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(reg_used_between_p): Check usage exprs on CALL_INSNs. 

(reg_referenced_between_p, reg_set_p, dead_or_set_regno_p): Likewise.
(find_reg{,no}_fusage): New functions.

From-SVN: r7235
This commit is contained in:
Richard Kenner 1994-05-06 17:43:38 -04:00
parent e51c6661ff
commit 8f3e7a26bd
1 changed files with 101 additions and 4 deletions
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105
gcc/rtlanal.c
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@ -315,7 +315,10 @@ reg_used_between_p (reg, from_insn, to_insn)
for (insn = NEXT_INSN (from_insn); insn != to_insn; insn = NEXT_INSN (insn))
if (GET_RTX_CLASS (GET_CODE (insn)) == 'i'
&& reg_overlap_mentioned_p (reg, PATTERN (insn)))
&& (reg_overlap_mentioned_p (reg, PATTERN (insn))
|| (GET_CODE (insn) == CALL_INSN
&& (find_reg_fusage (insn, USE, reg)
|| find_reg_fusage (insn, CLOBBER, reg)))))
return 1;
return 0;
}
@ -393,7 +396,9 @@ reg_referenced_between_p (reg, from_insn, to_insn)
for (insn = NEXT_INSN (from_insn); insn != to_insn; insn = NEXT_INSN (insn))
if (GET_RTX_CLASS (GET_CODE (insn)) == 'i'
&& reg_referenced_p (reg, PATTERN (insn)))
&& (reg_referenced_p (reg, PATTERN (insn))
|| (GET_CODE (insn) == CALL_INSN
&& find_reg_fusage (insn, USE, reg))))
return 1;
return 0;
}
@ -448,10 +453,14 @@ reg_set_p (reg, insn)
|| (GET_CODE (insn) == CALL_INSN
/* We'd like to test call_used_regs here, but rtlanal.c can't
reference that variable due to its use in genattrtab. So
we'll just be more conservative. */
we'll just be more conservative.
??? Unless we could ensure that the CALL_INSN_FUNCTION_USAGE
information holds all clobbered registers. */
&& ((GET_CODE (reg) == REG
&& REGNO (reg) < FIRST_PSEUDO_REGISTER)
|| GET_CODE (reg) == MEM)))
|| GET_CODE (reg) == MEM
|| find_reg_fusage (insn, CLOBBER, reg))))
return 1;
body = PATTERN (insn);
@ -1130,6 +1139,10 @@ dead_or_set_regno_p (insn, test_regno)
return 1;
}
if (GET_CODE (insn) == CALL_INSN
&& find_regno_fusage (insn, CLOBBER, test_regno))
return 1;
if (GET_CODE (PATTERN (insn)) == SET)
{
rtx dest = SET_DEST (PATTERN (insn));
@ -1233,6 +1246,90 @@ find_regno_note (insn, kind, regno)
return link;
return 0;
}
/* Return true if DATUM, or any overlap of DATUM, of kind CODE is found
in the CALL_INSN_FUNCTION_USAGE information of INSN. */
int
find_reg_fusage (insn, code, datum)
rtx insn;
enum rtx_code code;
rtx datum;
{
/* If it's not a CALL_INSN, it can't possibly have a
CALL_INSN_FUNCTION_USAGE field, so don't bother checking. */
if (GET_CODE (insn) != CALL_INSN)
return 0;
if (! datum)
abort();
if (GET_CODE (datum) != REG)
{
register rtx link;
for (link = CALL_INSN_FUNCTION_USAGE (insn);
link;
link = XEXP (link, 1))
if (GET_CODE (XEXP (link, 0)) == code
&& rtx_equal_p (datum, SET_DEST (XEXP (link, 0))))
return 1;
}
else
{
register int regno = REGNO (datum);
/* CALL_INSN_FUNCTION_USAGE information cannot contain references
to pseudo registers, so don't bother checking. */
if (regno < FIRST_PSEUDO_REGISTER)
{
int end_regno = regno + HARD_REGNO_NREGS (regno, GET_MODE (datum));
int i;
for (i = regno; i < end_regno; i++)
if (find_regno_fusage (insn, code, i))
return 1;
}
}
return 0;
}
/* Return true if REGNO, or any overlap of REGNO, of kind CODE is found
in the CALL_INSN_FUNCTION_USAGE information of INSN. */
int
find_regno_fusage (insn, code, regno)
rtx insn;
enum rtx_code code;
int regno;
{
register rtx link;
/* CALL_INSN_FUNCTION_USAGE information cannot contain references
to pseudo registers, so don't bother checking. */
if (regno >= FIRST_PSEUDO_REGISTER
|| GET_CODE (insn) != CALL_INSN )
return 0;
for (link = CALL_INSN_FUNCTION_USAGE (insn); link; link = XEXP (link, 1))
{
register int regnote;
register rtx op;
if (GET_CODE (op = XEXP (link, 0)) == code
&& GET_CODE (SET_DEST (op)) == REG
&& (regnote = REGNO (SET_DEST (op))) <= regno
&& regnote
+ HARD_REGNO_NREGS (regnote, GET_MODE (SET_DEST (op)))
> regno)
return 1;
}
return 0;
}
/* Remove register note NOTE from the REG_NOTES of INSN. */