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igzip: add macros for shrx, shlx, and bzhi instructions on old architectures

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Signed-off-by: Roy Oursler <roy.j.oursler@intel.com>
Reviewed-by: Greg Tucker <greg.b.tucker@intel.com>
This commit is contained in:
Roy Oursler 2016-06-09 12:55:59 -07:00 committed by Greg Tucker
parent bbc886cf01
commit 7c91df5e50
1 changed files with 66 additions and 0 deletions
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66
igzip/stdmac.asm
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@ -205,3 +205,69 @@ ssc:
mov rbx, rax
ret
%endm
;; Implement BZHI instruction on older architectures
;; Clobbers rcx, unless rcx is %%index
%macro BZHI 4
%define %%dest %1
%define %%src %2
%define %%index %3
%define %%tmp1 %4
%ifdef USE_HSWNI
bzhi %%src, %%dest, %%index
%else
%ifnidn %%index, rcx
mov rcx, %%index
%endif
mov %%tmp1, 1
shl %%tmp1, cl
sub %%tmp1, 1
%ifnidn %%src, %%dest
mov %%dest, %%src
%endif
and %%dest, %%tmp1
%endif
%endm
;; Implement shrx instruction on older architectures
;; Clobbers rcx, unless rcx is %%index
%macro SHRX 3
%define %%dest %1
%define %%src %2
%define %%index %3
%ifdef USE_HSWNI
shrx %%dest, %%src, %%index
%else
%ifnidn %%src, %%dest
mov %%dest, %%src
%endif
%ifnidn %%index, rcx
mov rcx, %%index
%endif
shr %%dest, cl
%endif
%endm
;; Implement shlx instruction on older architectures
;; Clobbers rcx, unless rcx is %%index
%macro SHLX 3
%define %%dest %1
%define %%src %2
%define %%index %3
%ifdef USE_HSWNI
shlx %%dest, %%src, %%index
%else
%ifnidn %%src, %%dest
mov %%dest, %%src
%endif
%ifnidn %%index, rcx
mov rcx, %%index
%endif
shl %%dest, cl
%endif
%endm