[turbofan] Change TruncateFloat32ToUint64 to TryTruncateFloat32ToUint64.

TryTruncateFloat32ToUint64 converts a float32 to a uint64. Additionally it
provides an optional second return value which indicates whether the conversion
succeeded (i.e. float32 value was within uint64 range) or not.

I implemented the new operator on x64, arm64, and mips64. @v8-ppc-ports, can you
please take care of the ppc64 implementation of the second output?

Additionally I fixed a bug on x64 and mips64 in the implementation of
TryTruncateFloat64ToUint64. Cases where the input value was between -1 and 0
were handled incorrectly.

R=titzer@chromium.org, v8-arm-ports@googlegroups.com, v8-mips-ports@googlegroups.com

Review URL: https://codereview.chromium.org/1512023002

Cr-Commit-Position: refs/heads/master@{#32796}
19 files changed
tree: f969f8589c3e29cd5698d21a4b3ebbbe129d73e6
  1. benchmarks/
  2. build/
  3. docs/
  4. include/
  5. infra/
  6. samples/
  7. src/
  8. test/
  9. testing/
  10. third_party/
  11. tools/
  12. .clang-format
  13. .gitignore
  14. .ycm_extra_conf.py
  15. AUTHORS
  16. BUILD.gn
  17. ChangeLog
  18. codereview.settings
  19. DEPS
  20. LICENSE
  21. LICENSE.strongtalk
  22. LICENSE.v8
  23. LICENSE.valgrind
  24. Makefile
  25. Makefile.android
  26. Makefile.nacl
  27. OWNERS
  28. PRESUBMIT.py
  29. README.md
  30. snapshot_toolchain.gni
  31. WATCHLISTS
README.md

V8 JavaScript Engine

V8 is Google's open source JavaScript engine.

V8 implements ECMAScript as specified in ECMA-262.

V8 is written in C++ and is used in Google Chrome, the open source browser from Google.

V8 can run standalone, or can be embedded into any C++ application.

V8 Project page: https://github.com/v8/v8/wiki

Getting the Code

Checkout depot tools, and run

    fetch v8

This will checkout V8 into the directory v8 and fetch all of its dependencies. To stay up to date, run

    git pull origin
    gclient sync

For fetching all branches, add the following into your remote configuration in .git/config:

    fetch = +refs/branch-heads/*:refs/remotes/branch-heads/*
    fetch = +refs/tags/*:refs/tags/*

Contributing

Please follow the instructions mentioned on the V8 wiki.