This change or-ifies the last low-hanging rules in generic. Again,
this is limited at short and repetitive rules, where the use or ors
does not impact readability.
Ran rulegen, no change in the actual compiler code.
Change-Id: I972b523bc08532f173a3645b47d6936b6e1218c8
Reviewed-on: https://go-review.googlesource.com/96335
Reviewed-by: Giovanni Bajo <rasky@develer.com>
For now, limited to the most repetitive rules that are also short and
simple, so that we can have a substantial conciseness win without
compromising rules readability.
Ran rulegen, no changes in the rewrite files.
Change-Id: I8447784895a218c5c1b4dfa1cdb355bd73dabfd1
Reviewed-on: https://go-review.googlesource.com/95955
Reviewed-by: Giovanni Bajo <rasky@develer.com>
While tinkering with different block orders for the preemptible
loop experiment, crashed the register allocator with a "bad"
one (these exist). Realized that one knob was controlling
two things (register allocation and branch patterns) and
decided that life would be simpler if the two orders were
independent.
Ran some experiments and determined that we have probably,
mostly, been optimizing for register allocation effects, not
branch effects. Bad block orders for register allocation are
somewhat costly.
This will also allow separate experimentation with perhaps-
better block orders for register allocation.
Change-Id: I6ecf2f24cca178b6f8acc0d3c4caaef043c11ed9
Reviewed-on: https://go-review.googlesource.com/47314
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Enabled when the tool runs with DEBUG_MEMORY_USAGE=1 env var.
After reporting the usage, it waits until user enters input
(helpful when checking top or other memory monitor)
Also adds net/http/pprof to export debug endpoints.
From the trace included in #21870
$ DEBUG_MEMORY_USAGE=1 go tool trace trace.out
2018/02/21 16:04:49 Parsing trace...
after parsing trace
Alloc: 3385747848 Bytes
Sys: 3661654648 Bytes
HeapReleased: 0 Bytes
HeapSys: 3488907264 Bytes
HeapInUse: 3426377728 Bytes
HeapAlloc: 3385747848 Bytes
Enter to continue...
2018/02/21 16:05:09 Serializing trace...
after generating trace
Alloc: 4908929616 Bytes
Sys: 5319063640 Bytes
HeapReleased: 0 Bytes
HeapSys: 5032411136 Bytes
HeapInUse: 4982865920 Bytes
HeapAlloc: 4908929616 Bytes
Enter to continue...
2018/02/21 16:05:18 Splitting trace...
after spliting trace
Alloc: 4909026200 Bytes
Sys: 5319063640 Bytes
HeapReleased: 0 Bytes
HeapSys: 5032411136 Bytes
HeapInUse: 4983046144 Bytes
HeapAlloc: 4909026200 Bytes
Enter to continue...
2018/02/21 16:05:39 Opening browser. Trace viewer is listening on http://127.0.0.1:33661
after httpJsonTrace
Alloc: 5288336048 Bytes
Sys: 7790245896 Bytes
HeapReleased: 0 Bytes
HeapSys: 7381123072 Bytes
HeapInUse: 5324120064 Bytes
HeapAlloc: 5288336048 Bytes
Enter to continue...
Change-Id: I88bb3cb1af3cb62e4643a8cbafd5823672b2e464
Reviewed-on: https://go-review.googlesource.com/92355
Reviewed-by: Peter Weinberger <pjw@google.com>
The existing code was somewhat convoluted and made several assumptions
about the encoding of position bases:
1) The position's base for a file contained a position whose base
pointed to itself (which is true but an implementation detail
of src.Pos).
2) Updating the position base for a line directive required finding
the base of the most recent's base position.
This change simply stores the file's position base and keeps using it
directly for each line directive (instead of getting it from the most
recently updated base).
Change-Id: I4d80da513bededb636eab0ce53257fda73f0dbc0
Reviewed-on: https://go-review.googlesource.com/95736
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Currently, bulkBarrierPreWrite uses inheap to decide whether the
destination is in the heap or whether to check for stack or global
data. However, this isn't the best question to ask.
