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go/test/codegen/shift.go
Jakub Ciolek cd595be6d6 cmd/compile: prefer an add when shifting left by 1 
ADD(Q|L) has generally twice the throughput.

Came up in CL 626998.

Throughput by arch:

Zen 4:

SHLL (R64, 1):   0.5
ADD  (R64, R64): 0.25

Intel Alder Lake:

SHLL (R64, 1):   0.5
ADD  (R64, R64): 0.2

Intel Haswell:

SHLL (R64, 1):   0.5
ADD  (R64, R64): 0.25

Also include a minor opt for:

(x + x) << c -> x << (c + 1)

Before this, the code:

func addShift(x int64) int64 {
    return (x + x) << 1
}

emitted two instructions:

        ADDQ    AX, AX
        SHLQ    $1, AX

but we can do it in a single shift:

        SHLQ    $2, AX

Add a codegen test for clearing the last bit.

compilecmp linux/amd64:

math
math.sqrt 243 -> 242  (-0.41%)

math [cmd/compile]
math.sqrt 243 -> 242  (-0.41%)

runtime
runtime.selectgo 5455 -> 5445  (-0.18%)
runtime.sysargs 665 -> 662  (-0.45%)
runtime.isPinned 145 -> 141  (-2.76%)
runtime.atoi64 198 -> 194  (-2.02%)
runtime.setPinned 714 -> 709  (-0.70%)

runtime [cmd/compile]
runtime.sysargs 665 -> 662  (-0.45%)
runtime.setPinned 714 -> 709  (-0.70%)
runtime.atoi64 198 -> 194  (-2.02%)
runtime.isPinned 145 -> 141  (-2.76%)

strconv
strconv.computeBounds 109 -> 107  (-1.83%)
strconv.FormatInt 201 -> 197  (-1.99%)
strconv.ryuFtoaShortest 1298 -> 1266  (-2.47%)
strconv.small 144 -> 134  (-6.94%)
strconv.AppendInt 357 -> 344  (-3.64%)
strconv.ryuDigits32 490 -> 488  (-0.41%)
strconv.AppendUint 342 -> 340  (-0.58%)

strconv [cmd/compile]
strconv.FormatInt 201 -> 197  (-1.99%)
strconv.ryuFtoaShortest 1298 -> 1266  (-2.47%)
strconv.ryuDigits32 490 -> 488  (-0.41%)
strconv.AppendUint 342 -> 340  (-0.58%)
strconv.computeBounds 109 -> 107  (-1.83%)
strconv.small 144 -> 134  (-6.94%)
strconv.AppendInt 357 -> 344  (-3.64%)

image
image.Rectangle.Inset 101 -> 97  (-3.96%)

regexp/syntax
regexp/syntax.inCharClass.func1 111 -> 110  (-0.90%)
regexp/syntax.(*compiler).quest 586 -> 573  (-2.22%)
regexp/syntax.ranges.Less 153 -> 150  (-1.96%)
regexp/syntax.(*compiler).loop 583 -> 568  (-2.57%)

time
time.Time.Before 179 -> 161  (-10.06%)
time.Time.Compare 189 -> 166  (-12.17%)
time.Time.Sub 444 -> 425  (-4.28%)
time.Time.UnixMicro 106 -> 95  (-10.38%)
time.div 592 -> 587  (-0.84%)
time.Time.UnixNano 85 -> 78  (-8.24%)
time.(*Time).UnixMilli 141 -> 140  (-0.71%)
time.Time.UnixMilli 106 -> 95  (-10.38%)
time.(*Time).UnixMicro 141 -> 140  (-0.71%)
time.Time.After 179 -> 161  (-10.06%)
time.Time.Equal 170 -> 150  (-11.76%)
time.Time.AppendBinary 766 -> 757  (-1.17%)
time.Time.IsZero 74 -> 66  (-10.81%)
time.(*Time).UnixNano 124 -> 113  (-8.87%)
time.(*Time).IsZero 113 -> 108  (-4.42%)

