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(find_equiv_reg): Exclude registers clobbered in the 

CALL_INSN_FUNCTION_USAGE field of a CALL_INSN.

From-SVN: r8696
This commit is contained in:
Jim Wilson 1994-12-28 18:17:58 -08:00
parent 581d4b9d55
commit 369c7ab612
1 changed files with 45 additions and 0 deletions
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45
gcc/reload.c
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@ -5584,6 +5584,51 @@ find_equiv_reg (goal, insn, class, other, reload_reg_p, goalreg, mode)
}
}
if (GET_CODE (p) == CALL_INSN && CALL_INSN_FUNCTION_USAGE (p))
{
rtx link;
for (link = CALL_INSN_FUNCTION_USAGE (p); XEXP (link, 1) != 0;
link = XEXP (link, 1))
{
pat = XEXP (link, 0);
if (GET_CODE (pat) == CLOBBER)
{
register rtx dest = SET_DEST (pat);
while (GET_CODE (dest) == SUBREG
|| GET_CODE (dest) == ZERO_EXTRACT
|| GET_CODE (dest) == SIGN_EXTRACT
|| GET_CODE (dest) == STRICT_LOW_PART)
dest = XEXP (dest, 0);
if (GET_CODE (dest) == REG)
{
register int xregno = REGNO (dest);
int xnregs;
if (REGNO (dest) < FIRST_PSEUDO_REGISTER)
xnregs = HARD_REGNO_NREGS (xregno, GET_MODE (dest));
else
xnregs = 1;
if (xregno < regno + nregs
&& xregno + xnregs > regno)
return 0;
if (xregno < valueno + valuenregs
&& xregno + xnregs > valueno)
return 0;
if (goal_mem_addr_varies
&& reg_overlap_mentioned_for_reload_p (dest,
goal))
return 0;
}
else if (goal_mem && GET_CODE (dest) == MEM
&& ! push_operand (dest, GET_MODE (dest)))
return 0;
else if (need_stable_sp
&& push_operand (dest, GET_MODE (dest)))
return 0;
}
}
}
#ifdef AUTO_INC_DEC
/* If this insn auto-increments or auto-decrements
either regno or valueno, return 0 now.