ref: ad4d1c4383b7705157807f2c364fca3ee3d713ef
parent: 8a52189f0dfc18ccfa7a17f0e5d97ca4434806f1
author: Martin Storsjö <martin@martin.st>
date: Fri Feb 1 08:22:58 EST 2019
arm64: looprestoration: Optimize loop termination checks in copy_narrow_neon
--- a/src/arm/64/looprestoration.S
+++ b/src/arm/64/looprestoration.S
@@ -498,9 +498,8 @@
add x7, x0, x1
lsl x1, x1, #1
18:
- cmp w4, #8
- b.lt 110f
subs w4, w4, #8
+ b.lt 110f
ld1 {v0.8b}, [x2], #8 st1 {v0.b}[0], [x0], x1 st1 {v0.b}[1], [x7], x1@@ -513,6 +512,7 @@
b.le 0f
b 18b
110:
+ add w4, w4, #8
asr x1, x1, #1
11:
subs w4, w4, #1
@@ -526,9 +526,8 @@
add x7, x0, x1
lsl x1, x1, #1
24:
- cmp w4, #4
- b.lt 210f
subs w4, w4, #4
+ b.lt 210f
ld1 {v0.4h}, [x2], #8 st1 {v0.h}[0], [x0], x1 st1 {v0.h}[1], [x7], x1@@ -537,6 +536,7 @@
b.le 0f
b 24b
210:
+ add w4, w4, #4
asr x1, x1, #1
22:
subs w4, w4, #1
@@ -561,9 +561,8 @@
add x7, x0, x1
lsl x1, x1, #1
42:
- cmp w4, #2
- b.lt 41f
subs w4, w4, #2
+ b.lt 41f
ld1 {v0.2s}, [x2], #8 st1 {v0.s}[0], [x0], x1 st1 {v0.s}[1], [x7], x1