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From-SVN: r686
This commit is contained in:
Richard Kenner 1992-04-04 16:43:53 -05:00
parent abf977d6a9
commit e8094962f6
1 changed files with 26 additions and 1 deletions
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27
gcc/reload.c
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@ -4463,6 +4463,7 @@ find_equiv_reg (goal, insn, class, other, reload_reg_p, goalreg, mode)
because it was assumed we would find that equivalent. */
|| INSN_UID (p) < reload_first_uid))
{
rtx tem;
pat = single_set (p);
/* First check for something that sets some reg equal to GOAL. */
if (pat != 0
@ -4481,7 +4482,31 @@ find_equiv_reg (goal, insn, class, other, reload_reg_p, goalreg, mode)
&& rtx_renumbered_equal_p (goal, SET_SRC (pat)))
|| (goal_mem
&& (valueno = true_regnum (valtry = SET_SRC (pat))) >= 0
&& rtx_renumbered_equal_p (goal, SET_DEST (pat)))))
&& rtx_renumbered_equal_p (goal, SET_DEST (pat)))
/* If we are looking for a constant,
and something equivalent to that constant was copied
into a reg, we can use that reg. */
|| (goal_const && (tem = find_reg_note (p, REG_EQUIV, 0))
&& rtx_equal_p (XEXP (tem, 0), goal)
&& (valueno = true_regnum (valtry = SET_DEST (pat))))
|| (goal_const && (tem = find_reg_note (p, REG_EQUIV, 0))
&& GET_CODE (SET_DEST (pat)) == REG
&& GET_CODE (XEXP (tem, 0)) == CONST_DOUBLE
&& GET_MODE_CLASS (GET_MODE (XEXP (tem, 0))) == MODE_FLOAT
&& GET_CODE (goal) == CONST_INT
&& INTVAL (goal) == CONST_DOUBLE_LOW (XEXP (tem, 0))
&& (valtry = operand_subword (SET_DEST (pat), 0, 0,
VOIDmode))
&& (valueno = true_regnum (valtry)))
|| (goal_const && (tem = find_reg_note (p, REG_EQUIV, 0))
&& GET_CODE (SET_DEST (pat)) == REG
&& GET_CODE (XEXP (tem, 0)) == CONST_DOUBLE
&& GET_MODE_CLASS (GET_MODE (XEXP (tem, 0))) == MODE_FLOAT
&& GET_CODE (goal) == CONST_INT
&& INTVAL (goal) == CONST_DOUBLE_HIGH (XEXP (tem, 0))
&& (valtry
= operand_subword (SET_DEST (pat), 1, 0, VOIDmode))
&& (valueno = true_regnum (valtry)))))
if (other >= 0
? valueno == other
: ((unsigned) valueno < FIRST_PSEUDO_REGISTER