New mem_zero_detect function will fail on avx only machines.
Change-Id: I3bca49bff886f9c130c89e8c74b31110e9bac76b
Signed-off-by: Greg Tucker <greg.b.tucker@intel.com>
micro-optimizations: vpcmpeqb+vpmaskmov is faster than vptest according
to uops.info; make usually untaken branches target forward.
reduce numbers of data dependant branches and code size.
Change-Id: Ie70b4bc99685368e5131f23344348bfaf7c27d3e
Signed-off-by: Nicola Torracca <shark@bitchx.it>
To support Intel CET, all indirect branch targets must start with
ENDBR32/ENDBR64. Here is a patch to define endbranch and add it to
function entries in x86 assembly codes which are indirect branch
targets as discovered by running testsuite on Intel CET machine and
visual inspection.
Verified with
$ CC="gcc -Wl,-z,cet-report=error -fcf-protection" CXX="g++ -Wl,-z,cet-report=error -fcf-protection" .../configure x86_64-linux
$ make -j8
$ make -j8 check
with both nasm and yasm on both CET and non-CET machines.
Change-Id: I9822578e7294fb5043a64ab7de5c41de81a7d337
Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
Previously windows build could only use yasm because some procedural items such
as proc_start were not supported by nasm. This adds a few macros and fixes so
nasm can be used to build on windows.
Change-Id: Ia05dc3ff482f33b0f915bb1be3c7df5e4a753b3a
Signed-off-by: Greg Tucker <greg.b.tucker@intel.com>
This patch introduces the base, avx and sse optimized zero detect memory function.
The zero detect memory function tests if a memory region is all zeroes. If all the
bytes in the memory region are zero, the function return a zero. Otherwise, if the
memory region has non zero bytes, the zero detect function returns a 1.
Change-Id: If965badf750377124d0067d09f888d0419554998
Signed-off-by: John Kariuki <John.K.Kariuki@intel.com>
