From 7f690fafad5013d1f21fd434a4b4f2482128b97c Mon Sep 17 00:00:00 2001 From: Siddhesh Poyarekar Date: Wed, 13 Dec 2017 18:50:27 +0530 Subject: [PATCH] aarch64: Improve strcmp unaligned performance Replace the simple byte-wise compare in the misaligned case with a dword compare with page boundary checks in place. For simplicity I've chosen a 4K page boundary so that we don't have to query the actual page size on the system. This results in up to 3x improvement in performance in the unaligned case on falkor and about 2.5x improvement on mustang as measured using bench-strcmp. * sysdeps/aarch64/strcmp.S (misaligned8): Compare dword at a time whenever possible. (cherry picked from commit 2bce01ebbaf8db52ba4a5635eb5744f989cdbf69) --- ChangeLog | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/ChangeLog b/ChangeLog index 20d98f08226..436aee29eab 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,8 @@ +2019-09-06 Siddhesh Poyarekar + + * sysdeps/aarch64/strcmp.S (misaligned8): Compare dword at a + time whenever possible. + 2019-09-06 Siddhesh Poyarekar * sysdeps/aarch64/memcmp.S: Widen comparison to 16 bytes at a -- 2.47.2