comparison src/fftw-3.3.5/simd-support/simd-avx.h @ 42:2cd0e3b3e1fd

Current fftw source

+/*
+ * Copyright (c) 2003, 2007-14 Matteo Frigo
+ * Copyright (c) 2003, 2007-14 Massachusetts Institute of Technology
+ *
+ * Improvements to 256-bit AVX by Erik Lindahl, 2015.
+ * Erik Lindahl places his modifications in the public domain.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#if defined(FFTW_LDOUBLE) || defined(FFTW_QUAD)
+#error "AVX only works in single or double precision"
+#endif
+
+#ifdef FFTW_SINGLE
+#  define DS(d,s) s /* single-precision option */
+#  define SUFF(name) name ## s
+#else
+#  define DS(d,s) d /* double-precision option */
+#  define SUFF(name) name ## d
+#endif
+
+#define SIMD_SUFFIX  _avx  /* for renaming */
+#define VL DS(2, 4)        /* SIMD complex vector length */
+#define SIMD_VSTRIDE_OKA(x) ((x) == 2) 
+#define SIMD_STRIDE_OKPAIR SIMD_STRIDE_OK
+
+#if defined(__GNUC__) && !defined(__AVX__) /* sanity check */
+#error "compiling simd-avx.h without -mavx"
+#endif
+
+#ifdef _MSC_VER
+#ifndef inline
+#define inline __inline
+#endif
+#endif
+
+#include <immintrin.h>
+
+typedef DS(__m256d, __m256) V;
+#define VADD SUFF(_mm256_add_p)
+#define VSUB SUFF(_mm256_sub_p)
+#define VMUL SUFF(_mm256_mul_p)
+#define VXOR SUFF(_mm256_xor_p)
+#define VSHUF SUFF(_mm256_shuffle_p)
+#define VPERM1 SUFF(_mm256_permute_p)
+
+#define SHUFVALD(fp0,fp1) \
+   (((fp1) << 3) | ((fp0) << 2) | ((fp1) << 1) | ((fp0)))
+#define SHUFVALS(fp0,fp1,fp2,fp3) \
+   (((fp3) << 6) | ((fp2) << 4) | ((fp1) << 2) | ((fp0)))
+
+#define VDUPL(x) DS(_mm256_movedup_pd(x), _mm256_moveldup_ps(x))
+#define VDUPH(x) DS(_mm256_permute_pd(x,SHUFVALD(1,1)), _mm256_movehdup_ps(x))
+
+#define VLIT(x0, x1) DS(_mm256_set_pd(x0, x1, x0, x1), _mm256_set_ps(x0, x1, x0, x1, x0, x1, x0, x1))
+#define DVK(var, val) V var = VLIT(val, val)
+#define LDK(x) x
+
+static inline V LDA(const R *x, INT ivs, const R *aligned_like)
+{
+     (void)aligned_like; /* UNUSED */
+     (void)ivs; /* UNUSED */
+     return SUFF(_mm256_loadu_p)(x);
+}
+
+static inline void STA(R *x, V v, INT ovs, const R *aligned_like)
+{
+     (void)aligned_like; /* UNUSED */
+     (void)ovs; /* UNUSED */
+     SUFF(_mm256_storeu_p)(x, v);
+}
+
+#if FFTW_SINGLE
+
+#define LOADH(addr, val) _mm_loadh_pi(val, (const __m64 *)(addr))
+#define LOADL(addr, val) _mm_loadl_pi(val, (const __m64 *)(addr))
+#define STOREH(addr, val) _mm_storeh_pi((__m64 *)(addr), val)
+#define STOREL(addr, val) _mm_storel_pi((__m64 *)(addr), val)
+
+/* it seems like the only AVX way to store 4 complex floats is to
+   extract two pairs of complex floats into two __m128 registers, and
+   then use SSE-like half-stores.  Similarly, to load 4 complex
+   floats, we load two pairs of complex floats into two __m128
+   registers, and then pack the two __m128 registers into one __m256
+   value. */
+static inline V LD(const R *x, INT ivs, const R *aligned_like)
+{
+     __m128 l0, l1, h0, h1;
