mirror of
https://github.com/Q3Rally-Team/rallyunlimited-engine.git
synced 2024-11-29 07:22:15 +00:00
119 lines
No EOL
2 KiB
NASM
119 lines
No EOL
2 KiB
NASM
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; this is mostly copy-pasted x86-version with x86_64-related fixes and comments
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; runs about 4x times faster than C version
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; saves about 3M ticks each second
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.code
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S_WriteLinearBlastStereo16_SSE_x64 PROC
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push rsi
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push rdi
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push rbx
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mov rsi, rcx ; snd_p
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mov rdi, rdx ; snd_out
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mov rbx, r8 ; snd_linear_count
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test ebx,ebx
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jz LExit
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mov ecx,esi ; try to align source memory to 64 bytes boundary
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and ecx,63
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jz LMain ; if already aligned - goto main loop
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and ecx,3
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jnz LTail ; if not dword-aligned - tail work & exit, should never happen though
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shr ecx,2 ; get dword count to align source data
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not ecx
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add ecx,17
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LClamp1:
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mov eax,[rsi]
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sar eax,8
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cmp eax,32767
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jg LClampHigh1
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cmp eax,-32768
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jnl LClampDone1
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mov eax,-32768
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jmp LClampDone1
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LClampHigh1:
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mov eax,32767
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LClampDone1:
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mov [rdi],ax
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add rsi,4
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add rdi,2
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dec ebx
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jz LExit ; check if nothing left during alignment
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dec ecx
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jnz LClamp1
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LMain:
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mov ecx,ebx
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shr ecx,4
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jz LTail ; not enough 64-byte blocks
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and ebx, 15 ; remainder for tail job
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LAgain:
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movq mm0, qword ptr [rsi+ 0]
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movq mm1, qword ptr [rsi+ 8]
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movq mm2, qword ptr [rsi+16]
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movq mm3, qword ptr [rsi+24]
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movq mm4, qword ptr [rsi+32]
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movq mm5, qword ptr [rsi+40]
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movq mm6, qword ptr [rsi+48]
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movq mm7, qword ptr [rsi+56]
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psrad mm0,8
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psrad mm1,8
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psrad mm2,8
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psrad mm3,8
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psrad mm4,8
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psrad mm5,8
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psrad mm6,8
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psrad mm7,8
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packssdw mm0, mm1
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packssdw mm2, mm3
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packssdw mm4, mm5
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packssdw mm6, mm7
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movntq qword ptr [rdi+ 0], mm0
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movntq qword ptr [rdi+ 8], mm2
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movntq qword ptr [rdi+16], mm4
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movntq qword ptr [rdi+24], mm6
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add rsi, 64
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add rdi, 32
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dec ecx
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jnz LAgain
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LTail:
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test ebx, ebx
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jz LEnd
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LClamp2:
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mov eax,[rsi]
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sar eax,8
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cmp eax,32767
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jg LClampHigh2
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cmp eax,-32768
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jnl LClampDone2
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mov eax,-32768
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jmp LClampDone2
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LClampHigh2:
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mov eax,32767
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LClampDone2:
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mov [rdi],ax
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add rsi,4
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add rdi,2
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dec ebx
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jnz LClamp2
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LEnd:
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sfence
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emms
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LExit:
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pop rbx
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pop rdi
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pop rsi
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ret
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S_WriteLinearBlastStereo16_SSE_x64 ENDP
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END |