regexp
regexp.(*Regexp).FindAllStringSubmatch.func1 590 -> 569  (-3.56%)
regexp.QuoteMeta 485 -> 469  (-3.30%)

regexp/syntax [cmd/compile]
regexp/syntax.inCharClass.func1 111 -> 110  (-0.90%)
regexp/syntax.(*compiler).loop 583 -> 568  (-2.57%)
regexp/syntax.(*compiler).quest 586 -> 573  (-2.22%)
regexp/syntax.ranges.Less 153 -> 150  (-1.96%)

encoding/base64
encoding/base64.decodedLen 92 -> 90  (-2.17%)
encoding/base64.(*Encoding).DecodedLen 99 -> 97  (-2.02%)

time [cmd/compile]
time.(*Time).IsZero 113 -> 108  (-4.42%)
time.Time.IsZero 74 -> 66  (-10.81%)
time.(*Time).UnixNano 124 -> 113  (-8.87%)
time.Time.UnixMilli 106 -> 95  (-10.38%)
time.Time.Equal 170 -> 150  (-11.76%)
time.Time.UnixMicro 106 -> 95  (-10.38%)
time.(*Time).UnixMicro 141 -> 140  (-0.71%)
time.Time.Before 179 -> 161  (-10.06%)
time.Time.UnixNano 85 -> 78  (-8.24%)
time.Time.AppendBinary 766 -> 757  (-1.17%)
time.div 592 -> 587  (-0.84%)
time.Time.After 179 -> 161  (-10.06%)
time.Time.Compare 189 -> 166  (-12.17%)
time.(*Time).UnixMilli 141 -> 140  (-0.71%)
time.Time.Sub 444 -> 425  (-4.28%)

index/suffixarray
index/suffixarray.sais_8_32 1677 -> 1645  (-1.91%)
index/suffixarray.sais_32 1677 -> 1645  (-1.91%)
index/suffixarray.sais_64 1677 -> 1654  (-1.37%)
index/suffixarray.sais_8_64 1677 -> 1654  (-1.37%)
index/suffixarray.writeInt 249 -> 247  (-0.80%)

os
os.Expand 1070 -> 1051  (-1.78%)
os.Chtimes 787 -> 774  (-1.65%)

regexp [cmd/compile]
regexp.(*Regexp).FindAllStringSubmatch.func1 590 -> 569  (-3.56%)
regexp.QuoteMeta 485 -> 469  (-3.30%)

encoding/base64 [cmd/compile]
encoding/base64.decodedLen 92 -> 90  (-2.17%)
encoding/base64.(*Encoding).DecodedLen 99 -> 97  (-2.02%)

encoding/hex
encoding/hex.Encode 138 -> 136  (-1.45%)
encoding/hex.(*decoder).Read 830 -> 824  (-0.72%)

crypto/des
crypto/des.initFeistelBox 235 -> 229  (-2.55%)
crypto/des.cryptBlock 549 -> 538  (-2.00%)

os [cmd/compile]
os.Chtimes 787 -> 774  (-1.65%)
os.Expand 1070 -> 1051  (-1.78%)

math/big
math/big.newFloat 238 -> 223  (-6.30%)
math/big.nat.mul 2138 -> 2122  (-0.75%)
math/big.karatsubaSqr 1372 -> 1369  (-0.22%)
math/big.(*Float).sqrtInverse 895 -> 878  (-1.90%)
math/big.basicSqr 1032 -> 1017  (-1.45%)

cmd/vendor/golang.org/x/sys/unix
cmd/vendor/golang.org/x/sys/unix.TimeToTimespec 72 -> 66  (-8.33%)

encoding/json
encoding/json.Indent 404 -> 403  (-0.25%)
encoding/json.MarshalIndent 303 -> 297  (-1.98%)

testing
testing.(*T).Deadline 84 -> 82  (-2.38%)
testing.(*M).Run 3545 -> 3525  (-0.56%)

