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cmd/compile: port callnew to ssa conversion
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 commit is contained in:
Josh Bleecher Snyder
parent
fd270d8b57
commit
23b476a3c8
@ -295,6 +295,7 @@ var (
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growslice,
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msanread,
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msanwrite,
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newobject,
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newproc,
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panicdivide,
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panicshift,
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@ -312,7 +313,8 @@ var (
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typedmemclr,
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typedmemmove,
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Udiv,
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writeBarrier *obj.LSym
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writeBarrier,
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zerobaseSym *obj.LSym
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BoundsCheckFunc [ssa.BoundsKindCount]*obj.LSym
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ExtendCheckFunc [ssa.BoundsKindCount]*obj.LSym
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@ -4,9 +4,9 @@ package gc
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import "strconv"
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const _Op_name = "XXXNAMENONAMETYPEPACKLITERALADDSUBORXORADDSTRADDRANDANDAPPENDBYTES2STRBYTES2STRTMPRUNES2STRSTR2BYTESSTR2BYTESTMPSTR2RUNESASAS2AS2FUNCAS2RECVAS2MAPRAS2DOTTYPEASOPCALLCALLFUNCCALLMETHCALLINTERCALLPARTCAPCLOSECLOSURECOMPLITMAPLITSTRUCTLITARRAYLITSLICELITPTRLITCONVCONVIFACECONVNOPCOPYDCLDCLFUNCDCLFIELDDCLCONSTDCLTYPEDELETEDOTDOTPTRDOTMETHDOTINTERXDOTDOTTYPEDOTTYPE2EQNELTLEGEGTDEREFINDEXINDEXMAPKEYSTRUCTKEYLENMAKEMAKECHANMAKEMAPMAKESLICEMULDIVMODLSHRSHANDANDNOTNEWNOTBITNOTPLUSNEGORORPANICPRINTPRINTNPARENSENDSLICESLICEARRSLICESTRSLICE3SLICE3ARRSLICEHEADERRECOVERRECVRUNESTRSELRECVSELRECV2IOTAREALIMAGCOMPLEXALIGNOFOFFSETOFSIZEOFBLOCKBREAKCASEXCASECONTINUEDEFEREMPTYFALLFORFORUNTILGOTOIFLABELGORANGERETURNSELECTSWITCHTYPESWTCHANTMAPTSTRUCTTINTERTFUNCTARRAYDDDDDDARGINLCALLEFACEITABIDATASPTRCLOSUREVARCFUNCCHECKNILVARDEFVARKILLVARLIVEINDREGSPINLMARKRETJMPGETGEND"
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const _Op_name = "XXXNAMENONAMETYPEPACKLITERALADDSUBORXORADDSTRADDRANDANDAPPENDBYTES2STRBYTES2STRTMPRUNES2STRSTR2BYTESSTR2BYTESTMPSTR2RUNESASAS2AS2FUNCAS2RECVAS2MAPRAS2DOTTYPEASOPCALLCALLFUNCCALLMETHCALLINTERCALLPARTCAPCLOSECLOSURECOMPLITMAPLITSTRUCTLITARRAYLITSLICELITPTRLITCONVCONVIFACECONVNOPCOPYDCLDCLFUNCDCLFIELDDCLCONSTDCLTYPEDELETEDOTDOTPTRDOTMETHDOTINTERXDOTDOTTYPEDOTTYPE2EQNELTLEGEGTDEREFINDEXINDEXMAPKEYSTRUCTKEYLENMAKEMAKECHANMAKEMAPMAKESLICEMULDIVMODLSHRSHANDANDNOTNEWNEWOBJNOTBITNOTPLUSNEGORORPANICPRINTPRINTNPARENSENDSLICESLICEARRSLICESTRSLICE3SLICE3ARRSLICEHEADERRECOVERRECVRUNESTRSELRECVSELRECV2IOTAREALIMAGCOMPLEXALIGNOFOFFSETOFSIZEOFBLOCKBREAKCASEXCASECONTINUEDEFEREMPTYFALLFORFORUNTILGOTOIFLABELGORANGERETURNSELECTSWITCHTYPESWTCHANTMAPTSTRUCTTINTERTFUNCTARRAYDDDDDDARGINLCALLEFACEITABIDATASPTRCLOSUREVARCFUNCCHECKNILVARDEFVARKILLVARLIVEINDREGSPINLMARKRETJMPGETGEND"
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var _Op_index = [...]uint16{0, 3, 7, 13, 17, 21, 28, 31, 34, 36, 39, 45, 49, 55, 61, 70, 82, 91, 100, 112, 121, 123, 126, 133, 140, 147, 157, 161, 165, 173, 181, 190, 198, 201, 206, 213, 220, 226, 235, 243, 251, 257, 261, 270, 277, 281, 284, 291, 299, 307, 314, 320, 323, 329, 336, 344, 348, 355, 363, 365, 367, 369, 371, 373, 375, 380, 385, 393, 396, 405, 408, 412, 420, 427, 436, 439, 442, 445, 448, 451, 454, 460, 463, 466, 472, 476, 479, 483, 488, 493, 499, 504, 508, 513, 521, 529, 535, 544, 555, 562, 566, 573, 580, 588, 592, 596, 600, 607, 614, 622, 628, 633, 638, 642, 647, 655, 660, 665, 669, 672, 680, 684, 686, 691, 693, 698, 704, 710, 716, 722, 727, 731, 738, 744, 749, 755, 758, 764, 771, 776, 780, 785, 789, 799, 804, 812, 818, 825, 832, 840, 847, 853, 857, 860}
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var _Op_index = [...]uint16{0, 3, 7, 13, 17, 21, 28, 31, 34, 36, 39, 45, 49, 55, 61, 70, 82, 91, 100, 112, 121, 123, 126, 133, 140, 147, 157, 161, 165, 173, 181, 190, 198, 201, 206, 213, 220, 226, 235, 243, 251, 257, 261, 270, 277, 281, 284, 291, 299, 307, 314, 320, 323, 329, 336, 344, 348, 355, 363, 365, 367, 369, 371, 373, 375, 380, 385, 393, 396, 405, 408, 412, 420, 427, 436, 439, 442, 445, 448, 451, 454, 460, 463, 469, 472, 478, 482, 485, 489, 494, 499, 505, 510, 514, 519, 527, 535, 541, 550, 561, 568, 572, 579, 586, 594, 598, 602, 606, 613, 620, 628, 634, 639, 644, 648, 653, 661, 666, 671, 675, 678, 686, 690, 692, 697, 699, 704, 710, 716, 722, 728, 733, 737, 744, 750, 755, 761, 764, 770, 777, 782, 786, 791, 795, 805, 810, 818, 824, 831, 838, 846, 853, 859, 863, 866}
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func (i Op) String() string {
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if i >= Op(len(_Op_index)-1) {
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@ -76,6 +76,7 @@ func initssaconfig() {
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growslice = sysfunc("growslice")
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msanread = sysfunc("msanread")
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msanwrite = sysfunc("msanwrite")
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newobject = sysfunc("newobject")
