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Set default rounding mode to FE_NEAREST again. Thanks to Matthias Bentrup for providing some explanations.

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This commit is contained in:
Thilo Schulz 2011-09-27 14:43:20 +00:00
parent ebec84c55d
commit 8a500d71da
6 changed files with 34 additions and 59 deletions
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20
code/asm/snapvector.asm
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@ -45,9 +45,6 @@ IFDEF idx64
qsnapvectorsse PROC
sub rsp, 8
stmxcsr [rsp] ; save SSE control word
ldmxcsr ssecw ; set to round nearest
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
@ -57,20 +54,13 @@ IFDEF idx64
cvtdq2ps xmm0, xmm0 ; convert 4 int to single fp
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
ret
qsnapvectorsse ENDP
ELSE
qsnapvectorsse PROC
sub esp, 8
stmxcsr [esp] ; save SSE control word
ldmxcsr ssecw ; set to round nearest
mov eax, dword ptr 12[esp] ; store address of vector in eax
mov eax, dword ptr 4[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
@ -80,9 +70,6 @@ ELSE
cvtdq2ps xmm0, xmm0 ; convert 4 int to single fp
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
ret
qsnapvectorsse ENDP
@ -95,14 +82,9 @@ ELSE
qsnapvectorx87 PROC
mov eax, dword ptr 4[esp]
sub esp, 2
fnstcw word ptr [esp]
fldcw fpucw
qroundx87 [eax]
qroundx87 4[eax]
qroundx87 8[eax]
fldcw [esp]
add esp, 2
ret
qsnapvectorx87 ENDP