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swscale/x86/input: prevent RGB32_TO_Y_FN from reading into the padding

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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 03:03:12 +02:00
parent a1a76b209b
commit 4abffbbc54
1 changed files with 19 additions and 1 deletions
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20
libswscale/x86/input.asm
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@ -347,8 +347,9 @@ cglobal %2%3%4%5 %+ ToY, 6, 6, %1, dst, src, u1, u2, w, table
%if ARCH_X86_64
movsxd wq, wd
%endif
lea srcq, [srcq+wq*4]
add wq, wq
sub wq, mmsize - 1
lea srcq, [srcq+wq*2]
add dstq, wq
neg wq
mova m4, [rgb_Yrnd]
@ -373,6 +374,23 @@ cglobal %2%3%4%5 %+ ToY, 6, 6, %1, dst, src, u1, u2, w, table
mova [dstq+wq], m0
add wq, mmsize
jl .loop
sub wq, mmsize - 1
jz .end
add srcq, 2*mmsize - 2
add dstq, mmsize - 1
.loop2:
movd m0, [srcq+wq*2+0] ; (byte) { Bx, Gx, Rx, xx }[0-3]
DEINTB 1, 0, 3, 2, 7 ; (word) { Gx, xx (m0/m2) or Bx, Rx (m1/m3) }[0-3]/[4-7]
pmaddwd m1, m5 ; (dword) { Bx*BY + Rx*RY }[0-3]
pmaddwd m0, m6 ; (dword) { Gx*GY }[0-3]
paddd m0, m4 ; += rgb_Yrnd
paddd m0, m1 ; (dword) { Y[0-3] }
psrad m0, 9
packssdw m0, m0 ; (word) { Y[0-7] }
movd [dstq+wq], m0
add wq, 2
jl .loop2
.end:
REP_RET
%endif ; %0 == 3
%endmacro