skia /
skia /
57b0b09dfdb6f01c43b76cd56e8477ab30230ab0 handle any N in aarch64 JIT code
Add a tail loop to handle elements one at a time.
Just like in the interpreter, the only instructions
that need to be changed are the loads and stores,
16 byte -> 4 byte and 4 byte -> 1 byte.
With this we can mark the interpreter as SkUNREACHABLE,
and it even completely compiles away, saving a few KB.
Example profile for the SkVMTool float-squaring program
running N=15 over and over:
Samples│
│ skvm-jit-3663518994():
42 │40: cmp x0, #0x4
│44: ↓ b.lt 60
51 │48: ldr q0, [x1]
197 │4c: mul v0.4s, v0.4s, v0.4s
135 │50: str q0, [x1]
│54: add x1, x1, #0x10
43 │58: sub x0, x0, #0x4
│5c: b.al 40
150 │60: ↓ cbz x0, 7c
67 │64: ldr s0, [x1]
130 │68: mul v0.4s, v0.4s, v0.4s
135 │6c: str s0, [x1]
18 │70: add x1, x1, #0x4
17 │74: sub x0, x0, #0x1
20 │78: b.al 60
124 │7c: ← ret
Change-Id: I153d7bc247942366a686e30a9cad60c935f754ed
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/227138
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Herb Derby <herb@google.com>
1 file changed
