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ifcvt.c (seq_contains_jump): Delete function.

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* ifcvt.c (seq_contains_jump): Delete function.
	(end_ifcvt_sequence): Replace call to seq_contains_jump with an
	inline test for a jump instruction in the existing "insn" loop.
	(block_fallthru): Document function.

From-SVN: r83697
This commit is contained in:
Roger Sayle 2004-06-26 01:43:57 +00:00 • committed by Roger Sayle
parent 0e60562abe
commit c520979797
2 changed files with 15 additions and 24 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2004-06-25 Roger Sayle <roger@eyesopen.com>
* ifcvt.c (seq_contains_jump): Delete function.
(end_ifcvt_sequence): Replace call to seq_contains_jump with an
inline test for a jump instruction in the existing "insn" loop.
(block_fallthru): Document function.
2004-06-25 Philip Blundell <philb@gnu.org> 2004-06-25 Philip Blundell <philb@gnu.org>
PR wrong-code/15089 PR wrong-code/15089

32
gcc/ifcvt.c
View file

@ -88,7 +88,6 @@ static bool life_data_ok;
static int count_bb_insns (basic_block); static int count_bb_insns (basic_block);
static rtx first_active_insn (basic_block); static rtx first_active_insn (basic_block);
static rtx last_active_insn (basic_block, int); static rtx last_active_insn (basic_block, int);
static int seq_contains_jump (rtx);
static basic_block block_fallthru (basic_block); static basic_block block_fallthru (basic_block);
static int cond_exec_process_insns (ce_if_block_t *, rtx, rtx, rtx, rtx, int); static int cond_exec_process_insns (ce_if_block_t *, rtx, rtx, rtx, rtx, int);
static rtx cond_exec_get_condition (rtx); static rtx cond_exec_get_condition (rtx);
@ -213,22 +212,7 @@ last_active_insn (basic_block bb, int skip_use_p)
return insn; return insn;
} }
/* It is possible, especially when having dealt with multi-word /* Return the basic block reached by falling though the basic block BB. */
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 (rtx insn)
{
while (insn)
{
if (GET_CODE (insn) == JUMP_INSN)
return 1;
insn = NEXT_INSN (insn);
}
return 0;
}
static basic_block static basic_block
block_fallthru (basic_block bb) block_fallthru (basic_block bb)
@ -707,7 +691,7 @@ noce_emit_move_insn (rtx x, rtx y)
static rtx static rtx
end_ifcvt_sequence (struct noce_if_info *if_info) end_ifcvt_sequence (struct noce_if_info *if_info)
{ {
rtx y; rtx insn;
rtx seq = get_insns (); rtx seq = get_insns ();
set_used_flags (if_info->x); set_used_flags (if_info->x);
@ -715,15 +699,15 @@ end_ifcvt_sequence (struct noce_if_info *if_info)
unshare_all_rtl_in_chain (seq); unshare_all_rtl_in_chain (seq);
end_sequence (); end_sequence ();
if (seq_contains_jump (seq)) /* Make sure that all of the instructions emitted are recognizable,
return NULL_RTX; and that we haven't introduced a new jump instruction.
/* Make sure that all of the instructions emitted are recognizable.
As an excersise for the reader, build a general mechanism that As an excersise for the reader, build a general mechanism that
allows proper placement of required clobbers. */ allows proper placement of required clobbers. */
for (y = seq; y ; y = NEXT_INSN (y)) for (insn = seq; insn; insn = NEXT_INSN (insn))
if (recog_memoized (y) == -1) if (GET_CODE (insn) == JUMP_INSN
|| recog_memoized (insn) == -1)
return NULL_RTX; return NULL_RTX;
return seq; return seq;
} }