+     (void)aligned_like; /* UNUSED */
+#if defined(__ICC) || (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ > 8)
+     l0 = LOADL(x, SUFF(_mm_undefined_p)());
+     l1 = LOADL(x + ivs, SUFF(_mm_undefined_p)());
+     h0 = LOADL(x + 2*ivs, SUFF(_mm_undefined_p)());
+     h1 = LOADL(x + 3*ivs, SUFF(_mm_undefined_p)());
+#else
+     l0 = LOADL(x, l0);
+     l1 = LOADL(x + ivs, l1);
+     h0 = LOADL(x + 2*ivs, h0);
+     h1 = LOADL(x + 3*ivs, h1);
+#endif
+     l0 = SUFF(_mm_movelh_p)(l0,l1);
+     h0 = SUFF(_mm_movelh_p)(h0,h1);
+     return _mm256_insertf128_ps(_mm256_castps128_ps256(l0), h0, 1);
+}
+
+static inline void ST(R *x, V v, INT ovs, const R *aligned_like)
+{
+     __m128 h = _mm256_extractf128_ps(v, 1);
+     __m128 l = _mm256_castps256_ps128(v);
+     (void)aligned_like; /* UNUSED */
+     /* WARNING: the extra_iter hack depends upon STOREL occurring
+	after STOREH */
+     STOREH(x + 3*ovs, h);
+     STOREL(x + 2*ovs, h);
+     STOREH(x + ovs, l);
+     STOREL(x, l);
+}
+
+#define STM2(x, v, ovs, aligned_like) /* no-op */
+static inline void STN2(R *x, V v0, V v1, INT ovs)
+{
+    V x0 = VSHUF(v0, v1, SHUFVALS(0, 1, 0, 1));
+    V x1 = VSHUF(v0, v1, SHUFVALS(2, 3, 2, 3));
+    __m128 h0 = _mm256_extractf128_ps(x0, 1);
+    __m128 l0 = _mm256_castps256_ps128(x0);
+    __m128 h1 = _mm256_extractf128_ps(x1, 1);
+    __m128 l1 = _mm256_castps256_ps128(x1);
+
+    *(__m128 *)(x + 3*ovs) = h1;
+    *(__m128 *)(x + 2*ovs) = h0;
+    *(__m128 *)(x + 1*ovs) = l1;
+    *(__m128 *)(x + 0*ovs) = l0;
+}
+
+#define STM4(x, v, ovs, aligned_like) /* no-op */
+#define STN4(x, v0, v1, v2, v3, ovs)				\
+{								\
+     V xxx0, xxx1, xxx2, xxx3;					\
+     V yyy0, yyy1, yyy2, yyy3;					\
+     xxx0 = _mm256_unpacklo_ps(v0, v2);				\
+     xxx1 = _mm256_unpackhi_ps(v0, v2);				\
+     xxx2 = _mm256_unpacklo_ps(v1, v3);				\
+     xxx3 = _mm256_unpackhi_ps(v1, v3);				\
+     yyy0 = _mm256_unpacklo_ps(xxx0, xxx2);			\
+     yyy1 = _mm256_unpackhi_ps(xxx0, xxx2);			\
+     yyy2 = _mm256_unpacklo_ps(xxx1, xxx3);			\
+     yyy3 = _mm256_unpackhi_ps(xxx1, xxx3);			\
+     *(__m128 *)(x + 0 * ovs) = _mm256_castps256_ps128(yyy0);	\
+     *(__m128 *)(x + 4 * ovs) = _mm256_extractf128_ps(yyy0, 1);	\
+     *(__m128 *)(x + 1 * ovs) = _mm256_castps256_ps128(yyy1);	\
+     *(__m128 *)(x + 5 * ovs) = _mm256_extractf128_ps(yyy1, 1);	\
+     *(__m128 *)(x + 2 * ovs) = _mm256_castps256_ps128(yyy2);	\
+     *(__m128 *)(x + 6 * ovs) = _mm256_extractf128_ps(yyy2, 1);	\
+     *(__m128 *)(x + 3 * ovs) = _mm256_castps256_ps128(yyy3);	\
+     *(__m128 *)(x + 7 * ovs) = _mm256_extractf128_ps(yyy3, 1);	\
+}
+
+#else
+static inline __m128d VMOVAPD_LD(const R *x)
+{
+     /* gcc-4.6 miscompiles the combination _mm256_castpd128_pd256(VMOVAPD_LD(x))
+	into a 256-bit vmovapd, which requires 32-byte aligment instead of
+	16-byte alignment.
+
+	Force the use of vmovapd via asm until compilers stabilize.
