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re PR target/54089 ([SH] Refactor shift patterns) 

PR target/54089
	* config/sh/sh.c (shiftcosts): Remove case where first operand 
	is a const_int.  Move COSTS_N_INSNS usage into caller ...
	(sh_rtx_costs) ... here.  Return false when shiftcosts cannot be
	calculated instead of MAX_COST.

From-SVN: r189917
This commit is contained in:
Oleg Endo 2012-07-27 17:36:20 +00:00
parent d03cefc12c
commit ebe0dd3802
2 changed files with 23 additions and 13 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2012-07-27 Oleg Endo <olegendo@gcc.gnu.org>
PR target/54089
* config/sh/sh.c (shiftcosts): Remove case where first operand
is a const_int. Move COSTS_N_INSNS usage into caller ...
(sh_rtx_costs) ... here. Return false when shiftcosts cannot be
calculated instead of MAX_COST.
2012-07-27 Richard Guenther <rguenther@suse.de>
* tree-cfg.c (gimple_can_merge_blocks_p): Do more fine-grained

28
gcc/config/sh/sh.c
View File

@ -2859,26 +2859,22 @@ shiftcosts (rtx x)
{
int value;
/* There is no pattern for constant first operand. */
if (CONST_INT_P (XEXP (x, 0)))
return MAX_COST;
if (TARGET_SHMEDIA)
return COSTS_N_INSNS (1);
return 1;
if (GET_MODE_SIZE (GET_MODE (x)) > UNITS_PER_WORD)
{
if (GET_MODE (x) == DImode
&& CONST_INT_P (XEXP (x, 1))
&& INTVAL (XEXP (x, 1)) == 1)
return COSTS_N_INSNS (2);
return 2;
/* Everything else is invalid, because there is no pattern for it. */
return MAX_COST;
return -1;
}
/* If shift by a non constant, then this will be expensive. */
if (!CONST_INT_P (XEXP (x, 1)))
return COSTS_N_INSNS (SH_DYNAMIC_SHIFT_COST);
return SH_DYNAMIC_SHIFT_COST;
/* Otherwise, return the true cost in instructions. Cope with out of range
shift counts more or less arbitrarily. */
@ -2887,13 +2883,14 @@ shiftcosts (rtx x)
if (GET_CODE (x) == ASHIFTRT)
{
int cost = ashiftrt_insns[value];
/* If SH3, then we put the constant in a reg and use shad. */
/* If dynamic shifts are available and profitable in this case, then we
put the constant in a reg and use shad. */
if (cost > 1 + SH_DYNAMIC_SHIFT_COST)
cost = 1 + SH_DYNAMIC_SHIFT_COST;
return COSTS_N_INSNS (cost);
return cost;
}
else
return COSTS_N_INSNS (shift_insns[value]);
return shift_insns[value];
}
/* Return the cost of an AND/XOR/IOR operation. */
@ -3147,8 +3144,13 @@ sh_rtx_costs (rtx x, int code, int outer_code, int opno ATTRIBUTE_UNUSED,
case ASHIFT:
case ASHIFTRT:
case LSHIFTRT:
*total = shiftcosts (x);
return true;
{
int cost = shiftcosts (x);
if (cost < 0)
return false;
*total = COSTS_N_INSNS (cost);
return true;
}
case DIV:
case UDIV: