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swscale/x86/input: prevent RGB32_TO_UV_FN from reading into the padding 

This avoids reading uninitialized bytes and confusing valgrind

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-06-22 02:32:30 +02:00
parent 84de3ed795
commit a1a76b209b
1 changed files with 26 additions and 0 deletions
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26
libswscale/x86/input.asm
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@ -406,6 +406,7 @@ cglobal %2%3%4%5 %+ ToUV, 7, 7, %1, dstU, dstV, u1, src, u2, w, table
mov wq, r5m
%endif
add wq, wq
sub wq, mmsize - 1
add dstUq, wq
add dstVq, wq
lea srcq, [srcq+wq*2]
@ -449,6 +450,31 @@ cglobal %2%3%4%5 %+ ToUV, 7, 7, %1, dstU, dstV, u1, src, u2, w, table
%endif ; mmsize == 8/16
add wq, mmsize
jl .loop
sub wq, mmsize - 1
jz .end
add srcq , 2*mmsize - 2
add dstUq, mmsize - 1
add dstVq, mmsize - 1
.loop2:
movd m0, [srcq+wq*2] ; (byte) { Bx, Gx, Rx, xx }[0-3]
DEINTB 1, 0, 5, 4, 7 ; (word) { Gx, xx (m0/m4) or Bx, Rx (m1/m5) }[0-3]/[4-7]
pmaddwd m3, m1, coeffV1 ; (dword) { Bx*BV + Rx*RV }[0-3]
pmaddwd m2, m0, coeffV2 ; (dword) { Gx*GV }[0-3]
pmaddwd m1, coeffU1 ; (dword) { Bx*BU + Rx*RU }[0-3]
pmaddwd m0, coeffU2 ; (dword) { Gx*GU }[0-3]
paddd m3, m6 ; += rgb_UVrnd
paddd m1, m6 ; += rgb_UVrnd
paddd m2, m3 ; (dword) { V[0-3] }
paddd m0, m1 ; (dword) { U[0-3] }
psrad m0, 9
psrad m2, 9
packssdw m0, m0 ; (word) { U[0-7] }
packssdw m2, m2 ; (word) { V[0-7] }
movd [dstUq+wq], m0
movd [dstVq+wq], m2
add wq, 2
jl .loop2
.end:
REP_RET
%endif ; ARCH_X86_64 && %0 == 3
%endmacro