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bef86ba86c
FFmpeg/libavcodec/x86/fft.asm
Lynne bbe95f7353
x86: replace explicit REP_RETs with RETs 
From x86inc:
> On AMD cpus <=K10, an ordinary ret is slow if it immediately follows either
> a branch or a branch target. So switch to a 2-byte form of ret in that case.
> We can automatically detect "follows a branch", but not a branch target.
> (SSSE3 is a sufficient condition to know that your cpu doesn't have this problem.)

x86inc can automatically determine whether to use REP_RET rather than
REP in most of these cases, so impact is minimal. Additionally, a few
REP_RETs were used unnecessary, despite the return being nowhere near a
branch.

The only CPUs affected were AMD K10s, made between 2007 and 2011, 16
years ago and 12 years ago, respectively.

In the future, everyone involved with x86inc should consider dropping
REP_RETs altogether.
2023-02-01 04:23:55 +01:00

839 lines
20 KiB
NASM
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;******************************************************************************
;* FFT transform with SSE/AVX optimizations
;* Copyright (c) 2008 Loren Merritt
;* Copyright (c) 2011 Vitor Sessak
;*
;* This algorithm (though not any of the implementation details) is
;* based on libdjbfft by D. J. Bernstein.
;*
;* This file is part of FFmpeg.
;*
;* FFmpeg is free software; you can redistribute it and/or
;* modify it under the terms of the GNU Lesser General Public
;* License as published by the Free Software Foundation; either
;* version 2.1 of the License, or (at your option) any later version.
;*
;* FFmpeg 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
;* Lesser General Public License for more details.
;*
;* You should have received a copy of the GNU Lesser General Public
;* License along with FFmpeg; if not, write to the Free Software
;* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
;******************************************************************************
; These functions are not individually interchangeable with the C versions.
; While C takes arrays of FFTComplex, SSE/3DNow leave intermediate results
; in blocks as conventient to the vector size.
; i.e. {4x real, 4x imaginary, 4x real, ...} (or 2x respectively)
%include "libavutil/x86/x86util.asm"
