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  1. 29 Mar, 2016 4 commits
    • jarin's avatar
      Linux perf integration with the new support for JIT. · 82e95f59
      jarin authored 
      Difference from --perf-basic-prof:
- correctly attributes samples when code space gets reused (when unused code object dies and a new code objects is allocated at the same place).
- outputs compiled machine code for instruction-level profile.

Just like --perf-basic-prof, the file writer is not synchronized (even worse, there is a per-isolate file handle), so we will run into trouble with multiple isolates. However, this patch is still an improvement on --perf-basic-prof, and it should be fine to replace ll-prof.

The patch also introduces experimental support for debug info, but it does not seem to be picked by the perf tool.

Usage:

You need the perf tool from Linux kernel >4.5. Then run:

$ perf record -k mono d8 --perf-prof <your JS file>
$ perf inject -j -i perf.data -o perf.data.jitted
$ perf report -i perf.data.jitted

Some explanations:
The "-k mono" switch from "perf record" tells the perf tool to use the monotonic clock for perf sample timestamping. The "perf inject -j" command injects the collected code events into the perf data file, writing the output into perf.data.jitted. The perf report command then creates the report.

Review URL: https://codereview.chromium.org/1809203007

Cr-Commit-Position: refs/heads/master@{#35091}
      82e95f59
    • bmeurer's avatar
      [turbofan] Introduce NumberFloor simplified operator. · 43216574
      bmeurer authored 
      The NumberFloor operator matches exactly the semantics of the Math.floor
builtin on Numbers. It uses hardware rounding instructions if available,
but provides a full fallback solution that is compatible with Math.floor.
The lowering is optimizable based on types if needed later, i.e. we
already optimize it for the case that the input is already an Integer
(in the EcmaScript sense, including NaN and -0), but we could add more
optimizations, like combining NumberFloor and NumberDivide in the
future, if necessary.

R=jarin@chromium.org
BUG=v8:2890,v8:4059
LOG=n

Review URL: https://codereview.chromium.org/1843533003

Cr-Commit-Position: refs/heads/master@{#35090}
      43216574
    • bmeurer's avatar
      [date] Properly handle timezones with non-ASCII characters. · 7b342a23
      bmeurer authored 
      The timezone part of the Date string representation might contain
non-ASCII characters depending on the exact platform configuration,
so we cannot safely assume that the whole date string is ASCII
encoded.

CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_chromium_rel_ng;tryserver.blink:linux_blink_rel
R=yangguo@chromium.org
BUG=chromium:581925
LOG=n

Review URL: https://codereview.chromium.org/1838063002

Cr-Commit-Position: refs/heads/master@{#35089}
      7b342a23
    • v8-autoroll's avatar
      Update V8 DEPS. · d22a7ed4
      v8-autoroll authored 
      Rolling v8/tools/clang to 51bba1037858028f42141689ed1b3b63a20f0b52

TBR=machenbach@chromium.org,vogelheim@chromium.org,hablich@chromium.org

Review URL: https://codereview.chromium.org/1838013003

Cr-Commit-Position: refs/heads/master@{#35088}
      d22a7ed4
  3. 28 Mar, 2016 7 commits
    • jyan's avatar
      S390: Impl Left/Right Logical/Arith Shift Pair · b7eb0cf9
      jyan authored 
      Implement Left/Right Logical/Arithmetic Shift Pair operations for s390

R=joransiu@ca.ibm.com, mbrandy@us.ibm.com, michael_dawson@ca.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1835973003

Cr-Commit-Position: refs/heads/master@{#35087}
      b7eb0cf9
    • littledan's avatar
      Remove RegExp.prototype.source getter compat workaround · 80803aa8
      littledan authored 
      The getter RegExp.prototype.source is specified in ES2015 to throw when
called on a non-RegExp instance, such as RegExp.prototype. We had previously
put in a compatibility workaround for all RegExp getters to make them
throw on access specifically with RegExp.prototype as the receiver; however,
we only have evidence that this is needed for properties other than source.
This patch removes the compatibility workaround for get RegExp.prototype.source
and gives it semantics precisely as per the ES2015 specification.

R=adamk
BUG=chromium:581577,v8:4827
LOG=Y

Review URL: https://codereview.chromium.org/1837843002

Cr-Commit-Position: refs/heads/master@{#35086}
      80803aa8
    • adamk's avatar
      String.prototype.{match,search} should do only one RegExp brand check · 0fdf3255
      adamk authored 
      Previously, they would check for Symbol.match/Symbol.search, and then
do another check for Symbol.match in the RegExp constructor. This patch
avoids the second one by skipping the RegExp constructor, as the spec does.

Review URL: https://codereview.chromium.org/1840723002

Cr-Commit-Position: refs/heads/master@{#35085}
      0fdf3255
    • jyan's avatar
      S390: Fix Register conflict in CEntryStub · d65c8cbf
      jyan authored 
      when needs_return_buffer == true and result_size() > 2, the 3rd return value
is placed in r4 register. But when debug code is emited, it uses r4 register
for checking exceptions, which corrupts the 3rd return value.

R=joransiu@ca.ibm.com, mbrandy@us.ibm.com, michael_dawson@ca.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1839663002

Cr-Commit-Position: refs/heads/master@{#35084}
      d65c8cbf
    • bmeurer's avatar
      [builtins] Provide Math.floor as TurboFan builtin. · 36ead519
      bmeurer authored 
      This way we avoid the second deoptimization for the Math.floor and
Math.ceil builtins when -0 is involved. We still deoptimize the inlined
Crankshaft version in various cases, that's a separate issue.

The algorithm used for implement CodeStubAssembler::Float64Floor is
vaguely based on the fast math version used in the libm of various BSDs,
but had to be reengineered to match the EcmaScript specification.

R=epertoso@chromium.org
BUG=v8:2890, v8:4059
LOG=n

Review URL: https://codereview.chromium.org/1828253002

Cr-Commit-Position: refs/heads/master@{#35083}
      36ead519
    • bryleun's avatar
      S390: Fixed s390 simulation check for underflow in subtraction. · 0d24a0fc
      bryleun authored 
      Clang optimizes away CheckOverflowForIntSub at any opt
level (includes -O1, -O2, -O3) into a false statement,
resulting in incorrect values being returned. As the C++
standard considers overflows to be undefined behaviour,
this is technically correct as compilers can assume that
overflows never occur, but problematic in our case (where
overflows do occur, and a specific result is expected).

This change replaces the original check with a call to a
function that is optimized in a manner that returns correct output.

R=michael_dawson@ca.ibm.com,jyan@ca.ibm.com,mtbrandyberry@ca.ibm.com,joransiu@ca.ibm.com,danno@chromium.org,jkummerow@chromium.org,jochen@chromium.org

BUG=

Review URL: https://codereview.chromium.org/1826043002

Cr-Commit-Position: refs/heads/master@{#35082}
      0d24a0fc
    • caitpotter88's avatar
      [esnext] handle elements in FastObjectValuesOrEntries() · f5b85cb7
      caitpotter88 authored 
      Add support for optimizing objects with elements, which do not invoke JS and
cannot change the shape of the Object.

BUG=v8:4663
LOG=N

Review URL: https://codereview.chromium.org/1767113004

Cr-Commit-Position: refs/heads/master@{#35081}
      f5b85cb7
  5. 27 Mar, 2016 1 commit
  7. 26 Mar, 2016 3 commits
  9. 25 Mar, 2016 8 commits
  11. 24 Mar, 2016 17 commits