[Webkit-unassigned] [Bug 157938] New: Math.pow with Object arguments get deoptimized
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Thu May 19 21:49:35 PDT 2016
https://bugs.webkit.org/show_bug.cgi?id=157938
Bug ID: 157938
Summary: Math.pow with Object arguments get deoptimized
Classification: Unclassified
Product: WebKit
Version: WebKit Nightly Build
Hardware: Unspecified
OS: Unspecified
Status: NEW
Severity: Normal
Priority: P2
Component: JavaScriptCore
Assignee: webkit-unassigned at lists.webkit.org
Reporter: joepeck at webkit.org
CC: benjamin at webkit.org, fpizlo at apple.com,
ggaren at apple.com
* SUMMARY
Math.pow with Object arguments get deoptimized.
It seems the DFG doesn't reason about converting Object -> numbers via valueOf() here.
* TEST
var sum = 0;
for (var i = 0; i < 1e5; ++i) {
sum += Math.pow(2, {valueOf() { return 3 }});
}
* NOTES
$ jsc test.js -p profile.json
$ display-profiler-output profile.json
CodeBlock #Instr Source Counts Machine Counts #Compil Inlines #Exits Last Opts Source
Base/DFG/FTL/FTLOSR Base/DFG/FTL/FTLOSR Src/Total Get/Put/Call
valueOf#BI9kVc 8 462/10073/89433/0 462/10073/89433/0 3 0/0 0 0/0/0 function () { return 3 }
<global>#D7oSjt 267 99506/20/0/0 99506/20/0/0 4 0/0 20 1/5/1 var sum = 0; for (var i = 0; i < 1e5; ++i) { sum +
> log <global>#D7oSjt
Compilation <global>#D7oSjt-1-Baseline:
Total count: 3283261 Max count: 99506
Compilation <global>#D7oSjt-2-DFG:
Total count: 120 Max count: 5
EXIT: at bc#186 due to Uncountable, 5 times
Jettisoned due to BaselineLoopReoptimizationTrigger
Compilation <global>#D7oSjt-3-DFG:
Total count: 240 Max count: 10
EXIT: at bc#186 due to Uncountable, 10 times
Jettisoned due to BaselineLoopReoptimizationTrigger
Compilation <global>#D7oSjt-4-DFG:
Total count: 120 Max count: 5
EXIT: at bc#186 due to Uncountable, 5 times
> d <global>#D7oSjt-2-DFG
...
5 99486/20/0/0 94:< 5:loc12> NewObject(JS|UseAsOther, Final, %DY:Object, R:HeapObjectCount, W:HeapObjectCount, Exits, bc#99)
...
5 99486/20/0/0 238:<!0:-> InvalidationPoint(MustGen, W:SideState, Exits, bc#177, exit: bc#186)
5 99506/20/0/0 233:< 1:loc14> DoubleConstant(Double|PureInt, Bytecodedouble, Double: 4611686018427387904, 2.000000, bc#186)
5 99506/20/0/0 157:< 2:loc12> ArithPow(DoubleRep:@233<Double>, Check:Int32:@94, Double|UseAsOther, Bytecodedouble, Exits, bc#186)
5 99506/20/0/0 0x510434202461: mov $0x4000000000000000, %rax
5 99506/20/0/0 0x51043420246b: movq %rax, %xmm0
5 99506/20/0/0 0x510434202470: jmp 0x510434202725
!!!!! !!!!! EXIT: due to Uncountable, 5 times
--
You are receiving this mail because:
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.webkit.org/pipermail/webkit-unassigned/attachments/20160520/1c588aa5/attachment.html>
More information about the webkit-unassigned
mailing list