%if ARCH_X86_64
%define pointer resq
%else
%define pointer resd
%endif
struc FFTContext
.nbits: resd 1
.reverse: resd 1
.revtab: pointer 1
.tmpbuf: pointer 1
.mdctsize: resd 1
.mdctbits: resd 1
.tcos: pointer 1
.tsin: pointer 1
.fftperm: pointer 1
.fftcalc: pointer 1
.imdctcalc:pointer 1
.imdcthalf:pointer 1
endstruc
SECTION_RODATA 32
%define M_SQRT1_2 0.70710678118654752440
%define M_COS_PI_1_8 0.923879532511287
%define M_COS_PI_3_8 0.38268343236509
ps_cos16_1: dd 1.0, M_COS_PI_1_8, M_SQRT1_2, M_COS_PI_3_8, 1.0, M_COS_PI_1_8, M_SQRT1_2, M_COS_PI_3_8
ps_cos16_2: dd 0, M_COS_PI_3_8, M_SQRT1_2, M_COS_PI_1_8, 0, -M_COS_PI_3_8, -M_SQRT1_2, -M_COS_PI_1_8
ps_root2: times 8 dd M_SQRT1_2
ps_root2mppm: dd -M_SQRT1_2, M_SQRT1_2, M_SQRT1_2, -M_SQRT1_2, -M_SQRT1_2, M_SQRT1_2, M_SQRT1_2, -M_SQRT1_2
ps_p1p1m1p1: dd 0, 0, 1<<31, 0, 0, 0, 1<<31, 0
perm1: dd 0x00, 0x02, 0x03, 0x01, 0x03, 0x00, 0x02, 0x01
perm2: dd 0x00, 0x01, 0x02, 0x03, 0x01, 0x00, 0x02, 0x03
ps_p1p1m1p1root2: dd 1.0, 1.0, -1.0, 1.0, M_SQRT1_2, M_SQRT1_2, M_SQRT1_2, M_SQRT1_2
ps_m1m1p1m1p1m1m1m1: dd 1<<31, 1<<31, 0, 1<<31, 0, 1<<31, 1<<31, 1<<31
ps_m1p1: dd 1<<31, 0
cextern ps_neg
%assign i 16
%rep 14
cextern cos_ %+ i
%assign i i<<1
%endrep
%if ARCH_X86_64
%define pointer dq
%else
%define pointer dd
%endif
%macro IF0 1+
%endmacro
%macro IF1 1+
%1
%endmacro
SECTION .text
; in: %1 = {r0,i0,r2,i2,r4,i4,r6,i6}
; %2 = {r1,i1,r3,i3,r5,i5,r7,i7}
; %3, %4, %5 tmp
; out: %1 = {r0,r1,r2,r3,i0,i1,i2,i3}
; %2 = {r4,r5,r6,r7,i4,i5,i6,i7}
%macro T8_AVX 5
vsubps %5, %1, %2 ; v = %1 - %2
vaddps %3, %1, %2 ; w = %1 + %2
vmulps %2, %5, [ps_p1p1m1p1root2] ; v *= vals1
vpermilps %2, %2, [perm1]
vblendps %1, %2, %3, 0x33 ; q = {w1,w2,v4,v2,w5,w6,v7,v6}
vshufps %5, %3, %2, 0x4e ; r = {w3,w4,v1,v3,w7,w8,v8,v5}
vsubps %4, %5, %1 ; s = r - q
vaddps %1, %5, %1 ; u = r + q
vpermilps %1, %1, [perm2] ; k = {u1,u2,u3,u4,u6,u5,u7,u8}
vshufps %5, %4, %1, 0xbb
vshufps %3, %4, %1, 0xee
vperm2f128 %3, %3, %5, 0x13
vxorps %4, %4, [ps_m1m1p1m1p1m1m1m1] ; s *= {1,1,-1,-1,1,-1,-1,-1}
vshufps %2, %1, %4, 0xdd
vshufps %1, %1, %4, 0x88
vperm2f128 %4, %2, %1, 0x02 ; v = {k1,k3,s1,s3,k2,k4,s2,s4}
vperm2f128 %1, %1, %2, 0x13 ; w = {k6,k8,s6,s8,k5,k7,s5,s7}
vsubps %5, %1, %3
vblendps %1, %5, %1, 0x55 ; w -= {0,s7,0,k7,0,s8,0,k8}
