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sibcall.c (skip_unreturned_value): New function.

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* sibcall.c (skip_unreturned_value): New function.
	(call_ends_block_p): Use it.

From-SVN: r43010
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Jan Hubicka 2001-06-08 14:24:30 +02:00 committed by Jan Hubicka
parent d58d4c12b0
commit cf7ec0ab00
2 changed files with 38 additions and 0 deletions
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3
gcc/ChangeLog
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@ -1,5 +1,8 @@
Fri Jun 8 14:16:33 CEST 2001 Jan Hubicka <jh@suse.cz>
* sibcall.c (skip_unreturned_value): New function.
(call_ends_block_p): Use it.
* recog.c (split_insn): Break out from ...
(split_all_insns): ... here; do not use basic block information
when it is broken.

35
gcc/sibcall.c
View File

@ -43,6 +43,7 @@ static int uses_addressof PARAMS ((rtx));
static int sequence_uses_addressof PARAMS ((rtx));
static void purge_reg_equiv_notes PARAMS ((void));
static void purge_mem_unchanging_flag PARAMS ((rtx));
static rtx skip_unreturned_value PARAMS ((rtx));
/* Examine a CALL_PLACEHOLDER pattern and determine where the call's
return value is located. P_HARD_RETURN receives the hard register
@ -220,6 +221,35 @@ skip_use_of_return_value (orig_insn, code)
return orig_insn;
}
/* In case function does not return value, we get clobber of pseudo followed
by set to hard return value. */
static rtx
skip_unreturned_value (orig_insn)
rtx orig_insn;
{
rtx insn = next_nonnote_insn (orig_insn);
/* Skip possible clobber of pseudo return register. */
if (insn
&& GET_CODE (insn) == INSN
&& GET_CODE (PATTERN (insn)) == CLOBBER
&& REG_P (XEXP (PATTERN (insn), 0))
&& (REGNO (XEXP (PATTERN (insn), 0)) >= FIRST_PSEUDO_REGISTER))
{
rtx set_insn = next_nonnote_insn (insn);
rtx set;
if (!set_insn)
return insn;
set = single_set (set_insn);
if (!set
|| SET_SRC (set) != XEXP (PATTERN (insn), 0)
|| SET_DEST (set) != current_function_return_rtx)
return insn;
return set_insn;
}
return orig_insn;
}
/* If the first real insn after ORIG_INSN adjusts the stack pointer
by a constant, return the insn with the stack pointer adjustment.
Otherwise return ORIG_INSN. */
@ -317,6 +347,11 @@ call_ends_block_p (insn, end)
if (insn == end)
return 1;
/* Skip over a CLOBBER of the return value as a hard reg. */
insn = skip_unreturned_value (insn);
if (insn == end)
return 1;
/* Skip over a USE of the return value (as a hard reg). */
insn = skip_use_of_return_value (insn, USE);
if (insn == end)