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arm.c (arm_rtx_costs_1): Treat a minus with a shift the same as a minus without a shift.

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* config/arm/arm.c (arm_rtx_costs_1): Treat a minus with a shift
	the same as a minus without a shift.

From-SVN: r146055
This commit is contained in:
Kazu Hirata 2009-04-14 17:30:37 +00:00 committed by Kazu Hirata
parent f9b20c620a
commit b32f6fffc9
2 changed files with 16 additions and 0 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2009-04-14 Kazu Hirata <kazu@codesourcery.com>
* config/arm/arm.c (arm_rtx_costs_1): Treat a minus with a shift
the same as a minus without a shift.
2009-04-14 Nick Clifton <nickc@redhat.com>
* config/stormy16/stormy16.md (ineqbranch_1): Do not assume that

11
gcc/config/arm/arm.c
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@ -5139,6 +5139,17 @@ arm_rtx_costs_1 (rtx x, enum rtx_code outer, int* total, bool speed)
return true;
}
/* A shift as a part of RSB costs no more than RSB itself. */
if (GET_CODE (XEXP (x, 0)) == MULT
&& GET_CODE (XEXP (XEXP (x, 0), 1)) == CONST_INT
&& ((INTVAL (XEXP (XEXP (x, 0), 1))
& (INTVAL (XEXP (XEXP (x, 0), 1)) - 1)) == 0))
{
*total += rtx_cost (XEXP (XEXP (x, 0), 0), code, speed);
*total += rtx_cost (XEXP (x, 1), code, speed);
return true;
}
if (subcode == MULT
&& GET_CODE (XEXP (XEXP (x, 1), 1)) == CONST_INT
&& ((INTVAL (XEXP (XEXP (x, 1), 1)) &