MS does a very poor job, I know most of our SSE is asm'ed _____
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of David Spilling Sent: Tuesday, July 29, 2008 9:11 AM To: OpenSceneGraph Users Subject: Re: [osg-users] Using SSE within OSG Benjamin, may I suggest that you check the assembler code that the compilers create when compiling the OSG code? ... g++ with -march=core2 -O3 (see man page for description of parameters) the compiler automatically uses SSE I don't have much recent Linux/gcc experience, but can certainly attest that the MS compilers don't do a good job of spotting SSE vectorisation possibilities, even when you tell them to optimise with them (and this is from reading the generated ssembler). In MS you can insert SSE intrinsics , which still allow the compiler to optimise the execution order and memory/register usage e.g. based on cycle counts. I understand (from other sources) that the Intel vectorising compilers are much better at this, naturally. Perhaps this is then all only aMS/Windows thing? David
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