diff options
| author |   Damjan Marion <damarion@cisco.com> | 2021-10-28 12:02:15 +0200 |
|---|---|---|
| committer |   Florin Coras <florin.coras@gmail.com> | 2021-10-28 15:54:25 +0000 |
| commit | e6709ff37dc0f3a58ed5ad98aace73fe801f1e9d (patch) | |
| tree | d71e12113f9eb31d789d059aa4073b07a44409fb /src/vnet/ip/ip_sas.h | |
| parent | 48c0534c2eafe23fe8efba8c913109f30f6a294c (diff) | |
ip: improve csum fold on x86_64
New code seems to be 1.5 clocks faster.
old:
mov eax,edi
shr rdi,0x20
add rdi,rax
movzx edx,di
shr rdi,0x10
add rdx,rdi
movzx eax,dx
shr rdx,0x10
add rax,rdx
mov rdx,rax
shr rdx,0x10
add eax,edx
new:
mov rax,rdi
shr rax,0x20
add eax,edi
mov edi,0x10
shrx edi,eax,edi
adc ax,di
adc ax,0x0
Type: improvement
Change-Id: I3c565812c67ff4c3db197a9d4137a6c131b5b66c
Signed-off-by: Damjan Marion <damarion@cisco.com>
Diffstat (limited to 'src/vnet/ip/ip_sas.h')
0 files changed, 0 insertions, 0 deletions