381 lines
10 KiB
C
381 lines
10 KiB
C
/*
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* Copyright (c) 2003, 2007-14 Matteo Frigo
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* Copyright (c) 2003, 2007-14 Massachusetts Institute of Technology
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#if defined(FFTW_LDOUBLE) || defined(FFTW_QUAD)
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# error "SSE/SSE2 only works in single/double precision"
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#endif
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#ifdef FFTW_SINGLE
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# define DS(d,s) s /* single-precision option */
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# define SUFF(name) name ## s
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#else
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# define DS(d,s) d /* double-precision option */
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# define SUFF(name) name ## d
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#endif
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#define SIMD_SUFFIX _sse2 /* for renaming */
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#define VL DS(1,2) /* SIMD vector length, in term of complex numbers */
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#define SIMD_VSTRIDE_OKA(x) DS(SIMD_STRIDE_OKA(x),((x) == 2))
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#define SIMD_STRIDE_OKPAIR SIMD_STRIDE_OK
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#if defined(__GNUC__) && !defined(FFTW_SINGLE) && !defined(__SSE2__)
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# error "compiling simd-sse2.h in double precision without -msse2"
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#elif defined(__GNUC__) && defined(FFTW_SINGLE) && !defined(__SSE__)
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# error "compiling simd-sse2.h in single precision without -msse"
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#endif
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#ifdef _MSC_VER
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#ifndef inline
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#define inline __inline
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#endif
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#endif
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/* some versions of glibc's sys/cdefs.h define __inline to be empty,
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which is wrong because emmintrin.h defines several inline
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procedures */
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#ifndef _MSC_VER
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#undef __inline
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#endif
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#ifdef FFTW_SINGLE
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# include <xmmintrin.h>
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#else
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# include <emmintrin.h>
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#endif
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typedef DS(__m128d,__m128) V;
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#define VADD SUFF(_mm_add_p)
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#define VSUB SUFF(_mm_sub_p)
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#define VMUL SUFF(_mm_mul_p)
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#define VXOR SUFF(_mm_xor_p)
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#define SHUF SUFF(_mm_shuffle_p)
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#define UNPCKL SUFF(_mm_unpacklo_p)
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#define UNPCKH SUFF(_mm_unpackhi_p)
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#define SHUFVALS(fp0,fp1,fp2,fp3) \
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(((fp3) << 6) | ((fp2) << 4) | ((fp1) << 2) | ((fp0)))
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#define VDUPL(x) DS(UNPCKL(x, x), SHUF(x, x, SHUFVALS(0, 0, 2, 2)))
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#define VDUPH(x) DS(UNPCKH(x, x), SHUF(x, x, SHUFVALS(1, 1, 3, 3)))
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#define STOREH(a, v) DS(_mm_storeh_pd(a, v), _mm_storeh_pi((__m64 *)(a), v))
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#define STOREL(a, v) DS(_mm_storel_pd(a, v), _mm_storel_pi((__m64 *)(a), v))
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#ifdef __GNUC__
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/*
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* gcc-3.3 generates slow code for mm_set_ps (write all elements to
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* the stack and load __m128 from the stack).
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*
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* gcc-3.[34] generates slow code for mm_set_ps1 (load into low element
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* and shuffle).
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*
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* This hack forces gcc to generate a constant __m128 at compile time.
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*/
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union rvec {
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R r[DS(2,4)];
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V v;
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};
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# ifdef FFTW_SINGLE
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# define DVK(var, val) V var = __extension__ ({ \
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static const union rvec _var = { {val,val,val,val} }; _var.v; })
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# else
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# define DVK(var, val) V var = __extension__ ({ \
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static const union rvec _var = { {val,val} }; _var.v; })
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# endif
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# define LDK(x) x
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#else
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# define DVK(var, val) const R var = K(val)
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# define LDK(x) DS(_mm_set1_pd,_mm_set_ps1)(x)
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#endif
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static inline V LDA(const R *x, INT ivs, const R *aligned_like)
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{
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(void)aligned_like; /* UNUSED */
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(void)ivs; /* UNUSED */
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return *(const V *)x;
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}
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static inline void STA(R *x, V v, INT ovs, const R *aligned_like)
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{
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(void)aligned_like; /* UNUSED */
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(void)ovs; /* UNUSED */
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*(V *)x = v;
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}
