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Reading from WC is awfully slow as each access is uncached and so
performed synchronously, stalling for the memory load. x86 did introduce
some new instructions in SSE 4.1 to provide a small internal buffer to
accelerate reading back a cacheline at a time from uncached memory, for
this purpose.
v2: Don't be lazy and handle misalignment.
v3: Switch out of sse41 before emitting the generic memcpy routine
v4: Replace opencoded memcpy_from_wc
v5: Always flush the internal buffer before use (Eric)
v6: Assume bulk moves, so check for dst alignment.
v7: Use _mm_fence for _buitlin_ia32_mfence for consistency, remove
superfluous defines (Ville)
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Eric Anholt <eric@anholt.net>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
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The meson build avoids the failure by excluding the igt_x86.c file from
the compilation. autotools being what they are don't support that in an
easy way, so just use the preprocessor to avoid the duplicate function
definitions.
Since igt_x86.c will now be ignored for non-x86 builds, the meson work-
around can be removed.
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
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Just stub out the features return value, and return an empty string.
Signed-off-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Petri Latvala <petri.latvala@intel.com>
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Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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