Instead, get the span directly and query its state. This lets us
directly determine whether this might be a global, or is stack memory,
or is heap memory.
At this point, inheap is no longer used in the hot path, so drop it
from the must-be-inlined list and substitute spanOf.
This will help in a circuitous way with #23862, since fixing that is
going to push inheap very slightly over the inline-able threshold on a
few platforms.
Change-Id: I5360fc1181183598502409f12979899e1e4d45f7
Reviewed-on: https://go-review.googlesource.com/95495
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>
The task-oriented trace view presents the execution trace organized
based on goroutines. Often, which P a goroutine was running on is
useful, so this CL includes the P ids in the goroutine execution slices.
R=go1.11
Change-Id: I96539bf8215e5c1cd8cc997a90204f57347c48c8
Reviewed-on: https://go-review.googlesource.com/90221
Reviewed-by: Heschi Kreinick <heschi@google.com>
The GC time for a task is defined by the sum of GC duration
overlapping with the task's duration.
Also, grey out non-overlapping slices in the task-oriented
trace view.
R=go1.11
Change-Id: I42def0eb520f5d9bd07edd265e558706f6fab552
Reviewed-on: https://go-review.googlesource.com/90219
Reviewed-by: Heschi Kreinick <heschi@google.com>
Reuse even more memory, and keep track of it in a long-lived debugState
object rather than piecemeal in the Cache.
Change-Id: Ib6936b4e8594dc6dda1f59ece753c00fd1c136ba
Reviewed-on: https://go-review.googlesource.com/92404
Reviewed-by: David Chase <drchase@google.com>
Change the closures to methods on debugState, mostly just for aesthetic
reasons.
Change-Id: I5242807f7300efafc7efb4eb3bd305ac3ec8e826
Reviewed-on: https://go-review.googlesource.com/92403
Reviewed-by: David Chase <drchase@google.com>
changedVars was functionally a set, but couldn't be iterated over
efficiently. In functions with many variables, the wasted iteration was
costly. Use a sparseSet instead.
(*gc.Node).String() is very expensive: it calls Sprintf, which does
reflection, etc, etc. Instead, just look at .Sym.Name, which is all we
care about.
Change-Id: Ib61cd7b5c796e1813b8859135e85da5bfe2ac686
Reviewed-on: https://go-review.googlesource.com/92402
Reviewed-by: David Chase <drchase@google.com>
Replace the OnStack boolean in VarLoc with a flag bit in StackOffset.
This doesn't get much memory savings since it's still 64-bit aligned,
but does seem to help a bit anyway.
Change liveSlot to fit into 16 bytes. Because nested structs still get
padding, this required inlining it. Fortunately there's not much logic
to copy.
Change-Id: Ie19a409daa41aa310275c4517a021eecf8886441
Reviewed-on: https://go-review.googlesource.com/92401
Reviewed-by: David Chase <drchase@google.com>
For now, limited to the most repetitive rules that are also short and
simple, so that we can have a substantial conciseness win without
compromising rules readability.
Ran rulegen, no changes in the rewrite files.
Change-Id: I8d8cc67d02faca4756cc02402b763f1645ee31de
Reviewed-on: https://go-review.googlesource.com/95935
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
For now, limited to the most repetitive rules that are also short and
simple, so that we can have a substantial conciseness win without
compromising rules readability.
Ran rulegen, no change in the actual compiler code (as expected).
Change-Id: Ia74acc389cd8310eb7fe8f927171fa3d292d2a86
Reviewed-on: https://go-review.googlesource.com/95797
Reviewed-by: Giovanni Bajo <rasky@develer.com>
For now, limited to the most repetitive rules that are also short and
simple, so that we can have a substantial conciseness win without
compromising rules readability.
Ran rulegen, no change in the actual compiler code (as expected).