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#ifdef FFTW_SINGLE
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# ifdef _MSC_VER
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/* Temporarily disable the warning "uninitialized local variable
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'name' used" and runtime checks for using a variable before it is
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defined which is erroneously triggered by the LOADL0 / LOADH macros
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as they only modify VAL partly each. */
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# ifndef __INTEL_COMPILER
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# pragma warning(disable : 4700)
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# pragma runtime_checks("u", off)
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# endif
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# endif
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# ifdef __INTEL_COMPILER
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# pragma warning(disable : 592)
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# endif
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static inline V LD(const R *x, INT ivs, const R *aligned_like)
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{
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V var;
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(void)aligned_like; /* UNUSED */
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# ifdef __GNUC__
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/* We use inline asm because gcc-3.x generates slow code for
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_mm_loadh_pi(). gcc-3.x insists upon having an existing variable for
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VAL, which is however never used. Thus, it generates code to move
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values in and out the variable. Worse still, gcc-4.0 stores VAL on
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the stack, causing valgrind to complain about uninitialized reads. */
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__asm__("movlps %1, %0\n\tmovhps %2, %0"
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: "=x"(var) : "m"(x[0]), "m"(x[ivs]));
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# else
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# define LOADH(addr, val) _mm_loadh_pi(val, (const __m64 *)(addr))
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# define LOADL0(addr, val) _mm_loadl_pi(val, (const __m64 *)(addr))
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var = LOADL0(x, var);
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var = LOADH(x + ivs, var);
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# endif
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return var;
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}
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# ifdef _MSC_VER
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# ifndef __INTEL_COMPILER
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# pragma warning(default : 4700)
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# pragma runtime_checks("u", restore)
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# endif
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# endif
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# ifdef __INTEL_COMPILER
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# pragma warning(default : 592)
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# endif
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static inline void ST(R *x, V v, INT ovs, const R *aligned_like)
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{
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(void)aligned_like; /* UNUSED */
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/* WARNING: the extra_iter hack depends upon STOREL occurring
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after STOREH */
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STOREH(x + ovs, v);
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STOREL(x, v);
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}
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#else /* ! FFTW_SINGLE */
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# define LD LDA
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# define ST STA
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#endif
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#define STM2 DS(STA,ST)
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#define STN2(x, v0, v1, ovs) /* nop */
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#ifdef FFTW_SINGLE
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# define STM4(x, v, ovs, aligned_like) /* no-op */
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/* STN4 is a macro, not a function, thanks to Visual C++ developers
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deciding "it would be infrequent that people would want to pass more
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than 3 [__m128 parameters] by value." 3 parameters ought to be enough
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for anybody. */
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# define STN4(x, v0, v1, v2, v3, ovs) \
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{ \
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V xxx0, xxx1, xxx2, xxx3; \
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xxx0 = UNPCKL(v0, v2); \
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xxx1 = UNPCKH(v0, v2); \
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xxx2 = UNPCKL(v1, v3); \
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xxx3 = UNPCKH(v1, v3); \
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STA(x, UNPCKL(xxx0, xxx2), 0, 0); \
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STA(x + ovs, UNPCKH(xxx0, xxx2), 0, 0); \
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STA(x + 2 * ovs, UNPCKL(xxx1, xxx3), 0, 0); \
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STA(x + 3 * ovs, UNPCKH(xxx1, xxx3), 0, 0); \
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}
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#else /* !FFTW_SINGLE */
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static inline void STM4(R *x, V v, INT ovs, const R *aligned_like)
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{
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(void)aligned_like; /* UNUSED */
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STOREL(x, v);
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STOREH(x + ovs, v);
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}
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# define STN4(x, v0, v1, v2, v3, ovs) /* nothing */
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#endif
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static inline V FLIP_RI(V x)
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{
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return SHUF(x, x, DS(1, SHUFVALS(1, 0, 3, 2)));
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}
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static inline V VCONJ(V x)
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{
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/* This will produce -0.0f (or -0.0d) even on broken
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compilers that do not distinguish +0.0 from -0.0.