vsubps %2, %4, %1 ; %2 = v - w
vaddps %1, %4, %1 ; %1 = v + w
%endmacro
; In SSE mode do one fft4 transforms
; in: %1={r0,i0,r2,i2} %2={r1,i1,r3,i3}
; out: %1={r0,r1,r2,r3} %2={i0,i1,i2,i3}
;
; In AVX mode do two fft4 transforms
; in: %1={r0,i0,r2,i2,r4,i4,r6,i6} %2={r1,i1,r3,i3,r5,i5,r7,i7}
; out: %1={r0,r1,r2,r3,r4,r5,r6,r7} %2={i0,i1,i2,i3,i4,i5,i6,i7}
%macro T4_SSE 3
subps %3, %1, %2 ; {t3,t4,-t8,t7}
addps %1, %1, %2 ; {t1,t2,t6,t5}
xorps %3, %3, [ps_p1p1m1p1]
shufps %2, %1, %3, 0xbe ; {t6,t5,t7,t8}
shufps %1, %1, %3, 0x44 ; {t1,t2,t3,t4}
subps %3, %1, %2 ; {r2,i2,r3,i3}
addps %1, %1, %2 ; {r0,i0,r1,i1}
shufps %2, %1, %3, 0xdd ; {i0,i1,i2,i3}
shufps %1, %1, %3, 0x88 ; {r0,r1,r2,r3}
%endmacro
; In SSE mode do one FFT8
; in: %1={r0,r1,r2,r3} %2={i0,i1,i2,i3} %3={r4,i4,r6,i6} %4={r5,i5,r7,i7}
; out: %1={r0,r1,r2,r3} %2={i0,i1,i2,i3} %1={r4,r5,r6,r7} %2={i4,i5,i6,i7}
;
; In AVX mode do two FFT8
; in: %1={r0,i0,r2,i2,r8, i8, r10,i10} %2={r1,i1,r3,i3,r9, i9, r11,i11}
; %3={r4,i4,r6,i6,r12,i12,r14,i14} %4={r5,i5,r7,i7,r13,i13,r15,i15}
; out: %1={r0,r1,r2,r3,r8, r9, r10,r11} %2={i0,i1,i2,i3,i8, i9, i10,i11}
; %3={r4,r5,r6,r7,r12,r13,r14,r15} %4={i4,i5,i6,i7,i12,i13,i14,i15}
%macro T8_SSE 6
addps %6, %3, %4 ; {t1,t2,t3,t4}
subps %3, %3, %4 ; {r5,i5,r7,i7}
shufps %4, %3, %3, 0xb1 ; {i5,r5,i7,r7}
mulps %3, %3, [ps_root2mppm] ; {-r5,i5,r7,-i7}
mulps %4, %4, [ps_root2]
addps %3, %3, %4 ; {t8,t7,ta,t9}
shufps %4, %6, %3, 0x9c ; {t1,t4,t7,ta}
shufps %6, %6, %3, 0x36 ; {t3,t2,t9,t8}
subps %3, %6, %4 ; {t6,t5,tc,tb}
addps %6, %6, %4 ; {t1,t2,t9,ta}
shufps %5, %6, %3, 0x8d ; {t2,ta,t6,tc}
shufps %6, %6, %3, 0xd8 ; {t1,t9,t5,tb}
subps %3, %1, %6 ; {r4,r5,r6,r7}
addps %1, %1, %6 ; {r0,r1,r2,r3}
subps %4, %2, %5 ; {i4,i5,i6,i7}
addps %2, %2, %5 ; {i0,i1,i2,i3}
%endmacro
%macro INTERL 5
%if cpuflag(avx)
vunpckhps %3, %2, %1
vunpcklps %2, %2, %1
vextractf128 %4(%5), %2, 0
vextractf128 %4 %+ H(%5), %3, 0
vextractf128 %4(%5 + 1), %2, 1
vextractf128 %4 %+ H(%5 + 1), %3, 1
%elif cpuflag(sse)
mova %3, %2
unpcklps %2, %1
unpckhps %3, %1
mova %4(%5), %2
mova %4(%5+1), %3
%endif
%endmacro
; scheduled for cpu-bound sizes
%macro PASS_SMALL 3 ; (to load m4-m7), wre, wim
IF%1 mova m4, Z(4)
IF%1 mova m5, Z(5)
mova m0, %2 ; wre
mova m1, %3 ; wim
mulps m2, m4, m0 ; r2*wre
IF%1 mova m6, Z2(6)