archive/zip
archive/zip.headerFileInfo.ModTime 229 -> 223  (-2.62%)

encoding/gob
encoding/gob.(*encoderState).encodeInt 474 -> 469  (-1.05%)

crypto/elliptic
crypto/elliptic.Marshal 728 -> 714  (-1.92%)

debug/buildinfo
debug/buildinfo.readString 325 -> 315  (-3.08%)

image/png
image/png.(*decoder).readImagePass 10866 -> 10834  (-0.29%)

archive/tar
archive/tar.Header.allowedFormats.func3 1768 -> 1736  (-1.81%)
archive/tar.formatPAXTime 389 -> 358  (-7.97%)
archive/tar.(*Writer).writeGNUHeader 741 -> 727  (-1.89%)
archive/tar.readGNUSparseMap0x1 709 -> 695  (-1.97%)
archive/tar.(*Writer).templateV7Plus 915 -> 909  (-0.66%)

crypto/internal/cryptotest
crypto/internal/cryptotest.TestHash.func4 890 -> 879  (-1.24%)
crypto/internal/cryptotest.TestStream.func6.1 646 -> 645  (-0.15%)
crypto/internal/cryptotest.testCipher.func3 1300 -> 1289  (-0.85%)

internal/pkgbits
internal/pkgbits.(*Encoder).Int64 113 -> 103  (-8.85%)
internal/pkgbits.(*Encoder).rawVarint 74 -> 72  (-2.70%)

testing/quick
testing/quick.(*Config).getRand 316 -> 315  (-0.32%)

log/slog
log/slog.TimeValue 489 -> 479  (-2.04%)

runtime/pprof
runtime/pprof.(*profileBuilder).build 2341 -> 2322  (-0.81%)

internal/coverage/cfile
internal/coverage/cfile.(*emitState).openMetaFile 824 -> 822  (-0.24%)
internal/coverage/cfile.(*emitState).openCounterFile 904 -> 892  (-1.33%)

cmd/internal/objabi
cmd/internal/objabi.expandArgs 1177 -> 1169  (-0.68%)

crypto/ecdsa
crypto/ecdsa.pointFromAffine 1162 -> 1144  (-1.55%)

net
net.minNonzeroTime 313 -> 308  (-1.60%)
net.cgoLookupAddrPTR 812 -> 797  (-1.85%)
net.(*IPNet).String 851 -> 827  (-2.82%)
net.IP.AppendText 488 -> 471  (-3.48%)
net.IPMask.String 281 -> 270  (-3.91%)
net.partialDeadline 374 -> 366  (-2.14%)
net.hexString 249 -> 240  (-3.61%)
net.IP.String 454 -> 453  (-0.22%)

internal/fuzz
internal/fuzz.newPcgRand 240 -> 234  (-2.50%)

crypto/x509
crypto/x509.(*Certificate).isValid 2642 -> 2611  (-1.17%)

cmd/internal/obj/s390x
cmd/internal/obj/s390x.buildop 33676 -> 33644  (-0.10%)

encoding/hex [cmd/compile]
encoding/hex.(*decoder).Read 830 -> 824  (-0.72%)
encoding/hex.Encode 138 -> 136  (-1.45%)

cmd/internal/objabi [cmd/compile]
cmd/internal/objabi.expandArgs 1177 -> 1169  (-0.68%)

math/big [cmd/compile]
math/big.(*Float).sqrtInverse 895 -> 878  (-1.90%)
math/big.nat.mul 2138 -> 2122  (-0.75%)
math/big.karatsubaSqr 1372 -> 1369  (-0.22%)
math/big.basicSqr 1032 -> 1017  (-1.45%)
math/big.newFloat 238 -> 223  (-6.30%)

encoding/json [cmd/compile]
encoding/json.MarshalIndent 303 -> 297  (-1.98%)
encoding/json.Indent 404 -> 403  (-0.25%)