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I bet some are still around. */
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union uvec {
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unsigned u[4];
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V v;
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};
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/* it looks like gcc-3.3.5 produces slow code unless PM is
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declared static. */
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static const union uvec pm = {
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#ifdef FFTW_SINGLE
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{ 0x00000000, 0x80000000, 0x00000000, 0x80000000 }
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#else
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{ 0x00000000, 0x00000000, 0x00000000, 0x80000000 }
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#endif
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};
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return VXOR(pm.v, x);
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}
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static inline V VBYI(V x)
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{
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x = VCONJ(x);
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x = FLIP_RI(x);
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return x;
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}
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/* FMA support */
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#define VFMA(a, b, c) VADD(c, VMUL(a, b))
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#define VFNMS(a, b, c) VSUB(c, VMUL(a, b))
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#define VFMS(a, b, c) VSUB(VMUL(a, b), c)
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#define VFMAI(b, c) VADD(c, VBYI(b))
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#define VFNMSI(b, c) VSUB(c, VBYI(b))
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#define VFMACONJ(b,c) VADD(VCONJ(b),c)
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#define VFMSCONJ(b,c) VSUB(VCONJ(b),c)
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#define VFNMSCONJ(b,c) VSUB(c, VCONJ(b))
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static inline V VZMUL(V tx, V sr)
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{
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V tr = VDUPL(tx);
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V ti = VDUPH(tx);
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tr = VMUL(sr, tr);
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sr = VBYI(sr);
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return VFMA(ti, sr, tr);
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}
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static inline V VZMULJ(V tx, V sr)
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{
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V tr = VDUPL(tx);
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V ti = VDUPH(tx);
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tr = VMUL(sr, tr);
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sr = VBYI(sr);
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return VFNMS(ti, sr, tr);
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}
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static inline V VZMULI(V tx, V sr)
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{
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V tr = VDUPL(tx);
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V ti = VDUPH(tx);
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ti = VMUL(ti, sr);
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sr = VBYI(sr);
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return VFMS(tr, sr, ti);
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}
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static inline V VZMULIJ(V tx, V sr)
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{
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V tr = VDUPL(tx);
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V ti = VDUPH(tx);
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ti = VMUL(ti, sr);
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sr = VBYI(sr);
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return VFMA(tr, sr, ti);
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}
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/* twiddle storage #1: compact, slower */
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#ifdef FFTW_SINGLE
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# define VTW1(v,x) \
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{TW_COS, v, x}, {TW_COS, v+1, x}, {TW_SIN, v, x}, {TW_SIN, v+1, x}
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static inline V BYTW1(const R *t, V sr)
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{
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const V *twp = (const V *)t;
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V tx = twp[0];
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V tr = UNPCKL(tx, tx);
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V ti = UNPCKH(tx, tx);
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tr = VMUL(tr, sr);
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sr = VBYI(sr);
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return VFMA(ti, sr, tr);
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}
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static inline V BYTWJ1(const R *t, V sr)
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{
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const V *twp = (const V *)t;
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V tx = twp[0];
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V tr = UNPCKL(tx, tx);
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V ti = UNPCKH(tx, tx);
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tr = VMUL(tr, sr);
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sr = VBYI(sr);
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return VFNMS(ti, sr, tr);
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}
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#else /* !FFTW_SINGLE */
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# define VTW1(v,x) {TW_CEXP, v, x}
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static inline V BYTW1(const R *t, V sr)
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{
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V tx = LD(t, 1, t);
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return VZMUL(tx, sr);
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}
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static inline V BYTWJ1(const R *t, V sr)
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{
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V tx = LD(t, 1, t);
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return VZMULJ(tx, sr);
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}
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#endif
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#define TWVL1 (VL)
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/* twiddle storage #2: twice the space, faster (when in cache) */
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#ifdef FFTW_SINGLE
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# define VTW2(v,x) \
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{TW_COS, v, x}, {TW_COS, v, x}, {TW_COS, v+1, x}, {TW_COS, v+1, x}, \
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{TW_SIN, v, -x}, {TW_SIN, v, x}, {TW_SIN, v+1, -x}, {TW_SIN, v+1, x}
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#else /* !FFTW_SINGLE */
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# define VTW2(v,x) \
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{TW_COS, v, x}, {TW_COS, v, x}, {TW_SIN, v, -x}, {TW_SIN, v, x}
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#endif
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#define TWVL2 (2 * VL)
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static inline V BYTW2(const R *t, V sr)
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{
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const V *twp = (const V *)t;
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V si = FLIP_RI(sr);
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V tr = twp[0], ti = twp[1];
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return VFMA(tr, sr, VMUL(ti, si));
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}
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static inline V BYTWJ2(const R *t, V sr)
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{
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const V *twp = (const V *)t;
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V si = FLIP_RI(sr);
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V tr = twp[0], ti = twp[1];
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return VFNMS(ti, si, VMUL(tr, sr));
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}
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/* twiddle storage #3 */
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#ifdef FFTW_SINGLE
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# define VTW3(v,x) {TW_CEXP, v, x}, {TW_CEXP, v+1, x}
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# define TWVL3 (VL)
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#else
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# define VTW3(v,x) VTW1(v,x)
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# define TWVL3 TWVL1
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#endif
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/* twiddle storage for split arrays */
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#ifdef FFTW_SINGLE
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# define VTWS(v,x) \
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{TW_COS, v, x}, {TW_COS, v+1, x}, {TW_COS, v+2, x}, {TW_COS, v+3, x}, \
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{TW_SIN, v, x}, {TW_SIN, v+1, x}, {TW_SIN, v+2, x}, {TW_SIN, v+3, x}
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#else
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# define VTWS(v,x) \
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{TW_COS, v, x}, {TW_COS, v+1, x}, {TW_SIN, v, x}, {TW_SIN, v+1, x}
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#endif
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#define TWVLS (2 * VL)
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#define VLEAVE() /* nothing */
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#include "simd-common.h"
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