mulps m3, m5, m1 ; i2*wim
IF%1 mova m7, Z2(7)
mulps m4, m4, m1 ; r2*wim
mulps m5, m5, m0 ; i2*wre
addps m2, m2, m3 ; r2*wre + i2*wim
mulps m3, m1, m7 ; i3*wim
subps m5, m5, m4 ; i2*wre - r2*wim
mulps m1, m1, m6 ; r3*wim
mulps m4, m0, m6 ; r3*wre
mulps m0, m0, m7 ; i3*wre
subps m4, m4, m3 ; r3*wre - i3*wim
mova m3, Z(0)
addps m0, m0, m1 ; i3*wre + r3*wim
subps m1, m4, m2 ; t3
addps m4, m4, m2 ; t5
subps m3, m3, m4 ; r2
addps m4, m4, Z(0) ; r0
mova m6, Z(2)
mova Z(4), m3
mova Z(0), m4
subps m3, m5, m0 ; t4
subps m4, m6, m3 ; r3
addps m3, m3, m6 ; r1
mova Z2(6), m4
mova Z(2), m3
mova m2, Z(3)
addps m3, m5, m0 ; t6
subps m2, m2, m1 ; i3
mova m7, Z(1)
addps m1, m1, Z(3) ; i1
mova Z2(7), m2
mova Z(3), m1
subps m4, m7, m3 ; i2
addps m3, m3, m7 ; i0
mova Z(5), m4
mova Z(1), m3
%endmacro
; scheduled to avoid store->load aliasing
%macro PASS_BIG 1 ; (!interleave)
mova m4, Z(4) ; r2
mova m5, Z(5) ; i2
mova m0, [wq] ; wre
mova m1, [wq+o1q] ; wim
mulps m2, m4, m0 ; r2*wre
mova m6, Z2(6) ; r3
mulps m3, m5, m1 ; i2*wim
mova m7, Z2(7) ; i3
mulps m4, m4, m1 ; r2*wim
mulps m5, m5, m0 ; i2*wre
addps m2, m2, m3 ; r2*wre + i2*wim
mulps m3, m1, m7 ; i3*wim
mulps m1, m1, m6 ; r3*wim
subps m5, m5, m4 ; i2*wre - r2*wim
mulps m4, m0, m6 ; r3*wre
mulps m0, m0, m7 ; i3*wre
subps m4, m4, m3 ; r3*wre - i3*wim
mova m3, Z(0)
addps m0, m0, m1 ; i3*wre + r3*wim
subps m1, m4, m2 ; t3
addps m4, m4, m2 ; t5
subps m3, m3, m4 ; r2
addps m4, m4, Z(0) ; r0
mova m6, Z(2)
mova Z(4), m3
mova Z(0), m4
subps m3, m5, m0 ; t4
subps m4, m6, m3 ; r3
addps m3, m3, m6 ; r1
IF%1 mova Z2(6), m4
IF%1 mova Z(2), m3
mova m2, Z(3)
addps m5, m5, m0 ; t6
subps m2, m2, m1 ; i3
mova m7, Z(1)
addps m1, m1, Z(3) ; i1
IF%1 mova Z2(7), m2
IF%1 mova Z(3), m1
subps m6, m7, m5 ; i2
addps m5, m5, m7 ; i0
IF%1 mova Z(5), m6
IF%1 mova Z(1), m5
%if %1==0
INTERL m1, m3, m7, Z, 2
INTERL m2, m4, m0, Z2, 6
mova m1, Z(0)
mova m2, Z(4)
INTERL m5, m1, m3, Z, 0
INTERL m6, m2, m7, Z, 4
%endif
%endmacro
%define Z(x) [r0+mmsize*x]
%define Z2(x) [r0+mmsize*x]
%define ZH(x) [r0+mmsize*x+mmsize/2]
INIT_YMM avx
%if HAVE_AVX_EXTERNAL
align 16
fft8_avx:
mova m0, Z(0)
mova m1, Z(1)
T8_AVX m0, m1, m2, m3, m4
mova Z(0), m0
mova Z(1), m1
ret
align 16
fft16_avx:
mova m2, Z(2)
mova m3, Z(3)
T4_SSE m2, m3, m7
mova m0, Z(0)
mova m1, Z(1)
T8_AVX m0, m1, m4, m5, m7
