Revert "Reland "make SkJumper stages normal Skia code""

This reverts commit 78cb579f33943421afc8423a39867fcfd69fed44.

Reason for revert: lowp should be controlled by defined(JUMPER_IS_SCALAR), not defined(__clang__).  So close.

Original change's description:
> Reland "make SkJumper stages normal Skia code"
> 
> This is a reland of 22e536e3a1a09405d1c0e6f071717a726d86e8d4
> 
> Now with fixed #include paths in SkRasterPipeline_opts.h,
> and -ffp-contract=fast for the :hsw target to minimize
> diffs on non-Windows Clang AVX2/AVX-512 bots.
> 
> Original change's description:
> > make SkJumper stages normal Skia code
> >
> > Enough clients are using Clang now that we can say, use Clang to build
> > if you want these software pipeline stages to go fast.
> >
> > This lets us drop the offline build aspect of SkJumper stages, instead
> > building as part of Skia using the SkOpts framework.
> >
> > I think everything should work, except I've (temporarily) removed
> > AVX-512 support.  I will put this back in a follow up.
> >
> > I have had to drop Windows down to __vectorcall and our narrower
> > stage calling convention that keeps the d-registers on the stack.
> > I tried forcing sysv_abi, but that crashed Clang.  :/
> >
> > Added a TODO to up the same narrower stage calling convention
> > for lowp stages... we just *don't* today, for no good reason.
> >
> > Change-Id: Iaaa792ffe4deab3508d2dc5d0008c163c24b3383
> > Reviewed-on: https://skia-review.googlesource.com/110641
> > Commit-Queue: Mike Klein <mtklein@chromium.org>
> > Reviewed-by: Herb Derby <herb@google.com>
> > Reviewed-by: Florin Malita <fmalita@chromium.org>
> 
> Change-Id: I44f2c03d33958e3807747e40904b6351957dd448
> Reviewed-on: https://skia-review.googlesource.com/112742
> Reviewed-by: Mike Klein <mtklein@chromium.org>

TBR=mtklein@chromium.org,herb@google.com,fmalita@chromium.org

Change-Id: Ie64da98f5187d44e03c0ce05d7cb189d4a6e6663
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/112743
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>

1 files changed, 17 insertions, 3 deletions

diff --git a/gn/core.gni b/gn/core.gni
index 12a74ae93b..bcec7c02f0 100644
--- a/gn/core.gni
+++ b/gn/core.gni
@@ -440,8 +440,6 @@ skia_core_sources = [
   "$_include/core/SkUnPreMultiply.h",
   "$_include/core/SkVertices.h",
 
-  "$_src/jumper/SkJumper.cpp",
-
   # private
   "$_include/private/SkAtomics.h",
   "$_include/private/SkChecksum.h",
@@ -529,4 +527,20 @@ skia_core_sources = [
   "$_src/pathops/SkReduceOrder.h",
 ]
 
-skia_core_defines = []  #  Used to be used by Chromium, but no longer.
+skia_core_sources += [
+  "$_src/jumper/SkJumper.cpp",
+  "$_src/jumper/SkJumper_stages.cpp",
+  "$_src/jumper/SkJumper_stages_lowp.cpp",
+]
+skia_core_defines = []
+if (is_win) {
+  if (host_os == "win") {
+    skia_core_sources += [ "$_src/jumper/SkJumper_generated_win.S" ]
+  } else {
+    # TODO(thakis): Enable jumper in linux->win cross builds once the
+    # assembler situation is figured out, https://crbug.com/762167
+    skia_core_defines += [ "SK_JUMPER_USE_ASSEMBLY=0" ]
+  }
+} else if (target_cpu != "wasm") {
+  skia_core_sources += [ "$_src/jumper/SkJumper_generated.S" ]
+}