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To run on ancient CPUs, we compile for Windows with -arch:SSE since
8bd6bf93b7711a7ac7c5cbd7c3bb980481570ebd (August 2014). Thus
_M_IX86_FP gets defined as 1. This meant that LO_SSE2_AVAILABLE did
not get defined, and that we hardcoded tools::cpuid::hasSSE2() as
always returning false. That was hardly the intent.
Change-Id: I7ee34510a774dab865c8990b74b91a5284218a96
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Change-Id: Iee60389ccc9e348db6ed00e48e32b1e86f17b530
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Prereq. to enable runtime SSE2 detection is that the compiler
supports it in the first place. MSVS and GCC use different
compiler flags for this so use __LO_SSE2_AVAILABLE__ to make this
build platform independent.
emmintrin.h is unavailable on ARM Android so include this and
compile the SSE2 specific code only when we are sure we can build
SSE2 code (__LO_SSE2_AVAILABLE__ is defined).
Change-Id: I212c4e0b99a314d087b9def822a81325b25f3469
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For corner case CPUs out there that support SSE and not SSE2 it
makes more sense to use the "fallback" code path instead of
writing a SSE only version. For this reason detecting SSE is not
relevant anymore - so removing it.
Change-Id: I3f1425af2cb5cdf9fba699e2996014598a15b5c1
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Change-Id: I29330061e2986ec2ae899c2f3a63d0eadd9cc194
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