mova m4, [ps_cos16_1]
mova m5, [ps_cos16_2]
vmulps m6, m2, m4
vmulps m7, m3, m5
vaddps m7, m7, m6
vmulps m2, m2, m5
vmulps m3, m3, m4
vsubps m3, m3, m2
vblendps m2, m7, m3, 0xf0
vperm2f128 m3, m7, m3, 0x21
vaddps m4, m2, m3
vsubps m2, m3, m2
vperm2f128 m2, m2, m2, 0x01
vsubps m3, m1, m2
vaddps m1, m1, m2
vsubps m5, m0, m4
vaddps m0, m0, m4
vextractf128 Z(0), m0, 0
vextractf128 ZH(0), m1, 0
vextractf128 Z(1), m0, 1
vextractf128 ZH(1), m1, 1
vextractf128 Z(2), m5, 0
vextractf128 ZH(2), m3, 0
vextractf128 Z(3), m5, 1
vextractf128 ZH(3), m3, 1
ret
align 16
fft32_avx:
call fft16_avx
mova m0, Z(4)
mova m1, Z(5)
T4_SSE m0, m1, m4
mova m2, Z(6)
mova m3, Z(7)
T8_SSE m0, m1, m2, m3, m4, m6
; m0={r0,r1,r2,r3,r8, r9, r10,r11} m1={i0,i1,i2,i3,i8, i9, i10,i11}
; m2={r4,r5,r6,r7,r12,r13,r14,r15} m3={i4,i5,i6,i7,i12,i13,i14,i15}
vperm2f128 m4, m0, m2, 0x20
vperm2f128 m5, m1, m3, 0x20
vperm2f128 m6, m0, m2, 0x31
vperm2f128 m7, m1, m3, 0x31
PASS_SMALL 0, [cos_32], [cos_32+32]
ret
fft32_interleave_avx:
call fft32_avx
mov r2d, 32
.deint_loop:
mova m2, Z(0)
mova m3, Z(1)
vunpcklps m0, m2, m3
vunpckhps m1, m2, m3
vextractf128 Z(0), m0, 0
vextractf128 ZH(0), m1, 0
vextractf128 Z(1), m0, 1
vextractf128 ZH(1), m1, 1
add r0, mmsize*2
sub r2d, mmsize/4
jg .deint_loop
ret
%endif
INIT_XMM sse
align 16
fft4_avx:
fft4_sse:
mova m0, Z(0)
mova m1, Z(1)
T4_SSE m0, m1, m2
mova Z(0), m0
mova Z(1), m1
ret
align 16
fft8_sse:
mova m0, Z(0)
mova m1, Z(1)
T4_SSE m0, m1, m2
mova m2, Z(2)
mova m3, Z(3)
T8_SSE m0, m1, m2, m3, m4, m5
mova Z(0), m0
mova Z(1), m1
mova Z(2), m2
mova Z(3), m3
ret
align 16
fft16_sse:
mova m0, Z(0)
mova m1, Z(1)
T4_SSE m0, m1, m2
mova m2, Z(2)
mova m3, Z(3)
T8_SSE m0, m1, m2, m3, m4, m5
mova m4, Z(4)
mova m5, Z(5)
mova Z(0), m0
mova Z(1), m1
mova Z(2), m2
mova Z(3), m3
T4_SSE m4, m5, m6
mova m6, Z2(6)
mova m7, Z2(7)
T4_SSE m6, m7, m0
PASS_SMALL 0, [cos_16], [cos_16+16]
ret
%define Z(x) [zcq + o1q*(x&6) + mmsize*(x&1)]
%define Z2(x) [zcq + o3q + mmsize*(x&1)]
%define ZH(x) [zcq + o1q*(x&6) + mmsize*(x&1) + mmsize/2]
%define Z2H(x) [zcq + o3q + mmsize*(x&1) + mmsize/2]
%macro DECL_PASS 2+ ; name, payload
align 16
%1:
DEFINE_ARGS zc, w, n, o1, o3
lea o3q, [nq*3]
lea o1q, [nq*8]
shl o3q, 4
.loop:
%2
add zcq, mmsize*2
add wq, mmsize
sub nd, mmsize/8
jg .loop
rep ret
%endmacro
