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| author | Andre Przywara <andre.przywara@amd.com> | 2009-10-23 13:44:31 +0200 |
|---|---|---|
| committer | Aurelien Jarno <aurelien@aurel32.net> | 2009-10-23 17:10:36 +0200 |
| commit | 31501a714b7a99fd7b937a45558ed02aa1b57d58 (patch) | |
| tree | ff6ad928f74dd654a02770cd90a799ae8d17a83e /cpu-exec.c | |
| parent | cb2dbfc3516f3fc6b49c52c759b2023d5a824b52 (diff) | |
target-i386: implement lzcnt emulation
lzcnt is a AMD Phenom/Barcelona added instruction returning the
number of leading zero bits in a word.
As this is similar to the "bsr" instruction, reuse the existing
code. There need to be some more changes, though, as lzcnt always
returns a valid value (in opposite to bsr, which has a special
case when the operand is 0).
lzcnt is guarded by the ABM CPUID bit (Fn8000_0001:ECX_5).
Signed-off-by: Andre Przywara <andre.przywara@amd.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Diffstat (limited to 'cpu-exec.c')
0 files changed, 0 insertions, 0 deletions