc (if_info)
seq = get_insns ();
end_sequence ();
if (seq_contains_jump (seq))
return FALSE;
emit_insns_before (seq, if_info->cond_earliest);
return TRUE;
@ -738,6 +765,10 @@ noce_try_store_flag_mask (if_info)
seq = get_insns ();
end_sequence ();
if (seq_contains_jump (seq))
return FALSE;
emit_insns_before (seq, if_info->cond_earliest);
return TRUE;