%macro FFT_DISPATCH 2; clobbers 5 GPRs, 8 XMMs
lea r2, [dispatch_tab%1]
mov r2, [r2 + (%2q-2)*gprsize]
%ifdef PIC
lea r3, [$$]
add r2, r3
%endif
call r2
%endmacro ; FFT_DISPATCH
INIT_YMM avx
%if HAVE_AVX_EXTERNAL
DECL_PASS pass_avx, PASS_BIG 1
DECL_PASS pass_interleave_avx, PASS_BIG 0
cglobal fft_calc, 2,5,8
mov r3d, [r0 + FFTContext.nbits]
mov r0, r1
mov r1, r3
FFT_DISPATCH _interleave %+ SUFFIX, r1
RET
%endif
INIT_XMM sse
DECL_PASS pass_sse, PASS_BIG 1
DECL_PASS pass_interleave_sse, PASS_BIG 0
INIT_XMM sse
cglobal fft_calc, 2,5,8
mov r3d, [r0 + FFTContext.nbits]
PUSH r1
PUSH r3
mov r0, r1
mov r1, r3
FFT_DISPATCH _interleave %+ SUFFIX, r1
POP rcx
POP r4
cmp rcx, 3+(mmsize/16)
jg .end
mov r2, -1
add rcx, 3
shl r2, cl
sub r4, r2
.loop:
movaps xmm0, [r4 + r2]
movaps xmm1, xmm0
unpcklps xmm0, [r4 + r2 + 16]
unpckhps xmm1, [r4 + r2 + 16]
movaps [r4 + r2], xmm0
movaps [r4 + r2 + 16], xmm1
add r2, mmsize*2
jl .loop
.end:
RET
cglobal fft_permute, 2,7,1
mov r4, [r0 + FFTContext.revtab]
mov r5, [r0 + FFTContext.tmpbuf]
mov ecx, [r0 + FFTContext.nbits]
mov r2, 1
shl r2, cl
xor r0, r0
%if ARCH_X86_32
mov r1, r1m
%endif
.loop:
movaps xmm0, [r1 + 8*r0]
movzx r6, word [r4 + 2*r0]
movzx r3, word [r4 + 2*r0 + 2]
movlps [r5 + 8*r6], xmm0
movhps [r5 + 8*r3], xmm0
add r0, 2
cmp r0, r2
jl .loop
shl r2, 3
add r1, r2
add r5, r2
neg r2
; nbits >= 2 (FFT4) and sizeof(FFTComplex)=8 => at least 32B
.loopcopy:
movaps xmm0, [r5 + r2]
movaps xmm1, [r5 + r2 + 16]
movaps [r1 + r2], xmm0
movaps [r1 + r2 + 16], xmm1
add r2, 32
jl .loopcopy
RET
INIT_XMM sse
cglobal imdct_calc, 3,5,3
mov r3d, [r0 + FFTContext.mdctsize]
mov r4, [r0 + FFTContext.imdcthalf]
add r1, r3
PUSH r3
PUSH r1
%if ARCH_X86_32
push r2
push r1
push r0
%else
sub rsp, 8+32*WIN64 ; allocate win64 shadow space
%endif
call r4
%if ARCH_X86_32
add esp, 12
%else
add rsp, 8+32*WIN64
%endif
POP r1
POP r3
lea r0, [r1 + 2*r3]
mov r2, r3
sub r3, mmsize
neg r2
mova m2, [ps_neg]
.loop:
mova m0, [r1 + r3]
mova m1, [r0 + r2]
shufps m0, m0, 0x1b
shufps m1, m1, 0x1b
xorps m0, m2
mova [r0 + r3], m1
mova [r1 + r2], m0
sub r3, mmsize
add r2, mmsize
jl .loop
RET
%ifdef PIC
%define SECTION_REL - $$
%else
%define SECTION_REL
%endif
%macro DECL_FFT 1-2 ; nbits, suffix
%ifidn %0, 1
%xdefine fullsuffix SUFFIX
%else
%xdefine fullsuffix %2 %+ SUFFIX