+     */
+#if defined(__GNUC__)
+     __m128d var;
+     __asm__("vmovapd %1, %0\n" : "=x"(var) : "m"(x[0]));
+     return var;
+#else
+     return *(const __m128d *)x;
+#endif
+}
+
+static inline V LD(const R *x, INT ivs, const R *aligned_like)
+{
+     V var;
+     (void)aligned_like; /* UNUSED */
+     var = _mm256_castpd128_pd256(VMOVAPD_LD(x));
+     var = _mm256_insertf128_pd(var, *(const __m128d *)(x+ivs), 1);
+     return var;
+}
+
+static inline void ST(R *x, V v, INT ovs, const R *aligned_like)
+{
+     (void)aligned_like; /* UNUSED */
+     /* WARNING: the extra_iter hack depends upon the store of the low
+	part occurring after the store of the high part */
+     *(__m128d *)(x + ovs) = _mm256_extractf128_pd(v, 1);
+     *(__m128d *)x = _mm256_castpd256_pd128(v);
+}
+
+
+#define STM2 ST
+#define STN2(x, v0, v1, ovs) /* nop */
+#define STM4(x, v, ovs, aligned_like) /* no-op */
+
+/* STN4 is a macro, not a function, thanks to Visual C++ developers
+   deciding "it would be infrequent that people would want to pass more
+   than 3 [__m128 parameters] by value."  Even though the comment
+   was made about __m128 parameters, it appears to apply to __m256
+   parameters as well. */
+#define STN4(x, v0, v1, v2, v3, ovs)					\
+{									\
+     V xxx0, xxx1, xxx2, xxx3;						\
+     xxx0 = _mm256_unpacklo_pd(v0, v1);					\
+     xxx1 = _mm256_unpackhi_pd(v0, v1);					\
+     xxx2 = _mm256_unpacklo_pd(v2, v3);					\
+     xxx3 = _mm256_unpackhi_pd(v2, v3);					\
+     STA(x,           _mm256_permute2f128_pd(xxx0, xxx2, 0x20), 0, 0); \
+     STA(x +     ovs, _mm256_permute2f128_pd(xxx1, xxx3, 0x20), 0, 0); \
+     STA(x + 2 * ovs, _mm256_permute2f128_pd(xxx0, xxx2, 0x31), 0, 0); \
+     STA(x + 3 * ovs, _mm256_permute2f128_pd(xxx1, xxx3, 0x31), 0, 0); \
+}
+#endif
+
+static inline V FLIP_RI(V x)
+{
+     return VPERM1(x,
+		   DS(SHUFVALD(1, 0), 
+		      SHUFVALS(1, 0, 3, 2)));
+}
+
+static inline V VCONJ(V x)
+{
+     V pmpm = VLIT(-0.0, 0.0);
+     return VXOR(pmpm, x);
+}
+
+static inline V VBYI(V x)
+{
+     return FLIP_RI(VCONJ(x));
+}
+
+/* FMA support */
+#define VFMA(a, b, c) VADD(c, VMUL(a, b))
+#define VFNMS(a, b, c) VSUB(c, VMUL(a, b))
+#define VFMS(a, b, c) VSUB(VMUL(a, b), c)
+#define VFMAI(b, c)  SUFF(_mm256_addsub_p)(c,FLIP_RI(b))
+#define VFNMSI(b, c) VSUB(c, VBYI(b))
+#define VFMACONJ(b,c)  VADD(VCONJ(b),c)
+#define VFMSCONJ(b,c)  VSUB(VCONJ(b),c)
+#define VFNMSCONJ(b,c) SUFF(_mm256_addsub_p)(c,b)
+
+static inline V VZMUL(V tx, V sr)
+{
+  V tr = VDUPL(tx);
+  V ti = VDUPH(tx);
+  tr = VMUL(tr, sr);
+  ti = VMUL(ti, FLIP_RI(sr));
+  return SUFF(_mm256_addsub_p)(tr,ti);
+}
+
+static inline V VZMULJ(V tx, V sr)
+{
+     V tr = VDUPL(tx);
+     V ti = VDUPH(tx);
+     tr = VMUL(tr, sr);
