This is part of a general effort to shrink walk.
In an ideal world, we'd have an SSA op for allocation,
but we don't yet have a good mechanism for introducing
function calling during SSA compilation.
In the meantime, SSA conversion is a better place for it.
This also makes it easier to introduce new optimizations;
instead of doing the typecheck walk dance,
we can simply write what we want the backend to do.
I introduced a new opcode in this change because:
(a) It avoids a class of bugs involving correctly detecting
whether this ONEW is a "before walk" ONEW or an "after walk" ONEW.
It also means that using ONEW or ONEWOBJ in the wrong context
will generally result in a faster failure.
(b) Opcodes are cheap.
(c) It provides a better place to put documentation.
This change also is also marginally more performant:
name old alloc/op new alloc/op delta
Template 39.1MB ± 0% 39.0MB ± 0% -0.14% (p=0.008 n=5+5)
Unicode 28.4MB ± 0% 28.4MB ± 0% ~ (p=0.421 n=5+5)
GoTypes 132MB ± 0% 132MB ± 0% -0.23% (p=0.008 n=5+5)
Compiler 608MB ± 0% 607MB ± 0% -0.25% (p=0.008 n=5+5)
SSA 2.04GB ± 0% 2.04GB ± 0% -0.01% (p=0.008 n=5+5)
Flate 24.4MB ± 0% 24.3MB ± 0% -0.13% (p=0.008 n=5+5)
GoParser 29.3MB ± 0% 29.1MB ± 0% -0.54% (p=0.008 n=5+5)
Reflect 84.8MB ± 0% 84.7MB ± 0% -0.21% (p=0.008 n=5+5)
Tar 36.7MB ± 0% 36.6MB ± 0% -0.10% (p=0.008 n=5+5)
XML 48.7MB ± 0% 48.6MB ± 0% -0.24% (p=0.008 n=5+5)
[Geo mean] 85.0MB 84.8MB -0.19%
name old allocs/op new allocs/op delta
Template 383k ± 0% 382k ± 0% -0.26% (p=0.008 n=5+5)
Unicode 341k ± 0% 341k ± 0% ~ (p=0.579 n=5+5)
GoTypes 1.37M ± 0% 1.36M ± 0% -0.39% (p=0.008 n=5+5)
Compiler 5.59M ± 0% 5.56M ± 0% -0.49% (p=0.008 n=5+5)
SSA 16.9M ± 0% 16.9M ± 0% -0.03% (p=0.008 n=5+5)
Flate 238k ± 0% 238k ± 0% -0.23% (p=0.008 n=5+5)
GoParser 306k ± 0% 303k ± 0% -0.93% (p=0.008 n=5+5)
Reflect 990k ± 0% 987k ± 0% -0.33% (p=0.008 n=5+5)
Tar 356k ± 0% 355k ± 0% -0.20% (p=0.008 n=5+5)
XML 444k ± 0% 442k ± 0% -0.45% (p=0.008 n=5+5)
[Geo mean] 848k 845k -0.33%
Change-Id: I2c36003a7cbf71b53857b7de734852b698f49310
Reviewed-on: https://go-review.googlesource.com/c/go/+/167957
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
This change does a bulk rename of several identifiers in the compiler.
See #27167 and https://docs.google.com/document/d/19_ExiylD9MRfeAjKIfEsMU1_RGhuxB9sA0b5Zv7byVI/
for context and for discussion of these particular renames.