%endif
%xdefine list_of_fft fft4 %+ SUFFIX SECTION_REL, fft8 %+ SUFFIX SECTION_REL
%if %1>=5
%xdefine list_of_fft list_of_fft, fft16 %+ SUFFIX SECTION_REL
%endif
%if %1>=6
%xdefine list_of_fft list_of_fft, fft32 %+ fullsuffix SECTION_REL
%endif
%assign n 1<<%1
%rep 18-%1
%assign n2 n/2
%assign n4 n/4
%xdefine list_of_fft list_of_fft, fft %+ n %+ fullsuffix SECTION_REL
align 16
fft %+ n %+ fullsuffix:
call fft %+ n2 %+ SUFFIX
add r0, n*4 - (n&(-2<<%1))
call fft %+ n4 %+ SUFFIX
add r0, n*2 - (n2&(-2<<%1))
call fft %+ n4 %+ SUFFIX
sub r0, n*6 + (n2&(-2<<%1))
lea r1, [cos_ %+ n]
mov r2d, n4/2
jmp pass %+ fullsuffix
%assign n n*2
%endrep
%undef n
align 8
dispatch_tab %+ fullsuffix: pointer list_of_fft
%endmacro ; DECL_FFT
%if HAVE_AVX_EXTERNAL
INIT_YMM avx
DECL_FFT 6
DECL_FFT 6, _interleave
%endif
INIT_XMM sse
DECL_FFT 5
DECL_FFT 5, _interleave
INIT_XMM sse
%undef mulps
%undef addps
%undef subps
%undef unpcklps
%undef unpckhps
%macro PREROTATER 5 ;-2*k, 2*k, input+n4, tcos+n8, tsin+n8
movaps xmm0, [%3+%2*4]
movaps xmm1, [%3+%1*4-0x10]
movaps xmm2, xmm0
shufps xmm0, xmm1, 0x88
shufps xmm1, xmm2, 0x77
movlps xmm4, [%4+%2*2]
movlps xmm5, [%5+%2*2+0x0]
movhps xmm4, [%4+%1*2-0x8]
movhps xmm5, [%5+%1*2-0x8]
movaps xmm2, xmm0
movaps xmm3, xmm1
mulps xmm0, xmm5
mulps xmm1, xmm4
mulps xmm2, xmm4
mulps xmm3, xmm5
subps xmm1, xmm0
addps xmm2, xmm3
movaps xmm0, xmm1
unpcklps xmm1, xmm2
unpckhps xmm0, xmm2
%endmacro
%macro CMUL 6 ;j, xmm0, xmm1, 3, 4, 5
mulps m6, %3, [%5+%1]
mulps m7, %2, [%5+%1]
mulps %2, %2, [%6+%1]
mulps %3, %3, [%6+%1]
subps %2, %2, m6
addps %3, %3, m7
%endmacro
%macro POSROTATESHUF 5 ;j, k, z+n8, tcos+n8, tsin+n8
.post:
%if cpuflag(avx)
vmovaps ymm1, [%3+%1*2]
vmovaps ymm0, [%3+%1*2+0x20]
vmovaps ymm3, [%3+%2*2]
vmovaps ymm2, [%3+%2*2+0x20]
CMUL %1, ymm0, ymm1, %3, %4, %5
CMUL %2, ymm2, ymm3, %3, %4, %5
vshufps ymm1, ymm1, ymm1, 0x1b
vshufps ymm3, ymm3, ymm3, 0x1b
vperm2f128 ymm1, ymm1, ymm1, 0x01
vperm2f128 ymm3, ymm3, ymm3, 0x01
vunpcklps ymm6, ymm2, ymm1
vunpckhps ymm4, ymm2, ymm1
vunpcklps ymm7, ymm0, ymm3
vunpckhps ymm5, ymm0, ymm3
vextractf128 [%3+%1*2], ymm7, 0
vextractf128 [%3+%1*2+0x10], ymm5, 0
vextractf128 [%3+%1*2+0x20], ymm7, 1
vextractf128 [%3+%1*2+0x30], ymm5, 1
vextractf128 [%3+%2*2], ymm6, 0
vextractf128 [%3+%2*2+0x10], ymm4, 0