+     sr = VBYI(sr);
+     return VFNMS(ti, sr, tr);
+}
+
+static inline V VZMULI(V tx, V sr)
+{
+     V tr = VDUPL(tx);
+     V ti = VDUPH(tx);
+     ti = VMUL(ti, sr);
+     sr = VBYI(sr);
+     return VFMS(tr, sr, ti);
+}
+
+static inline V VZMULIJ(V tx, V sr)
+{
+     V tr = VDUPL(tx);
+     V ti = VDUPH(tx);
+     ti = VMUL(ti, sr);
+     tr = VMUL(tr, FLIP_RI(sr));
+     return SUFF(_mm256_addsub_p)(ti,tr);
+}
+
+/* twiddle storage #1: compact, slower */
+#ifdef FFTW_SINGLE
+# define VTW1(v,x) {TW_CEXP, v, x}, {TW_CEXP, v+1, x}, {TW_CEXP, v+2, x}, {TW_CEXP, v+3, x}
+#else
+# define VTW1(v,x) {TW_CEXP, v, x}, {TW_CEXP, v+1, x}
+#endif
+#define TWVL1 (VL)
+
+static inline V BYTW1(const R *t, V sr)
+{
+     return VZMUL(LDA(t, 2, t), sr);
+}
+
+static inline V BYTWJ1(const R *t, V sr)
+{
+     return VZMULJ(LDA(t, 2, t), sr);
+}
+
+/* twiddle storage #2: twice the space, faster (when in cache) */
+#ifdef FFTW_SINGLE
+# define VTW2(v,x)							\
+   {TW_COS, v, x}, {TW_COS, v, x}, {TW_COS, v+1, x}, {TW_COS, v+1, x},	\
+   {TW_COS, v+2, x}, {TW_COS, v+2, x}, {TW_COS, v+3, x}, {TW_COS, v+3, x}, \
+   {TW_SIN, v, -x}, {TW_SIN, v, x}, {TW_SIN, v+1, -x}, {TW_SIN, v+1, x}, \
+   {TW_SIN, v+2, -x}, {TW_SIN, v+2, x}, {TW_SIN, v+3, -x}, {TW_SIN, v+3, x}
+#else
+# define VTW2(v,x)							\
+   {TW_COS, v, x}, {TW_COS, v, x}, {TW_COS, v+1, x}, {TW_COS, v+1, x},	\
+   {TW_SIN, v, -x}, {TW_SIN, v, x}, {TW_SIN, v+1, -x}, {TW_SIN, v+1, x}
+#endif
+#define TWVL2 (2 * VL)
+
+static inline V BYTW2(const R *t, V sr)
+{
+     const V *twp = (const V *)t;
+     V si = FLIP_RI(sr);
+     V tr = twp[0], ti = twp[1];
+     return VFMA(tr, sr, VMUL(ti, si));
+}
+
+static inline V BYTWJ2(const R *t, V sr)
+{
+     const V *twp = (const V *)t;
+     V si = FLIP_RI(sr);
+     V tr = twp[0], ti = twp[1];
+     return VFNMS(ti, si, VMUL(tr, sr));
+}
+
+/* twiddle storage #3 */
+#define VTW3 VTW1
+#define TWVL3 TWVL1
+
+/* twiddle storage for split arrays */
+#ifdef FFTW_SINGLE
+# define VTWS(v,x)							\
+  {TW_COS, v, x}, {TW_COS, v+1, x}, {TW_COS, v+2, x}, {TW_COS, v+3, x},	\
+  {TW_COS, v+4, x}, {TW_COS, v+5, x}, {TW_COS, v+6, x}, {TW_COS, v+7, x}, \
+  {TW_SIN, v, x}, {TW_SIN, v+1, x}, {TW_SIN, v+2, x}, {TW_SIN, v+3, x},	\
+  {TW_SIN, v+4, x}, {TW_SIN, v+5, x}, {TW_SIN, v+6, x}, {TW_SIN, v+7, x}
+#else
+# define VTWS(v,x)							\
+  {TW_COS, v, x}, {TW_COS, v+1, x}, {TW_COS, v+2, x}, {TW_COS, v+3, x},	\
+  {TW_SIN, v, x}, {TW_SIN, v+1, x}, {TW_SIN, v+2, x}, {TW_SIN, v+3, x}	
+#endif
+#define TWVLS (2 * VL)
+
+
+/* Use VZEROUPPER to avoid the penalty of switching from AVX to SSE.
+   See Intel Optimization Manual (April 2011, version 248966), Section
+   11.3 */
+#define VLEAVE _mm256_zeroupper
+
+#include "simd-common.h"