cmd/covdata
main.(*metaMerge).emitCounters 985 -> 973  (-1.22%)

runtime/pprof [cmd/compile]
runtime/pprof.(*profileBuilder).build 2341 -> 2322  (-0.81%)

cmd/compile/internal/syntax
cmd/compile/internal/syntax.(*source).fill 722 -> 703  (-2.63%)

cmd/dist
main.runInstall 19081 -> 19049  (-0.17%)

crypto/tls
crypto/tls.extractPadding 176 -> 175  (-0.57%)
slices.Clone[[]crypto/tls.SignatureScheme,crypto/tls.SignatureScheme] 253 -> 247  (-2.37%)
slices.Clone[[]uint16,uint16] 253 -> 247  (-2.37%)
slices.Clone[[]crypto/tls.CurveID,crypto/tls.CurveID] 253 -> 247  (-2.37%)
crypto/tls.(*Config).cipherSuites 335 -> 326  (-2.69%)
slices.DeleteFunc[go.shape.[]crypto/tls.CurveID,go.shape.uint16] 437 -> 434  (-0.69%)
crypto/tls.dial 1349 -> 1339  (-0.74%)
slices.DeleteFunc[go.shape.[]uint16,go.shape.uint16] 437 -> 434  (-0.69%)

internal/pkgbits [cmd/compile]
internal/pkgbits.(*Encoder).Int64 113 -> 103  (-8.85%)
internal/pkgbits.(*Encoder).rawVarint 74 -> 72  (-2.70%)

cmd/compile/internal/syntax [cmd/compile]
cmd/compile/internal/syntax.(*source).fill 722 -> 703  (-2.63%)

cmd/internal/obj/s390x [cmd/compile]
cmd/internal/obj/s390x.buildop 33676 -> 33644  (-0.10%)

cmd/go/internal/trace
cmd/go/internal/trace.Flow 910 -> 886  (-2.64%)
cmd/go/internal/trace.(*Span).Done 311 -> 304  (-2.25%)
cmd/go/internal/trace.StartSpan 620 -> 615  (-0.81%)

cmd/internal/script
cmd/internal/script.(*Engine).Execute.func2 534 -> 528  (-1.12%)

cmd/link/internal/loader
cmd/link/internal/loader.(*Loader).SetSymSect 344 -> 338  (-1.74%)

net/http
net/http.(*Transport).queueForIdleConn 1797 -> 1766  (-1.73%)
net/http.(*Transport).getConn 2149 -> 2131  (-0.84%)
net/http.(*http2ClientConn).tooIdleLocked 207 -> 197  (-4.83%)
net/http.(*http2responseWriter).SetWriteDeadline.func1 520 -> 508  (-2.31%)
net/http.(*Cookie).Valid 837 -> 818  (-2.27%)
net/http.(*http2responseWriter).SetReadDeadline 373 -> 357  (-4.29%)
net/http.checkIfRange 701 -> 690  (-1.57%)
net/http.(*http2SettingsFrame).Value 325 -> 298  (-8.31%)
net/http.(*http2SettingsFrame).HasDuplicates 777 -> 767  (-1.29%)
net/http.(*Server).Serve 1746 -> 1739  (-0.40%)
net/http.http2traceGotConn 569 -> 556  (-2.28%)

net/http/pprof
net/http/pprof.collectProfile 242 -> 239  (-1.24%)

cmd/compile/internal/coverage
cmd/compile/internal/coverage.metaHashAndLen 439 -> 438  (-0.23%)

cmd/vendor/golang.org/x/telemetry/internal/upload
cmd/vendor/golang.org/x/telemetry/internal/upload.(*uploader).findWork 4570 -> 4540  (-0.66%)
cmd/vendor/golang.org/x/telemetry/internal/upload.(*uploader).reports 3604 -> 3572  (-0.89%)

cmd/compile/internal/coverage [cmd/compile]
cmd/compile/internal/coverage.metaHashAndLen 439 -> 438  (-0.23%)