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newproc = sysfunc("newproc")
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panicdivide = sysfunc("panicdivide")
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panicdottypeE = sysfunc("panicdottypeE")
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@ -94,6 +95,8 @@ func initssaconfig() {
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typedmemmove = sysfunc("typedmemmove")
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Udiv = sysvar("udiv") // asm func with special ABI
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writeBarrier = sysvar("writeBarrier") // struct { bool; ... }
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zerobaseSym = sysvar("zerobase")
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if thearch.LinkArch.Family == sys.Wasm {
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BoundsCheckFunc[ssa.BoundsIndex] = sysvar("goPanicIndex")
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BoundsCheckFunc[ssa.BoundsIndexU] = sysvar("goPanicIndexU")
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@ -2453,6 +2456,14 @@ func (s *state) expr(n *Node) *ssa.Value {
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}
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return s.zeroVal(n.Type)
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case ONEWOBJ:
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if n.Type.Elem().Size() == 0 {
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return s.newValue1A(ssa.OpAddr, n.Type, zerobaseSym, s.sb)
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}
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typ := s.expr(n.Left)
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vv := s.rtcall(newobject, true, []*types.Type{n.Type}, typ)
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return vv[0]
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default:
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s.Fatalf("unhandled expr %v", n.Op)
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return nil
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@ -668,7 +668,8 @@ const (
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ORSH // Left >> Right
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OAND // Left & Right
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OANDNOT // Left &^ Right
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ONEW // new(Left)
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ONEW // new(Left); corresponds to calls to new in source code
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ONEWOBJ // runtime.newobject(n.Type); introduced by walk; Left is type descriptor
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ONOT // !Left
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OBITNOT // ^Left
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OPLUS // +Left
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@ -481,7 +481,7 @@ opswitch:
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Dump("walk", n)
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Fatalf("walkexpr: switch 1 unknown op %+S", n)
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case ONONAME, OINDREGSP, OEMPTY, OGETG:
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case ONONAME, OINDREGSP, OEMPTY, OGETG, ONEWOBJ:
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case OTYPE, ONAME, OLITERAL:
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// TODO(mdempsky): Just return n; see discussion on CL 38655.
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@ -1944,21 +1944,11 @@ func callnew(t *types.Type) *Node {
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yyerror("%v is go:notinheap; heap allocation disallowed", t)
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}
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dowidth(t)
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if t.Size() == 0 {
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// Return &runtime.zerobase if we know that the requested size is 0.
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// This is what runtime.mallocgc would return.
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z := newname(Runtimepkg.Lookup("zerobase"))
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z.SetClass(PEXTERN)
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z.Type = t
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return typecheck(nod(OADDR, z, nil), ctxExpr)
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}
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fn := syslook("newobject")
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fn = substArgTypes(fn, t)
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v := mkcall1(fn, types.NewPtr(t), nil, typename(t))
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v.SetNonNil(true)
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return v
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n := nod(ONEWOBJ, typename(t), nil)
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n.Type = types.NewPtr(t)
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n.SetTypecheck(1)
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n.SetNonNil(true)
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return n
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}
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// isReflectHeaderDataField reports whether l is an expression p.Data
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