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cmd/compile: reduce overhead of RParams in types.Type

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Changed RParams in types.Type to be a pointer to a slice, rather than a
slice itself, in order to reduce it from three words to one words, since
the large majority of types will not be generic or instantiated from a
generic type.

Additional cleanup: remove operation OTYPEINST, which we don't have need
of, since all type instantiations are either handled by types2 or happen
automatically during some form of stenciling.

Both of these are useful cleanups before the Go 1.17 freeze.

Change-Id: I61ad56b3c698b30d2cb5a2cdd12263202c54f49c
Reviewed-on: https://go-review.googlesource.com/c/go/+/308770
Run-TryBot: Dan Scales <danscales@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
Trust: Dan Scales <danscales@google.com>
This commit is contained in:
Dan Scales 2021-04-08 13:02:21 -07:00
parent 4d7d7a4c50
commit 519f223aa2
4 changed files with 41 additions and 40 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
src/cmd/compile/internal/ir/node.go
View File

@ -285,7 +285,6 @@ const (
// Left is nil if there is no type-switch variable
OTYPESW
OFUNCINST // instantiation of a generic function
OTYPEINST // instantiation of a generic type
// types
OTCHAN // chan int

51
src/cmd/compile/internal/ir/op_string.go
View File

@ -138,35 +138,34 @@ func _() {
_ = x[OSWITCH-127]
_ = x[OTYPESW-128]
_ = x[OFUNCINST-129]
_ = x[OTYPEINST-130]
_ = x[OTCHAN-131]
_ = x[OTMAP-132]
_ = x[OTSTRUCT-133]
_ = x[OTINTER-134]
_ = x[OTFUNC-135]
_ = x[OTARRAY-136]
_ = x[OTSLICE-137]
_ = x[OINLCALL-138]
_ = x[OEFACE-139]
_ = x[OITAB-140]
_ = x[OIDATA-141]
_ = x[OSPTR-142]
_ = x[OCFUNC-143]
_ = x[OCHECKNIL-144]
_ = x[OVARDEF-145]
_ = x[OVARKILL-146]
_ = x[OVARLIVE-147]
_ = x[ORESULT-148]
_ = x[OINLMARK-149]
_ = x[OLINKSYMOFFSET-150]
_ = x[OTAILCALL-151]
_ = x[OGETG-152]
_ = x[OEND-153]
_ = x[OTCHAN-130]
_ = x[OTMAP-131]
_ = x[OTSTRUCT-132]
_ = x[OTINTER-133]
_ = x[OTFUNC-134]
_ = x[OTARRAY-135]
_ = x[OTSLICE-136]
_ = x[OINLCALL-137]
_ = x[OEFACE-138]
_ = x[OITAB-139]
_ = x[OIDATA-140]
_ = x[OSPTR-141]
_ = x[OCFUNC-142]
_ = x[OCHECKNIL-143]
_ = x[OVARDEF-144]
_ = x[OVARKILL-145]
_ = x[OVARLIVE-146]
_ = x[ORESULT-147]
_ = x[OINLMARK-148]
_ = x[OLINKSYMOFFSET-149]
_ = x[OTAILCALL-150]
_ = x[OGETG-151]
_ = x[OEND-152]
}
const _Op_name = "XXXNAMENONAMETYPEPACKLITERALNILADDSUBORXORADDSTRADDRANDANDAPPENDBYTES2STRBYTES2STRTMPRUNES2STRSTR2BYTESSTR2BYTESTMPSTR2RUNESASAS2AS2DOTTYPEAS2FUNCAS2MAPRAS2RECVASOPCALLCALLFUNCCALLMETHCALLINTERCALLPARTCAPCLOSECLOSURECOMPLITMAPLITSTRUCTLITARRAYLITSLICELITPTRLITCONVCONVIFACECONVNOPCOPYDCLDCLFUNCDCLCONSTDCLTYPEDELETEDOTDOTPTRDOTMETHDOTINTERXDOTDOTTYPEDOTTYPE2EQNELTLEGEGTDEREFINDEXINDEXMAPKEYSTRUCTKEYLENMAKEMAKECHANMAKEMAPMAKESLICEMAKESLICECOPYMULDIVMODLSHRSHANDANDNOTNEWNOTBITNOTPLUSNEGORORPANICPRINTPRINTNPARENSENDSLICESLICEARRSLICESTRSLICE3SLICE3ARRSLICEHEADERRECOVERRECVRUNESTRSELRECV2IOTAREALIMAGCOMPLEXALIGNOFOFFSETOFSIZEOFMETHEXPRSTMTEXPRBLOCKBREAKCASECONTINUEDEFERFALLFORFORUNTILGOTOIFLABELGORANGERETURNSELECTSWITCHTYPESWFUNCINSTTYPEINSTTCHANTMAPTSTRUCTTINTERTFUNCTARRAYTSLICEINLCALLEFACEITABIDATASPTRCFUNCCHECKNILVARDEFVARKILLVARLIVERESULTINLMARKLINKSYMOFFSETTAILCALLGETGEND"
const _Op_name = "XXXNAMENONAMETYPEPACKLITERALNILADDSUBORXORADDSTRADDRANDANDAPPENDBYTES2STRBYTES2STRTMPRUNES2STRSTR2BYTESSTR2BYTESTMPSTR2RUNESASAS2AS2DOTTYPEAS2FUNCAS2MAPRAS2RECVASOPCALLCALLFUNCCALLMETHCALLINTERCALLPARTCAPCLOSECLOSURECOMPLITMAPLITSTRUCTLITARRAYLITSLICELITPTRLITCONVCONVIFACECONVNOPCOPYDCLDCLFUNCDCLCONSTDCLTYPEDELETEDOTDOTPTRDOTMETHDOTINTERXDOTDOTTYPEDOTTYPE2EQNELTLEGEGTDEREFINDEXINDEXMAPKEYSTRUCTKEYLENMAKEMAKECHANMAKEMAPMAKESLICEMAKESLICECOPYMULDIVMODLSHRSHANDANDNOTNEWNOTBITNOTPLUSNEGORORPANICPRINTPRINTNPARENSENDSLICESLICEARRSLICESTRSLICE3SLICE3ARRSLICEHEADERRECOVERRECVRUNESTRSELRECV2IOTAREALIMAGCOMPLEXALIGNOFOFFSETOFSIZEOFMETHEXPRSTMTEXPRBLOCKBREAKCASECONTINUEDEFERFALLFORFORUNTILGOTOIFLABELGORANGERETURNSELECTSWITCHTYPESWFUNCINSTTCHANTMAPTSTRUCTTINTERTFUNCTARRAYTSLICEINLCALLEFACEITABIDATASPTRCFUNCCHECKNILVARDEFVARKILLVARLIVERESULTINLMARKLINKSYMOFFSETTAILCALLGETGEND"
var _Op_index = [...]uint16{0, 3, 7, 13, 17, 21, 28, 31, 34, 37, 39, 42, 48, 52, 58, 64, 73, 85, 94, 103, 115, 124, 126, 129, 139, 146, 153, 160, 164, 168, 176, 184, 193, 201, 204, 209, 216, 223, 229, 238, 246, 254, 260, 264, 273, 280, 284, 287, 294, 302, 309, 315, 318, 324, 331, 339, 343, 350, 358, 360, 362, 364, 366, 368, 370, 375, 380, 388, 391, 400, 403, 407, 415, 422, 431, 444, 447, 450, 453, 456, 459, 462, 468, 471, 474, 480, 484, 487, 491, 496, 501, 507, 512, 516, 521, 529, 537, 543, 552, 563, 570, 574, 581, 589, 593, 597, 601, 608, 615, 623, 629, 637, 645, 650, 655, 659, 667, 672, 676, 679, 687, 691, 693, 698, 700, 705, 711, 717, 723, 729, 737, 745, 750, 754, 761, 767, 772, 778, 784, 791, 796, 800, 805, 809, 814, 822, 828, 835, 842, 848, 855, 868, 876, 880, 883}
var _Op_index = [...]uint16{0, 3, 7, 13, 17, 21, 28, 31, 34, 37, 39, 42, 48, 52, 58, 64, 73, 85, 94, 103, 115, 124, 126, 129, 139, 146, 153, 160, 164, 168, 176, 184, 193, 201, 204, 209, 216, 223, 229, 238, 246, 254, 260, 264, 273, 280, 284, 287, 294, 302, 309, 315, 318, 324, 331, 339, 343, 350, 358, 360, 362, 364, 366, 368, 370, 375, 380, 388, 391, 400, 403, 407, 415, 422, 431, 444, 447, 450, 453, 456, 459, 462, 468, 471, 474, 480, 484, 487, 491, 496, 501, 507, 512, 516, 521, 529, 537, 543, 552, 563, 570, 574, 581, 589, 593, 597, 601, 608, 615, 623, 629, 637, 645, 650, 655, 659, 667, 672, 676, 679, 687, 691, 693, 698, 700, 705, 711, 717, 723, 729, 737, 742, 746, 753, 759, 764, 770, 776, 783, 788, 792, 797, 801, 806, 814, 820, 827, 834, 840, 847, 860, 868, 872, 875}
func (i Op) String() string {
if i >= Op(len(_Op_index)-1) {

