diff options
Diffstat (limited to 'src/asm/snapvector.asm')
| -rw-r--r-- | src/asm/snapvector.asm | 27 |
1 files changed, 15 insertions, 12 deletions
diff --git a/src/asm/snapvector.asm b/src/asm/snapvector.asm index acfb7930..a953778a 100644 --- a/src/asm/snapvector.asm +++ b/src/asm/snapvector.asm @@ -48,14 +48,15 @@ IFDEF idx64 stmxcsr [rsp] ; save SSE control word ldmxcsr ssecw ; set to round nearest - push rdi - mov rdi, rcx ; maskmovdqu uses rdi as implicit memory operand - movaps xmm1, ssemask ; initialize the mask register for maskmovdqu - movups xmm0, [rdi] ; here is stored our vector. Read 4 values in one go + movaps xmm1, ssemask ; initialize the mask register + movups xmm0, [rcx] ; here is stored our vector. Read 4 values in one go + movaps xmm2, xmm0 ; keep a copy of the original data + andps xmm0, xmm1 ; set the fourth value to zero in xmm0 + andnps xmm1, xmm2 ; copy fourth value to xmm1 and set rest to zero cvtps2dq xmm0, xmm0 ; convert 4 single fp to int cvtdq2ps xmm0, xmm0 ; convert 4 int to single fp - maskmovdqu xmm0, xmm1 ; write 3 values back to memory - pop rdi + orps xmm0, xmm1 ; combine all 4 values again + movups [rcx], xmm0 ; write 3 rounded and 1 unchanged values back to memory ldmxcsr [rsp] ; restore sse control word to old value add rsp, 8 @@ -69,14 +70,16 @@ ELSE stmxcsr [esp] ; save SSE control word ldmxcsr ssecw ; set to round nearest - push edi - mov edi, dword ptr 16[esp] ; maskmovdqu uses edi as implicit memory operand - movaps xmm1, ssemask ; initialize the mask register for maskmovdqu - movups xmm0, [edi] ; here is stored our vector. Read 4 values in one go + mov eax, dword ptr 16[esp] ; store address of vector in eax + movaps xmm1, ssemask ; initialize the mask register for maskmovdqu + movups xmm0, [eax] ; here is stored our vector. Read 4 values in one go + movaps xmm2, xmm0 ; keep a copy of the original data + andps xmm0, xmm1 ; set the fourth value to zero in xmm0 + andnps xmm1, xmm2 ; copy fourth value to xmm1 and set rest to zero cvtps2dq xmm0, xmm0 ; convert 4 single fp to int cvtdq2ps xmm0, xmm0 ; convert 4 int to single fp - maskmovdqu xmm0, xmm1 ; write 3 values back to memory - pop edi + orps xmm0, xmm1 ; combine all 4 values again + movups [eax], xmm0 ; write 3 rounded and 1 unchanged values back to memory ldmxcsr [esp] ; restore sse control word to old value add esp, 8 |