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author | Nathan Binkert <nate@binkert.org> | 2009-05-11 10:38:43 -0700 |
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committer | Nathan Binkert <nate@binkert.org> | 2009-05-11 10:38:43 -0700 |
commit | 2f30950143cc70bc42a3c8a4111d7cf8198ec881 (patch) | |
tree | 708f6c22edb3c6feb31dd82866c26623a5329580 /src/mem/ruby/network/orion/power_utils.cc | |
parent | c70241810d4e4f523f173c1646b008dc40faad8e (diff) | |
download | gem5-2f30950143cc70bc42a3c8a4111d7cf8198ec881.tar.xz |
ruby: Import ruby and slicc from GEMS
We eventually plan to replace the m5 cache hierarchy with the GEMS
hierarchy, but for now we will make both live alongside eachother.
Diffstat (limited to 'src/mem/ruby/network/orion/power_utils.cc')
-rw-r--r-- | src/mem/ruby/network/orion/power_utils.cc | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/src/mem/ruby/network/orion/power_utils.cc b/src/mem/ruby/network/orion/power_utils.cc new file mode 100644 index 000000000..1f592fff0 --- /dev/null +++ b/src/mem/ruby/network/orion/power_utils.cc @@ -0,0 +1,157 @@ +/* + * Copyright (c) 1999-2008 Mark D. Hill and David A. Wood + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <stdio.h> +#include "parm_technology.hh" +#include "power_utils.hh" +#include <assert.h> +#include <math.h> + +/* ----------- from SIM_power_util.c ------------ */ + +/* Hamming distance table */ +static char h_tab[256] = {0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 4, 5, 5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6, 7, 7, 8}; + + +static unsigned SIM_power_Hamming_slow( unsigned long int old_val, unsigned long int new_val, unsigned long int mask ) +{ + /* old slow code, I don't understand the new fast code though */ + /* unsigned long int dist; + unsigned Hamming = 0; + + dist = ( old_val ^ new_val ) & mask; + mask = (mask >> 1) + 1; + + while ( mask ) { + if ( mask & dist ) Hamming ++; + mask = mask >> 1; + } + + return Hamming; */ + +#define TWO(k) (BIGONE << (k)) +#define CYCL(k) (BIGNONE/(1 + (TWO(TWO(k))))) +#define BSUM(x,k) ((x)+=(x) >> TWO(k), (x) &= CYCL(k)) + unsigned long int x; + + x = (old_val ^ new_val) & mask; + x = (x & CYCL(0)) + ((x>>TWO(0)) & CYCL(0)); + x = (x & CYCL(1)) + ((x>>TWO(1)) & CYCL(1)); + BSUM(x,2); + BSUM(x,3); + BSUM(x,4); + BSUM(x,5); + + return x; +} + + +int SIM_power_init(void) +{ + unsigned i; + + /* initialize Hamming distance table */ + for (i = 0; i < 256; i++) + h_tab[i] = SIM_power_Hamming_slow(i, 0, 0xFF); + + return 0; +} + + +/* assume unsigned long int is unsigned64_t */ +unsigned SIM_power_Hamming(unsigned long int old_val, unsigned long int new_val, unsigned long int mask) +{ + union { + unsigned long int x; + char id[8]; + } u; + unsigned rval; + + u.x = (old_val ^ new_val) & mask; + + rval = h_tab[u.id[0]]; + rval += h_tab[u.id[1]]; + rval += h_tab[u.id[2]]; + rval += h_tab[u.id[3]]; + rval += h_tab[u.id[4]]; + rval += h_tab[u.id[5]]; + rval += h_tab[u.id[6]]; + rval += h_tab[u.id[7]]; + + return rval; +} + + +unsigned SIM_power_Hamming_group(unsigned long int d1_new, unsigned long int d1_old, unsigned long int d2_new, unsigned long int d2_old, unsigned width, unsigned n_grp) +{ + unsigned rval = 0; + unsigned long int g1_new, g1_old, g2_new, g2_old, mask; + + mask = HAMM_MASK(width); + + while (n_grp--) { + g1_new = d1_new & mask; + g1_old = d1_old & mask; + g2_new = d2_new & mask; + g2_old = d2_old & mask; + + if (g1_new != g1_old || g2_new != g2_old) + rval ++; + + d1_new >>= width; + d1_old >>= width; + d2_new >>= width; + d2_old >>= width; + } + + return rval; +} + +/* ---------------------------------------------- */ + +/* ----------------------------------------------- */ + + + + +double logtwo(double x) +{ + assert(x > 0); + return log10(x)/log10(2); +} + +unsigned SIM_power_logtwo(unsigned long int x) +{ + unsigned rval = 0; + + while (x >> rval && rval < sizeof(unsigned long int) << 3) rval++; + if (x == (BIGONE << rval - 1)) rval--; + + return rval; +} + |