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i386: Correct costs on CONST_DOUBLE and CONST_VECTOR

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We were always falling through to the memory default.
Also use standard_sse_constant_p on CONST_VECTOR.

        * config/i386/i386.c (ix86_rtx_costs): Use standard_sse_constant_p
        and don't fall thru from standard_80387_constant_p to the memory
        fallback,

From-SVN: r189007
This commit is contained in:
Richard Henderson 2012-06-26 20:20:08 -07:00 committed by Richard Henderson
parent 87b7851620
commit a247af8371
2 changed files with 37 additions and 17 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2012-06-26 Richard Henderson <rth@redhat.com>
* config/i386/i386.c (ix86_rtx_costs): Use standard_sse_constant_p
and don't fall thru from standard_80387_constant_p to the memory
fallback,
2012-06-26 Richard Henderson <rth@redhat.com>
* config/i386/i386.c (bdesc_args): Update. Change

48
gcc/config/i386/i386.c
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@ -32102,24 +32102,38 @@ ix86_rtx_costs (rtx x, int code_i, int outer_code_i, int opno, int *total,
case CONST_DOUBLE:
if (mode == VOIDmode)
*total = 0;
else
switch (standard_80387_constant_p (x))
{
case 1: /* 0.0 */
*total = 1;
break;
default: /* Other constants */
*total = 2;
break;
case 0:
case -1:
break;
}
/* FALLTHRU */
{
*total = 0;
return true;
}
switch (standard_80387_constant_p (x))
{
case 1: /* 0.0 */
*total = 1;
return true;
default: /* Other constants */
*total = 2;
return true;
case 0:
case -1:
break;
}
if (SSE_FLOAT_MODE_P (mode))
{
case CONST_VECTOR:
/* Start with (MEM (SYMBOL_REF)), since that's where
switch (standard_sse_constant_p (x))
{
case 0:
break;
case 1: /* 0: xor eliminates false dependency */
*total = 0;
return true;
default: /* -1: cmp contains false dependency */
*total = 1;
return true;
}
}
/* Fall back to (MEM (SYMBOL_REF)), since that's where
it'll probably end up. Add a penalty for size. */
*total = (COSTS_N_INSNS (1)
+ (flag_pic != 0 && !TARGET_64BIT)