PPC/s390: [turbofan] Further optimize DataView accesses.

Port 5fecd146bfbea6edd3a92d52f61462b7455e8f3c

Original Commit Message:

    This adds support for unaligned load/store access to the DataView
    backing store and uses byteswap operations to fix up the endianess
    when necessary. This changes the Word32ReverseBytes operator to be
    a required operator and adds the missing support on the Intel and
    ARM platforms (on 64-bit platforms the Word64ReverseBytes operator
    is also mandatory now).

    This further improves the performance on the dataviewperf.js test
    mentioned in the tracking bug by up to 40%, and at the same time
    reduces the code complexity in the EffectControlLinearizer.

R=bmeurer@chromium.org, joransiu@ca.ibm.com, michael_dawson@ca.ibm.com

Change-Id: Ia9aad21713a2ad76ce3ef2b816fc20e9a27fe4c9
Reviewed-on: https://chromium-review.googlesource.com/1174936
Reviewed-by: John Barboza <jbarboza@ca.ibm.com>
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#55132}
5 files changed
tree: afb8528df910682a4cf79ced3c72194dd3567be6
  1. .clang-format
  2. .editorconfig
  3. .git-blame-ignore-revs
  4. .gitattributes
  5. .gitignore
  6. .gn
  7. .vpython
  8. .ycm_extra_conf.py
  10. BUILD.gn
  12. ChangeLog
  13. DEPS
  15. LICENSE.fdlibm
  16. LICENSE.strongtalk
  17. LICENSE.v8
  18. LICENSE.valgrind
  19. OWNERS
  20. PRESUBMIT.py
  21. README.md
  23. benchmarks/
  24. build_overrides/
  25. codereview.settings
  26. custom_deps/
  27. docs/
  28. gni/
  29. include/
  30. infra/
  31. samples/
  32. snapshot_toolchain.gni
  33. src/
  34. test/
  35. testing/
  36. third_party/
  37. tools/

V8 JavaScript Engine

V8 is Google's open source JavaScript engine.

V8 implements ECMAScript as specified in ECMA-262.

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