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John Stiles 8f440b4e1e Optimize away no-op arithmetic in ConstantFolder. 
Expressions like `x * 1`, `x *= 1`, `x + 0`, `x * 0`, or `0 / x` don't
actually do anything, and can be simplified to just `x` or `0`. (The
zero case must also check that `x` doesn't have side effects, because
`0 * myFunction()` still needs to call `myFunction`.)

`0 - x` is also detected and rewritten as `-x`.
`0 / 0` is left as-is.

This logic works for scalars and vectors; matrices are left as-is.

A similar optimization also occurs in the constant-propagation pass, so
we see almost no diffs in the tests. If control-flow analysis is turned
off, we do see some improvements. (I didn't reuse the existing code at
all, since it was designed around rewriting the CFG tree, but the
concept was identical.)

Change-Id: Ia99cd81f1d4cd3dafaa43ccac6a2261e3257a185
Bug: skia:11343
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/380356
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
2021-03-06 01:33:35 +00:00
animations first cut at a checkbox 2009-10-21 19:41:10 +00:00
bazel bazel baby steps 2020-09-14 15:18:32 +00:00
bench Reland "rename GrSDFTOptions to GrSDFTControl" 2021-03-05 15:24:35 +00:00
bin pull arm64 binary on arm64 Mac/Linux 2021-01-15 19:00:46 +00:00
build/fuchsia [fuchsia] Fix fidlc command. 2020-06-10 03:29:24 +00:00
build_overrides Port to ANGLE's GN files 2020-09-11 15:22:34 +00:00
client_utils/android Replace 'typedef xxxxx INHERITED' with 'using INHERITED = xxxx;'. 2020-09-03 03:41:26 +00:00
demos.skia.org Clean up prev experiment. 2021-03-05 15:56:14 +00:00
dm Reland "Support sharing promise images between DDLs" 2021-03-04 13:10:37 +00:00
docker [infra] Fix index.d.ts copy in Wasm Docker build 2021-02-23 15:54:11 +00:00
docs/examples Guard legacy matrixtransforms, and expose new one 2021-02-01 22:10:39 +00:00
example Reland "Remove use of legacy display globals." 2020-10-05 19:13:58 +00:00
experimental Made SkSL DSL into public API 2021-03-04 21:03:58 +00:00
fuzz Bail if context creation fails in FuzzDDLThreadingGL 2021-03-04 03:50:26 +00:00
gm Reland "Use analytic AA in FillRRectOp even if the target has MSAA" 2021-03-05 23:57:15 +00:00
gn Optimize ternary tests that check a const variable. 2021-03-05 21:41:05 +00:00
include DSL var values are now specified at construction time rather than in 2021-03-05 21:47:28 +00:00
infra update FM service account 2021-03-03 20:01:39 +00:00
modules SkShaper_coretext correct dependencies. 2021-03-05 22:06:25 +00:00
platform_tools [SkottieView] call onAnimationEnd listeners after finished repeating 2021-03-02 15:35:03 +00:00
resources Improve optimization of prefix expressions at IR time. 2021-03-05 21:41:55 +00:00
samplecode Make GrGLSLFragmentProcessors be created as std::unique_ptr. 2021-02-23 19:31:01 +00:00
site update release notes 2021-02-26 22:02:24 +00:00
specs Fix CanvasKit generated documentation to work with emscripten 1.39.16. 2020-05-27 12:23:32 +00:00
src Optimize away no-op arithmetic in ConstantFolder. 2021-03-06 01:33:35 +00:00
tests Optimize away no-op arithmetic in ConstantFolder. 2021-03-06 01:33:35 +00:00
third_party Roll skcms from 4a4ff5bbefdf to 4e5402c56973 (3 revisions) 2021-02-24 07:02:54 +00:00
tools Add Viewer checkbox to toggle Control-Flow Analysis. 2021-03-05 22:00:14 +00:00
.bazelignore bazel baby steps 2020-09-14 15:18:32 +00:00
.clang-format no more bin packing in .clang-format 2021-03-04 17:22:50 +00:00
.clang-tidy Disable ClangTidy namespace comments for short blocks. 2020-08-24 14:01:22 +00:00
.gitignore Update gitignore for goma win_toolchain 2021-02-01 17:25:52 +00:00
.gn Pre-emptive fix for upcoming ANGLE change. 2021-01-08 17:23:52 +00:00
AUTHORS Add UWP support 2021-02-10 19:04:42 +00:00
BUILD.bazel bazel baby steps 2020-09-14 15:18:32 +00:00
BUILD.gn Activate FuzzDDLThreading 2021-02-25 21:26:07 +00:00
codereview.settings Make uploading to Gerrit the default for Skia 2016-11-09 19:07:56 +00:00
CONTRIBUTING Fix references to https://sites.google.com/site/skiadocs/. 2015-02-03 13:12:54 -02:00
CQ_COMMITTERS Moved committer list to chrome-infra-auth and deleted it from the repo 2015-09-02 13:37:54 -07:00
DEPS Roll Dawn from 637d947937b7 to 95034f6528d4 (8 revisions) 2021-03-05 07:10:54 +00:00
DIR_METADATA Move metadata in OWNERS files to DIR_METADATA files 2021-02-02 23:41:54 +00:00
go.mod [infra] Roll infra dependency 2021-02-25 19:56:00 +00:00
go.sum [infra] Roll infra dependency 2021-02-25 19:56:00 +00:00
LICENSE LICENSE file: clean up 2019-11-22 21:59:03 +00:00
PRESUBMIT.py Reland "[infra] Switch from isolate to RBE-CAS" 2021-02-22 14:41:06 +00:00
public.bzl Support building GrGLInterface factory functions for both EGL and GLX. 2021-02-23 16:37:48 +00:00
README Fix references to https://sites.google.com/site/skiadocs/. 2015-02-03 13:12:54 -02:00
README.chromium Update README.chromium. 2015-06-11 13:19:24 -07:00
RELEASE_NOTES.txt Made SkSL DSL into public API 2021-03-04 21:03:58 +00:00
whitespace.txt Whitespace change to re-trigger Mac/iOS tests 2020-02-23 20:55:01 +00:00
WORKSPACE.bazel bazel baby steps 2020-09-14 15:18:32 +00:00

README 

Skia is a complete 2D graphic library for drawing Text, Geometries, and Images.

See full details, and build instructions, at https://skia.org.