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x86/tx_float: adjust internal ASM call ABI again

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There are many ways to go about it, and this one seems optimal for both
MDCTs and PFA FFTs without requiring excessive instructions or stack usage.
This commit is contained in:
Lynne 2022-09-23 10:34:08 +02:00
parent 7e7baf8ab8
commit 3241e9225c
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GPG Key ID: A2FEA5F03F034464
1 changed files with 8 additions and 20 deletions
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28
libavutil/x86/tx_float.asm
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@ -22,11 +22,10 @@
; based upon and compare.
; Intra-asm call convention:
; 272 bytes of stack available
; First 10 GPRs available
; 320 bytes of stack available
; 14 GPRs available (last 4 must not be clobbered)
; Additionally, don't clobber ctx, in, out, len, lut
; All vector regs available
; Don't clobber ctx, len, lut
; in and out must point to the end
; TODO:
; carry over registers from smaller transforms to save on ~8 loads/stores
@ -686,8 +685,6 @@ cglobal fft2_asm_float, 0, 0, 0, ctx, out, in, stride
movaps m0, [inq]
FFT2 m0, m1
movaps [outq], m0
add inq, mmsize*1
add outq, mmsize*1
ret
cglobal fft2_float, 4, 4, 2, ctx, out, in, stride
@ -721,8 +718,6 @@ cglobal fft4_ %+ %1 %+ _float, 4, 4, 3, ctx, out, in, stride
movaps [outq + 1*mmsize], m0
%if %3
add inq, mmsize*2
add outq, mmsize*2
ret
%else
RET
@ -764,8 +759,6 @@ cglobal fft8_float, 4, 4, 6, ctx, out, in, tmp
movups [outq + 3*mmsize], m1
%if %1
add inq, mmsize*4
add outq, mmsize*4
ret
%else
RET
@ -806,8 +799,6 @@ cglobal fft8_float, 4, 4, 4, ctx, out, in, tmp
vextractf128 [outq + 16*3], m0, 1
%if %1
add inq, mmsize*2
add outq, mmsize*2
ret
%else
RET
@ -857,8 +848,6 @@ cglobal fft16_float, 4, 4, 8, ctx, out, in, tmp
vextractf128 [outq + 16*7], m1, 1
%if %2
add inq, mmsize*4
add outq, mmsize*4
ret
%else
RET
@ -943,8 +932,6 @@ cglobal fft32_float, 4, 4, 16, ctx, out, in, tmp
vextractf128 [outq + 16*15], m5, 1
%if %2
add inq, mmsize*8
add outq, mmsize*8
ret
%else
RET
@ -1282,12 +1269,13 @@ FFT_SPLIT_RADIX_DEF 131072
add outq, 8*mmsize
add rtabq, 4*mmsize
sub itabq, 4*mmsize
sub lenq, 4*mmsize
sub tgtq, 4*mmsize
jg .synth_deinterleave
%if %2
mov lenq, tgtq
add outq, offq
sub outq, tmpq
neg tmpq
lea inq, [inq + tmpq*4]
ret
%else
RET
@ -1369,7 +1357,7 @@ FFT_SPLIT_RADIX_DEF 131072
vextractf128 [outq + 15*mmsize + 16], tx2_e1, 1
%if %2
add outq, 16*mmsize
sub inq, 16*mmsize
ret
%else
RET