Switch to using SIMD-oriented Fast Mersenne Twister for random number generation.

In testing, reduced random number generation time by a factor of 8-10.
Drops support for processors older than Pentium 4.
Drop Mersenne Twister library; use a C++ SFMT library.

--HG--
branch : trunk

1 files changed, 0 insertions, 121 deletions

diff --git a/dep/SFMT/SFMT-sse2.h b/dep/SFMT/SFMT-sse2.h
deleted file mode 100644
index 4e91d9c6121..00000000000
--- a/dep/SFMT/SFMT-sse2.h
+++ /dev/null
@@ -1,121 +0,0 @@
-/** 
- * @file  SFMT-sse2.h
- * @brief SIMD oriented Fast Mersenne Twister(SFMT) for Intel SSE2
- *
- * @author Mutsuo Saito (Hiroshima University)
- * @author Makoto Matsumoto (Hiroshima University)
- *
- * @note We assume LITTLE ENDIAN in this file
- *
- * Copyright (C) 2006, 2007 Mutsuo Saito, Makoto Matsumoto and Hiroshima
- * University. All rights reserved.
- *
- * The new BSD License is applied to this software, see LICENSE.txt
- */
-
-#ifndef SFMT_SSE2_H
-#define SFMT_SSE2_H
-
-PRE_ALWAYS static __m128i mm_recursion(__m128i *a, __m128i *b, __m128i c,
-				   __m128i d, __m128i mask) ALWAYSINLINE;
-
-/**
- * This function represents the recursion formula.
- * @param a a 128-bit part of the interal state array
- * @param b a 128-bit part of the interal state array
- * @param c a 128-bit part of the interal state array
- * @param d a 128-bit part of the interal state array
- * @param mask 128-bit mask
- * @return output
- */
-PRE_ALWAYS static __m128i mm_recursion(__m128i *a, __m128i *b, 
-				   __m128i c, __m128i d, __m128i mask) {
-    __m128i v, x, y, z;
-    
-    x = _mm_load_si128(a);
-    y = _mm_srli_epi32(*b, SR1);
-    z = _mm_srli_si128(c, SR2);
-    v = _mm_slli_epi32(d, SL1);
-    z = _mm_xor_si128(z, x);
-    z = _mm_xor_si128(z, v);
-    x = _mm_slli_si128(x, SL2);
-    y = _mm_and_si128(y, mask);
-    z = _mm_xor_si128(z, x);
-    z = _mm_xor_si128(z, y);
-    return z;
-}
-
-/**
- * This function fills the internal state array with pseudorandom
- * integers.
- */
-inline static void gen_rand_all(void) {
-    int i;
-    __m128i r, r1, r2, mask;
-    mask = _mm_set_epi32(MSK4, MSK3, MSK2, MSK1);
-
-    r1 = _mm_load_si128(&sfmt[N - 2].si);
-    r2 = _mm_load_si128(&sfmt[N - 1].si);
-    for (i = 0; i < N - POS1; i++) {
-	r = mm_recursion(&sfmt[i].si, &sfmt[i + POS1].si, r1, r2, mask);
-	_mm_store_si128(&sfmt[i].si, r);
-	r1 = r2;
-	r2 = r;
-    }
-    for (; i < N; i++) {
-	r = mm_recursion(&sfmt[i].si, &sfmt[i + POS1 - N].si, r1, r2, mask);
-	_mm_store_si128(&sfmt[i].si, r);
-	r1 = r2;
-	r2 = r;
-    }
-}
-
-/**
- * This function fills the user-specified array with pseudorandom
- * integers.
- *
- * @param array an 128-bit array to be filled by pseudorandom numbers.  
- * @param size number of 128-bit pesudorandom numbers to be generated.
- */
-inline static void gen_rand_array(w128_t *array, int size) {
-    int i, j;
-    __m128i r, r1, r2, mask;
-    mask = _mm_set_epi32(MSK4, MSK3, MSK2, MSK1);
-
-    r1 = _mm_load_si128(&sfmt[N - 2].si);
-    r2 = _mm_load_si128(&sfmt[N - 1].si);
-    for (i = 0; i < N - POS1; i++) {
-	r = mm_recursion(&sfmt[i].si, &sfmt[i + POS1].si, r1, r2, mask);
-	_mm_store_si128(&array[i].si, r);
-	r1 = r2;
-	r2 = r;
-    }
-    for (; i < N; i++) {
-	r = mm_recursion(&sfmt[i].si, &array[i + POS1 - N].si, r1, r2, mask);
-	_mm_store_si128(&array[i].si, r);
-	r1 = r2;
-	r2 = r;
-    }
-    /* main loop */
-    for (; i < size - N; i++) {
-	r = mm_recursion(&array[i - N].si, &array[i + POS1 - N].si, r1, r2,
-			 mask);
-	_mm_store_si128(&array[i].si, r);
-	r1 = r2;
-	r2 = r;
-    }
-    for (j = 0; j < 2 * N - size; j++) {
-	r = _mm_load_si128(&array[j + size - N].si);
-	_mm_store_si128(&sfmt[j].si, r);
-    }
-    for (; i < size; i++) {
-	r = mm_recursion(&array[i - N].si, &array[i + POS1 - N].si, r1, r2,
-			 mask);
-	_mm_store_si128(&array[i].si, r);
-	_mm_store_si128(&sfmt[j++].si, r);
-	r1 = r2;
-	r2 = r;
-    }
-}
-
-#endif