Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

Restore copyMatchTry4 #207

Merged
merged 1 commit into from
Jun 14, 2023
Merged

Restore copyMatchTry4 #207

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Jump to
Jump to file
Failed to load files.
Diff view
Diff view
15 changes: 13 additions & 2 deletions internal/lz4block/decode_arm64.s
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -185,7 +185,7 @@ copyMatchTry8:
// A 16-at-a-time loop doesn't provide a further speedup.
CMP $8, len
CCMP HS, offset, $8, $0
BLO copyMatchLoop1
BLO copyMatchTry4

AND $7, len, lenRem
SUB $8, len
Expand All @@ -201,8 +201,19 @@ copyMatchLoop8:
MOVD tmp2, -8(dst)
B copyMatchDone

copyMatchTry4:
// Copy words if both len and offset are at least four.
CMP $4, len
CCMP HS, offset, $4, $0
BLO copyMatchLoop1

MOVWU.P 4(match), tmp2
MOVWU.P tmp2, 4(dst)
SUBS $4, len
BEQ copyMatchDone

copyMatchLoop1:
// Byte-at-a-time copy for small offsets.
// Byte-at-a-time copy for small offsets <= 3.
MOVBU.P 1(match), tmp2
MOVB.P tmp2, 1(dst)
SUBS $1, len
Expand Down