Commands run to generate this change:
gorename -from '"cmd/compile/internal/gc".OPROC' -to OGO
gorename -from '"cmd/compile/internal/gc".OCOM' -to OBITNOT
gorename -from '"cmd/compile/internal/gc".OMINUS' -to ONEG
gorename -from '"cmd/compile/internal/gc".OIND' -to ODEREF
gorename -from '"cmd/compile/internal/gc".OARRAYBYTESTR' -to OBYTES2STR
gorename -from '"cmd/compile/internal/gc".OARRAYBYTESTRTMP' -to OBYTES2STRTMP
gorename -from '"cmd/compile/internal/gc".OARRAYRUNESTR' -to ORUNES2STR
gorename -from '"cmd/compile/internal/gc".OSTRARRAYBYTE' -to OSTR2BYTES
gorename -from '"cmd/compile/internal/gc".OSTRARRAYBYTETMP' -to OSTR2BYTESTMP
gorename -from '"cmd/compile/internal/gc".OSTRARRAYRUNE' -to OSTR2RUNES
gorename -from '"cmd/compile/internal/gc".Etop' -to ctxStmt
gorename -from '"cmd/compile/internal/gc".Erv' -to ctxExpr
gorename -from '"cmd/compile/internal/gc".Ecall' -to ctxCallee
gorename -from '"cmd/compile/internal/gc".Efnstruct' -to ctxMultiOK
gorename -from '"cmd/compile/internal/gc".Easgn' -to ctxAssign
gorename -from '"cmd/compile/internal/gc".Ecomplit' -to ctxCompLit
Not altered: parameters and local variables (mostly in typecheck.go) named top,
which should probably now be called ctx (and which should probably have a named type).
Also not altered: Field called Top in gc.Func.
gorename -from '"cmd/compile/internal/gc".Node.Isddd' -to IsDDD
gorename -from '"cmd/compile/internal/gc".Node.SetIsddd' -to SetIsDDD
gorename -from '"cmd/compile/internal/gc".nodeIsddd' -to nodeIsDDD
gorename -from '"cmd/compile/internal/types".Field.Isddd' -to IsDDD
gorename -from '"cmd/compile/internal/types".Field.SetIsddd' -to SetIsDDD
gorename -from '"cmd/compile/internal/types".fieldIsddd' -to fieldIsDDD
Not altered: function gc.hasddd, params and local variables called isddd
Also not altered: fmt.go prints nodes using "isddd(%v)".
cd cmd/compile/internal/gc; go generate
I then manually found impacted comments using exact string match
and fixed them up by hand. The comment changes were trivial.
Passes toolstash-check.
Fixes#27167. If this experiment is deemed a success,
we will open a new tracking issue for renames to do
at the end of the 1.13 cycles.
Change-Id: I2dc541533d2ab0d06cb3d31d65df205ecfb151e8
Reviewed-on: https://go-review.googlesource.com/c/150140
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Only return a pointer p to the new slices backing array from makeslice.
Makeslice callers then construct sliceheader{p, len, cap} explictly
instead of makeslice returning the slice.
Reduces go binary size by ~0.2%.
Removes 92 (~3.5%) panicindex calls from go binary.
Change-Id: I29b7c3b5fe8b9dcec96e2c43730575071cfe8a94
Reviewed-on: https://go-review.googlesource.com/c/141822
Run-TryBot: Martin Möhrmann <moehrmann@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
The previous CL introduced stack objects. This CL removes the old
ambiguously live liveness analysis. After this CL we're relying
on stack objects exclusively.
Update a bunch of liveness tests to reflect the new world.
Fixes#22350
Change-Id: I739b26e015882231011ce6bc1a7f426049e59f31
Reviewed-on: https://go-review.googlesource.com/c/134156
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
The tool has gotten better over time, so re-generating the files brings
some advantages like fewer objects, dropping the use of fmt, and
dropping unnecessary bounds checks.
While at it, add the missing go:generate line for obj.AddrType.
Change-Id: I120c9795ee8faddf5961ff0384b9dcaf58d831ff
Reviewed-on: https://go-review.googlesource.com/100015
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Now possible, since stringer just got the -trimprefix flag added.
While at it, simplify a few Op stringifications since we can now use %v,
and no longer have to worry about o<len(opnames).
Passes toolstash -cmp on std cmd.
Fixes#15462.
Change-Id: Icdcde0b0a5eb165d18488918175024da274f782b
Reviewed-on: https://go-review.googlesource.com/76790
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Dave Cheney <dave@cheney.net>
