This improved encoding performance by 0.5% (good, speed 1) to
1.5% (good, speed 5).
Change-Id: I843d72a0d68a90b5f694adf770943e4a4618f50e
push rbp
mov rbp, rsp
SHADOW_ARGS_TO_STACK 6
- GET_GOT rbx
+ push rbx
push rsi
push rdi
- sub rsp, 16
; end prolog
mov rsi, arg(0) ;[src_ptr]
movsxd rax, DWORD PTR arg(1) ;[source_stride]
movsxd rdx, DWORD PTR arg(3) ;[recon_stride]
+ ; Prefetch data
+ lea rcx, [rax+rax*2]
+ prefetcht0 [rsi]
+ prefetcht0 [rsi+rax]
+ prefetcht0 [rsi+rax*2]
+ prefetcht0 [rsi+rcx]
+ lea rbx, [rsi+rax*4]
+ prefetcht0 [rbx]
+ prefetcht0 [rbx+rax]
+ prefetcht0 [rbx+rax*2]
+ prefetcht0 [rbx+rcx]
+
+ lea rcx, [rdx+rdx*2]
+ prefetcht0 [rdi]
+ prefetcht0 [rdi+rdx]
+ prefetcht0 [rdi+rdx*2]
+ prefetcht0 [rdi+rcx]
+ lea rbx, [rdi+rdx*4]
+ prefetcht0 [rbx]
+ prefetcht0 [rbx+rdx]
+ prefetcht0 [rbx+rdx*2]
+ prefetcht0 [rbx+rcx]
+
pxor xmm0, xmm0 ; clear xmm0 for unpack
pxor xmm7, xmm7 ; clear xmm7 for accumulating diffs
movdqu xmm1, XMMWORD PTR [rsi]
movdqu xmm2, XMMWORD PTR [rdi]
+ prefetcht0 [rsi+rax*8]
+ prefetcht0 [rdi+rdx*8]
+
movdqa xmm3, xmm1
movdqa xmm4, xmm2
; begin epilog
- add rsp, 16
pop rdi
pop rsi
- RESTORE_GOT
+ pop rbx
UNSHADOW_ARGS
pop rbp
ret