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| author | Kazu Hirata <kazu@codesourcery.com> | 2009-04-14 17:30:37 +0000 |
|---|---|---|
| committer | Kazu Hirata <kazu@gcc.gnu.org> | 2009-04-14 17:30:37 +0000 |
| commit | b32f6fffc949f0173fc14ed5c854e1820835150d (patch) | |
| tree | 0400cc51e330553be97605529ac85da638f55ed7 /gcc | |
| parent | f9b20c620aac52350d4de6956878f791df10ba38 (diff) | |
| download | gcc-b32f6fffc949f0173fc14ed5c854e1820835150d.zip gcc-b32f6fffc949f0173fc14ed5c854e1820835150d.tar.gz gcc-b32f6fffc949f0173fc14ed5c854e1820835150d.tar.bz2 | |
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
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/config/arm/arm.c | 11 |
2 files changed, 16 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index d637606..7712ee7 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -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 diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c index e24f3c7..9bd9624 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)) & |