Gautam Sewani wrote:
As I mentioned, I am using intrinsics. (Intel SSE 2 intrinsics in the
emmintrin.h file to be specific). I do not wish to transfer data
between x87 and xmm registers, but when I am moving a __m128d variable
(a data type for use with the SSE2 intrinsics), to a 2-element double
array (to perform some calculation on each double individually) and
gcc is using generating x87 FPU code for that. I do not want to use
the x87 FPU at all, because as you said, there is no way of moving
data between x87 and XMM registers without going through memory.
Therefore I want to know a method/compiler-switch etc which will cause
gcc to *not* generate x87 FPU code.
On Thu, Jun 5, 2008 at 3:11 AM, Tim Prince <TimothyPrince@xxxxxxxxxxxxx> wrote:
Gautam Sewani wrote:
elided on account of top posting
Some of what you say seems to imply you would use a union with an __m128d
and a 2 element double array; other seems to imply you should simply use
auto-vectorization. You still haven't shown a real example, which would
permit anyone to advise you.