2
src/cmd/compile/internal/types/sizeof_test.go
View File

@ -21,7 +21,7 @@ func TestSizeof(t *testing.T) {
_64bit uintptr // size on 64bit platforms
}{
{Sym{}, 44, 72},
{Type{}, 68, 120},
{Type{}, 60, 104},
{Map{}, 20, 40},
{Forward{}, 20, 32},
{Func{}, 28, 48},

27
src/cmd/compile/internal/types/type.go
View File

@ -178,16 +178,13 @@ type Type struct {
flags bitset8
// For defined (named) generic types, the list of type params (in order)
// of this type that need to be instantiated. For fully-instantiated
// generic types, this is the targs used to instantiate them (which are
// used when generating the corresponding instantiated methods). rparams
// is only set for named types that are generic or are fully-instantiated
// from a generic type.
// TODO(danscales): for space reasons, should probably be a pointer to a
// slice, possibly change the name of this field.
rparams []*Type
// For defined (named) generic types, a pointer to the list of type params
// (in order) of this type that need to be instantiated. For
// fully-instantiated generic types, this is the targs used to instantiate
// them (which are used when generating the corresponding instantiated
// methods). rparams is only set for named types that are generic or are
// fully-instantiated from a generic type, and is otherwise set to nil.
rparams *[]*Type
}
func (*Type) CanBeAnSSAAux() {}
@ -244,11 +241,17 @@ func (t *Type) Pos() src.XPos {
}
func (t *Type) RParams() []*Type {
return t.rparams
if t.rparams == nil {
return nil
}
return *t.rparams
}
func (t *Type) SetRParams(rparams []*Type) {
t.rparams = rparams
if len(rparams) == 0 {
base.Fatalf("Setting nil or zero-length rparams")
}
t.rparams = &rparams
if t.HasTParam() {
return
}