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re PR target/16800 (PowerPC - Unnecessary rldicl)

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PR target/16800
        * config/rs6000/rs6000.c (rs6000_rtx_costs): Improve accuracy of
        EQ, GTU, and LTU costs.  Add costs for GT, LT, and UNORDERED.
        Distinguish between SImode and DImode CONST_INT.

From-SVN: r91399
This commit is contained in:
David Edelsohn 2004-11-27 23:00:57 +00:00 committed by David Edelsohn
parent 7482ad259b
commit 22e54023ca
2 changed files with 62 additions and 26 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2004-11-28 David Edelsohn <edelsohn@gnu.org>
PR target/16800
* config/rs6000/rs6000.c (rs6000_rtx_costs): Improve accuracy of
EQ, GTU, and LTU costs. Add costs for GT, LT, and UNORDERED.
Distinguish between SImode and DImode CONST_INT.
2004-11-28 Andreas Fischer <a_fisch@gmx.de>
Alan Modra <amodra@bigpond.net.au>

81
gcc/config/rs6000/rs6000.c
View File

@ -18050,16 +18050,15 @@ rs6000_rtx_costs (rtx x, int code, int outer_code, int *total)
|| outer_code == MINUS)
&& (CONST_OK_FOR_LETTER_P (INTVAL (x), 'I')
|| CONST_OK_FOR_LETTER_P (INTVAL (x), 'L')))
|| ((outer_code == IOR || outer_code == XOR)
&& (CONST_OK_FOR_LETTER_P (INTVAL (x), 'K')
|| CONST_OK_FOR_LETTER_P (INTVAL (x), 'L')))
|| ((outer_code == DIV || outer_code == UDIV
|| outer_code == MOD || outer_code == UMOD)
&& exact_log2 (INTVAL (x)) >= 0)
|| (outer_code == AND
&& (CONST_OK_FOR_LETTER_P (INTVAL (x), 'K')
|| CONST_OK_FOR_LETTER_P (INTVAL (x), 'L')
|| (CONST_OK_FOR_LETTER_P (INTVAL (x),
mode == SImode ? 'L' : 'J'))
|| mask_operand (x, VOIDmode)))
|| ((outer_code == IOR || outer_code == XOR)
&& (CONST_OK_FOR_LETTER_P (INTVAL (x), 'K')
|| (CONST_OK_FOR_LETTER_P (INTVAL (x),
mode == SImode ? 'L' : 'J'))))
|| outer_code == ASHIFT
|| outer_code == ASHIFTRT
|| outer_code == LSHIFTRT
@ -18068,9 +18067,21 @@ rs6000_rtx_costs (rtx x, int code, int outer_code, int *total)
|| outer_code == ZERO_EXTRACT
|| (outer_code == MULT
&& CONST_OK_FOR_LETTER_P (INTVAL (x), 'I'))
|| ((outer_code == DIV || outer_code == UDIV
|| outer_code == MOD || outer_code == UMOD)
&& exact_log2 (INTVAL (x)) >= 0)
|| (outer_code == COMPARE
&& (CONST_OK_FOR_LETTER_P (INTVAL (x), 'I')
|| CONST_OK_FOR_LETTER_P (INTVAL (x), 'K'))))
|| CONST_OK_FOR_LETTER_P (INTVAL (x), 'K')))
|| (outer_code == EQ
&& (CONST_OK_FOR_LETTER_P (INTVAL (x), 'I')
|| CONST_OK_FOR_LETTER_P (INTVAL (x), 'K')
|| (CONST_OK_FOR_LETTER_P (INTVAL (x),
mode == SImode ? 'L' : 'J'))))
|| (outer_code == GTU
&& CONST_OK_FOR_LETTER_P (INTVAL (x), 'I'))
|| (outer_code == LTU
&& CONST_OK_FOR_LETTER_P (INTVAL (x), 'P')))
{
*total = 0;
return true;
@ -18348,26 +18359,44 @@ rs6000_rtx_costs (rtx x, int code, int outer_code, int *total)
case EQ:
case GTU:
case LTU:
if (mode == Pmode)
/* Carry bit requires mode == Pmode.
NEG or PLUS already counted so only add one. */
if (mode == Pmode
&& (outer_code == NEG || outer_code == PLUS))
{
switch (outer_code)
{
case PLUS:
case NEG:
/* PLUS or NEG already counted so only add one more. */
*total = COSTS_N_INSNS (1);
break;
case SET:
*total = COSTS_N_INSNS (3);
break;
case COMPARE:
*total = 0;
return true;
default:
break;
}
return false;
*total = COSTS_N_INSNS (1);
return true;
}
if (outer_code == SET)
{
if (XEXP (x, 1) == const0_rtx)
{
*total = COSTS_N_INSNS (2);
return true;
}
else if (mode == Pmode)
{
*total = COSTS_N_INSNS (3);
return false;
}
}
/* FALLTHRU */
case GT:
case LT:
case UNORDERED:
if (outer_code == SET && (XEXP (x, 1) == const0_rtx))
{
*total = COSTS_N_INSNS (2);
return true;
}
/* CC COMPARE. */
if (outer_code == COMPARE)
{
*total = 0;
return true;
}
break;
default:
break;