Module: libav Branch: master Commit: a5bfa66df516b7be55fd08fc62c2b012fc18e340
Author: Christophe Gisquet <[email protected]> Committer: Mans Rullgard <[email protected]> Date: Tue Jun 26 16:10:33 2012 +0200 x86: fft: replace call to memcpy by a loop The function call was a mess to handle, and memcpy cannot make the assumptions we do in the new code. Tested on an IMC sample: 430c -> 370c. Signed-off-by: Mans Rullgard <[email protected]> --- libavcodec/x86/fft_mmx.asm | 37 ++++++++++++------------------------- 1 files changed, 12 insertions(+), 25 deletions(-) diff --git a/libavcodec/x86/fft_mmx.asm b/libavcodec/x86/fft_mmx.asm index 007f5ca..1a430b9 100644 --- a/libavcodec/x86/fft_mmx.asm +++ b/libavcodec/x86/fft_mmx.asm @@ -615,8 +615,6 @@ cglobal fft_calc, 2,5,8 .end: REP_RET -cextern_naked memcpy - cglobal fft_permute, 2,7,1 mov r4, [r0 + FFTContext.revtab] mov r5, [r0 + FFTContext.tmpbuf] @@ -637,29 +635,18 @@ cglobal fft_permute, 2,7,1 cmp r0, r2 jl .loop shl r2, 3 -%if ARCH_X86_64 - mov r0, r1 - mov r1, r5 -%endif -%if WIN64 - sub rsp, 8 - call memcpy - add rsp, 8 - RET -%elif ARCH_X86_64 -%ifdef PIC - jmp memcpy wrt ..plt -%else - jmp memcpy -%endif -%else - push r2 - push r5 - push r1 - call memcpy - add esp, 12 - RET -%endif + 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 + REP_RET cglobal imdct_calc, 3,5,3 mov r3d, [r0 + FFTContext.mdctsize] _______________________________________________ libav-commits mailing list [email protected] https://lists.libav.org/mailman/listinfo/libav-commits