Change-Id: Ib0bfbbc181fcec095fb78ac752addd1eee0c3575
Reviewed-on: https://go-review.googlesource.com/95796
Reviewed-by: Giovanni Bajo <rasky@develer.com>
No changes in the generated file, as expected.
Change-Id: I30e0404612cd150f1455378b8db1c18b1e12d34e
Reviewed-on: https://go-review.googlesource.com/95616
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
We did warn on them in some cases, but not others. In particular, if one
used a slice composite literal with struct pointer elements, and omitted
the type of an element's composite literal, it would not get any warning
even if it should get one.
The issue is that typ.Underlying() can be of type *types.Pointer. Skip
those levels of indirection before checking for a *types.Struct
underlying type.
isLocalType also needed a bit of tweaking to ignore dereferences.
Perhaps that can be rewritten now that we have type info, but let's
leave it for another time.
Fixes#23539.
Change-Id: I727a497284df1325b70d47a756519f5db1add25d
Reviewed-on: https://go-review.googlesource.com/89715
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Sometimes, multiple CLs being merged that create rules on the same
opcodes can cause the generated file to differ compared to a new
regeneration. This is caused by the fact that rulegen splits
generated functions in chunks of 10 rules per function (to avoid
creating functions that are too big). If two CLs add rules to
the same function, they might cause a generated function to
have more than 10 rules, even though each CL individually didn't
pass this limit.
Change-Id: Ib641396b7e9028f80ec8718746969d390a9fbba9
Reviewed-on: https://go-review.googlesource.com/95795
Run-TryBot: Giovanni Bajo <rasky@develer.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
For now, limited to the most repetitive rules that are also short and
simple, so that we can have a substantial conciseness win without
compromising rules readability.
Ran rulegen, no change in the actual compiler code (as expected).
Change-Id: Ib1d2b9fbc787379105ec9baf10d2c1e2ff3c4c5c
Reviewed-on: https://go-review.googlesource.com/95615
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
For functions with many local variables, keeping track of every
LocalSlot for every variable is very expensive. Only track the slots
that are actually used by a given variable.
Change-Id: Iaafbce030a782b8b8c4a0eb7cf025e59af899ea4
Reviewed-on: https://go-review.googlesource.com/92400
Reviewed-by: David Chase <drchase@google.com>
Keeping the start state of each block around costs more than just
recomputing them as necessary, especially because many blocks only have
one predecessor and don't need any merging at all. Stop storing the
start state, and reuse predecessors' end states as much as conveniently
possible.
Change-Id: I549bad9e1a35af76a974e46fe69f74cd4dce873b
Reviewed-on: https://go-review.googlesource.com/92399
Reviewed-by: David Chase <drchase@google.com>
This saves an instruction and a register. The new rules
match ~4900 times during all.bash.
Change-Id: I2f867c5e70262004e31f545f3bb89e939c45b718
Reviewed-on: https://go-review.googlesource.com/94767
Reviewed-by: Keith Randall <khr@golang.org>
For now, limited to the most repetitive rules that are also short and
simple, so that we can have a substantial conciseness win without
compromising rules readability.
Ran rulegen, no change in the actual compiler code (as expected).
Change-Id: Ibf157382fb4544c063fbc80406fb9302430728fe
Reviewed-on: https://go-review.googlesource.com/95595
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
For now, limited to a few repetitive boolean rules where the win is
substantial (4+ variants).
Change-Id: I67bce0d356ca7d71a0f15ff98551fe2caff8abf9
Reviewed-on: https://go-review.googlesource.com/95535
Run-TryBot: Alberto Donizetti <alb.donizetti@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This adds the ability to add a #x:y anchor to the trace view URL that
causes the viewer to initially select from x ms to y ms.
Change-Id: I4a980d8128ecc85dbe41f224e8ae336707a4eaab
Reviewed-on: https://go-review.googlesource.com/60794
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
In addition to look nicer to the eye, this allows to reformat
and indent rules without causing spurious changes to the generated
file, making it easier to spot functional changes.
