commit 613ad38b10b66159009baf7f2ccde974645a02f1
author Mike Klein <mtklein@google.com> Thu Jun 06 11:42:02 2019 -0500
committer Skia Commit-Bot <skia-commit-bot@chromium.org> Tue Jun 11 18:40:39 2019 +0000
tree 8be41d95bd83bfd5a227965001984ddab3c7c458
parent cc5dc0182446a318f56539c2f18d866dd9b7325d

add basic JIT using xbyak

Long term we'll need to spin up our own codegen rather than using xbyak,
since it uses exceptions and does not support ARM.

I really don't like how I've hacked in the caching of the JITted
program, but that'll change anyway when switching away from xbyak.

Performance looks good, better than (lowp) SkRasterPipeline
but not quite as good as hand-tuned code:

  Opts:     0.2 ns/px
  RP:       0.7
  F32:      0.8
  I32:      0.6
  I32_SWAR: 0.5

ninja -C out dm nanobench && out/dm -m SkVM && gobjdump -D -b binary -mi386:x86-64 /tmp/code.bin --insn-width=10

Change-Id: I34ce46e1d3fe5aa75f42709049a92ac79bf48bbd
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/219341
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>

BUILD.gn

diff --git a/BUILD.gn b/BUILD.gn
index f8453fe..a8e617d 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -37,6 +37,7 @@
   skia_use_metal = false
   skia_use_libheif = is_skia_dev_build
   skia_use_x11 = is_linux
+  skia_use_xbyak = false
   skia_use_xps = true
 
   skia_android_serial = ""
@@ -817,6 +818,15 @@
   ]
 }
 
+optional("skvm_jit") {
+  enabled = skia_use_xbyak
+  public_defines = [ "SKVM_JIT" ]
+
+  public_deps = [
+    "//third_party/xbyak",
+  ]
+}
+
 if (skia_enable_gpu && skia_generate_workarounds) {
   action("workaround_list") {
     script = "tools/build_workaround_header.py"
@@ -875,6 +885,7 @@
     ":none",
     ":png",
     ":raw",
+    ":skvm_jit",
     ":sse2",
     ":sse41",
     ":sse42",