From b32f6fffc949f0173fc14ed5c854e1820835150d Mon Sep 17 00:00:00 2001 From: Kazu Hirata Date: Tue, 14 Apr 2009 17:30:37 +0000 Subject: [PATCH] arm.c (arm_rtx_costs_1): Treat a minus with a shift the same as a minus without a shift. * 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 --- gcc/ChangeLog | 5 +++++ gcc/config/arm/arm.c | 11 +++++++++++ 2 files changed, 16 insertions(+) diff --git a/gcc/ChangeLog b/gcc/ChangeLog index d637606d263..7712ee7e363 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2009-04-14 Kazu Hirata + + * 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 * config/stormy16/stormy16.md (ineqbranch_1): Do not assume that diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c index e24f3c7868e..9bd9624eb2e 100644 --- a/gcc/config/arm/arm.c +++ b/gcc/config/arm/arm.c @@ -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)) &