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avcodec/x86: allow future 8-bit simple idct to have "DC only hack"

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Created by Ronald S. Bultje
This commit is contained in:
James Darnley 2017-06-15 00:35:44 +02:00
parent c1d1274bfc
commit 8b19467d07
1 changed files with 40 additions and 0 deletions
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40
libavcodec/x86/simple_idct10_template.asm
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@ -257,6 +257,46 @@
pmullw m12,[%8+96]
IDCT_1D %1, %2, %8
%elif %2 == 11
; This copies the DC-only shortcut. When there is only a DC coefficient the
; C shifts the value and splats it to all coeffs rather than multiplying and
; doing the full IDCT. This causes a difference on 8-bit because the
; coefficient is 16383 rather than 16384 (which you can get with shifting).
por m1, m8, m13
por m1, m12
por m1, [blockq+ 16] ; { row[1] }[0-7]
por m1, [blockq+ 48] ; { row[3] }[0-7]
por m1, [blockq+ 80] ; { row[5] }[0-7]
por m1, [blockq+112] ; { row[7] }[0-7]
pxor m2, m2
pcmpeqw m1, m2
psllw m2, m10, 3
pand m2, m1
pcmpeqb m3, m3
pxor m1, m3
mova [rsp], m1
mova [rsp+16], m2
IDCT_1D %1, %2
mova m5, [rsp]
mova m6, [rsp+16]
pand m8, m5
por m8, m6
pand m0, m5
por m0, m6
pand m1, m5
por m1, m6
pand m2, m5
por m2, m6
pand m4, m5
por m4, m6
pand m11, m5
por m11, m6
pand m9, m5
por m9, m6
pand m10, m5
por m10, m6
%else
IDCT_1D %1, %2
%endif