After this CL, all CLs that will aggregate rules through
the new "|" functionality should cause no changes to the
generated files.
Change-Id: Icec283585ba8d7b91c79d76513c1d83dca4b30aa
Reviewed-on: https://go-review.googlesource.com/95216
Run-TryBot: Giovanni Bajo <rasky@develer.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Replace some ints with bool and use arrays istead of slices where
possible.
Change-Id: I510bdaec48f9c437685e72c4a3291cffeb7ef5fc
Reviewed-on: https://go-review.googlesource.com/83859
Run-TryBot: Ilya Tocar <ilya.tocar@intel.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
When we go from a branch block to a plain block, reset the
branch prediction bit. Downstream passes asssume that if the
branch prediction is set, then the block has 2 successors.
Fixes#23504
Change-Id: I2898ec002228b2e34fe80ce420c6939201c0a5aa
Reviewed-on: https://go-review.googlesource.com/88955
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Instead of
(And64 x x) -> x
(And32 x x) -> x
(And16 x x) -> x
(And8 x x) -> x
we can now do:
(And(64|32|16|8) x x) -> x
Any part of an opcode can have a parenthesized, |-separated list of possibilites.
The rule is then expanded using each piece of the | combo.
If there are multiple | clauses, they get expanded in tandem.
(All the first positions, then all the second positions, etc.)
All places | opcodes appear must have the same count.
A more complicated example:
(MOV(L|SS)load [off1] {sym1} (LEAQ4 [off2] {sym2} ptr idx) mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
(MOV(L|SS)loadidx4 [off1+off2] {mergeSym(sym1,sym2)} ptr idx mem)
This meta-rule generates 2 rules, a MOVL and a MOVSS rule.
This CL is carefully orchestrated to not change the generated rules file at all.
In some cases, this means we can't align the rules nicely because it changes
the whitespace in the generated code. I'll clean that up as a separate step.
There are many more opportunites to compactify rules using this new mechanism.
I've just done some examples, there's more to do.
Change-Id: I8a5e748cd0761ccbb12d09b01925b2f1f4b2f608
Reviewed-on: https://go-review.googlesource.com/86595
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Updated docs that go run does not return the exit code of
the compiled binary.
Fixes#23716
Change-Id: Ib85459974c4c6d2760ddba957ef711628098661f
Reviewed-on: https://go-review.googlesource.com/94795
Reviewed-by: Ian Lance Taylor <iant@golang.org>
One of the variables declared in cleantempnopop named 'kill'
does not hold a OVARKILL node but an OVARLIVE node.
Rename that variable to 'live' to differentiate it from the other
variable named kill that holds a OVARKILL node.
Passes toolstash -cmp.
Change-Id: I34c8729e5c303b8cdabe44c9af980d4f16000e4b
Reviewed-on: https://go-review.googlesource.com/88816
Run-TryBot: Martin Möhrmann <moehrmann@google.com>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Rename all map implementation and test files to use "map"
as a file name prefix instead of "hashmap" for the implementation
and "map" for the test file names.
Change-Id: I7b317c1f7a660b95c6d1f1a185866f2839e69446
Reviewed-on: https://go-review.googlesource.com/90336
Run-TryBot: Martin Möhrmann <moehrmann@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Fixes#23867, CVE-2018-7187
Change-Id: I5d0ba4923c9ed354ef76290e149c182447f9dfe2
Reviewed-on: https://go-review.googlesource.com/94656
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Alberto Donizetti
Ben Shi
erifan01
David Chase
Hana Kim
Robert Griesemer
Austin Clements
Heschi Kreinick
Giovanni Bajo
Daniel Martí
Shawn Smith
Ilya Tocar
Ryuma Yoshida
philhofer
Keith Randall
Keith Randall
Kunpei Sakai
Yury Smolsky
Martin Möhrmann
Ian Lance Taylor
Arthur Khashaev