vextractf128 [%3+%2*2+0x20], ymm6, 1
vextractf128 [%3+%2*2+0x30], ymm4, 1
sub %2, 0x20
add %1, 0x20
jl .post
%else
movaps xmm1, [%3+%1*2]
movaps xmm0, [%3+%1*2+0x10]
CMUL %1, xmm0, xmm1, %3, %4, %5
movaps xmm5, [%3+%2*2]
movaps xmm4, [%3+%2*2+0x10]
CMUL %2, xmm4, xmm5, %3, %4, %5
shufps xmm1, xmm1, 0x1b
shufps xmm5, xmm5, 0x1b
movaps xmm6, xmm4
unpckhps xmm4, xmm1
unpcklps xmm6, xmm1
movaps xmm2, xmm0
unpcklps xmm0, xmm5
unpckhps xmm2, xmm5
movaps [%3+%2*2], xmm6
movaps [%3+%2*2+0x10], xmm4
movaps [%3+%1*2], xmm0
movaps [%3+%1*2+0x10], xmm2
sub %2, 0x10
add %1, 0x10
jl .post
%endif
%endmacro
%macro DECL_IMDCT 0
cglobal imdct_half, 3,12,8; FFTContext *s, FFTSample *output, const FFTSample *input
%if ARCH_X86_64
%define rrevtab r7
%define rtcos r8
%define rtsin r9
%else
%define rrevtab r6
%define rtsin r6
%define rtcos r5
%endif
mov r3d, [r0+FFTContext.mdctsize]
add r2, r3
shr r3, 1
mov rtcos, [r0+FFTContext.tcos]
mov rtsin, [r0+FFTContext.tsin]
add rtcos, r3
add rtsin, r3
%if ARCH_X86_64 == 0
push rtcos
push rtsin
%endif
shr r3, 1
mov rrevtab, [r0+FFTContext.revtab]
add rrevtab, r3
%if ARCH_X86_64 == 0
push rrevtab
%endif
sub r3, 4
%if ARCH_X86_64
xor r4, r4
sub r4, r3
%endif
.pre:
%if ARCH_X86_64 == 0
;unspill
xor r4, r4
sub r4, r3
mov rtcos, [esp+8]
mov rtsin, [esp+4]
%endif
PREROTATER r4, r3, r2, rtcos, rtsin
%if ARCH_X86_64
movzx r5, word [rrevtab+r4-4]
movzx r6, word [rrevtab+r4-2]
movzx r10, word [rrevtab+r3]
movzx r11, word [rrevtab+r3+2]
movlps [r1+r5 *8], xmm0
movhps [r1+r6 *8], xmm0
movlps [r1+r10*8], xmm1
movhps [r1+r11*8], xmm1
add r4, 4
%else
mov r6, [esp]
movzx r5, word [r6+r4-4]
movzx r4, word [r6+r4-2]
movlps [r1+r5*8], xmm0
movhps [r1+r4*8], xmm0
movzx r5, word [r6+r3]
movzx r4, word [r6+r3+2]
movlps [r1+r5*8], xmm1
movhps [r1+r4*8], xmm1
%endif
sub r3, 4
jns .pre
mov r5, r0
mov r6, r1
mov r0, r1
mov r1d, [r5+FFTContext.nbits]
FFT_DISPATCH SUFFIX, r1
mov r0d, [r5+FFTContext.mdctsize]
add r6, r0
shr r0, 1
%if ARCH_X86_64 == 0
%define rtcos r2
%define rtsin r3
mov rtcos, [esp+8]
mov rtsin, [esp+4]
%endif
neg r0
mov r1, -mmsize
sub r1, r0
POSROTATESHUF r0, r1, r6, rtcos, rtsin
%if ARCH_X86_64 == 0
add esp, 12
%endif
RET
%endmacro
DECL_IMDCT
INIT_YMM avx
%if HAVE_AVX_EXTERNAL
DECL_IMDCT
%endif
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