cmd/vendor/golang.org/x/text/language
cmd/vendor/golang.org/x/text/language.regionGroupDist 287 -> 284  (-1.05%)

cmd/go/internal/vcweb
cmd/go/internal/vcweb.(*Server).overview.func1 1045 -> 1041  (-0.38%)

cmd/go/internal/vcs
cmd/go/internal/vcs.expand 761 -> 741  (-2.63%)

cmd/compile/internal/inline/inlheur
slices.stableCmpFunc[go.shape.struct 2300 -> 2284  (-0.70%)

cmd/compile/internal/inline/inlheur [cmd/compile]
slices.stableCmpFunc[go.shape.struct 2300 -> 2284  (-0.70%)

cmd/go/internal/modfetch/codehost
cmd/go/internal/modfetch/codehost.bzrParseStat 2217 -> 2213  (-0.18%)

cmd/link/internal/ld
cmd/link/internal/ld.decodetypeStructFieldCount 157 -> 152  (-3.18%)
cmd/link/internal/ld.(*Link).address 12559 -> 12495  (-0.51%)
cmd/link/internal/ld.(*dodataState).allocateDataSections 18345 -> 18205  (-0.76%)
cmd/link/internal/ld.elfshreloc 618 -> 616  (-0.32%)
cmd/link/internal/ld.(*deadcodePass).decodetypeMethods 794 -> 779  (-1.89%)
cmd/link/internal/ld.(*dodataState).assignDsymsToSection 668 -> 663  (-0.75%)
cmd/link/internal/ld.relocSectFn 285 -> 284  (-0.35%)
cmd/link/internal/ld.decodetypeIfaceMethodCount 146 -> 144  (-1.37%)
cmd/link/internal/ld.decodetypeArrayLen 157 -> 152  (-3.18%)

cmd/link/internal/arm64
cmd/link/internal/arm64.gensymlate.func1 895 -> 888  (-0.78%)

cmd/go/internal/modload
cmd/go/internal/modload.queryProxy.func3 1029 -> 1012  (-1.65%)

cmd/go/internal/load
cmd/go/internal/load.(*Package).setBuildInfo 8453 -> 8447  (-0.07%)

cmd/go/internal/clean
cmd/go/internal/clean.runClean 2120 -> 2104  (-0.75%)

cmd/compile/internal/ssa
cmd/compile/internal/ssa.(*poset).aliasnodes 2010 -> 1978  (-1.59%)
cmd/compile/internal/ssa.rewriteValueARM64_OpARM64MOVHstoreidx2 730 -> 719  (-1.51%)
cmd/compile/internal/ssa.(*debugState).buildLocationLists 3326 -> 3294  (-0.96%)
cmd/compile/internal/ssa.rewriteValueAMD64_OpAMD64ADDLconst 3069 -> 2941  (-4.17%)
cmd/compile/internal/ssa.(*debugState).processValue 9756 -> 9724  (-0.33%)
cmd/compile/internal/ssa.rewriteValueAMD64_OpAMD64ADDQconst 3069 -> 2941  (-4.17%)
cmd/compile/internal/ssa.(*poset).mergeroot 1079 -> 1054  (-2.32%)

cmd/compile/internal/ssa [cmd/compile]
cmd/compile/internal/ssa.rewriteValueARM64_OpARM64MOVHstoreidx2 730 -> 719  (-1.51%)
cmd/compile/internal/ssa.(*poset).aliasnodes 2010 -> 1978  (-1.59%)
cmd/compile/internal/ssa.(*poset).mergeroot 1079 -> 1054  (-2.32%)
cmd/compile/internal/ssa.rewriteValueAMD64_OpAMD64ADDQconst 3069 -> 2941  (-4.17%)
cmd/compile/internal/ssa.rewriteValueAMD64_OpAMD64ADDLconst 3069 -> 2941  (-4.17%)

file                                                before   after    Δ       %
math/bits.s                                         2352     2354     +2      +0.085%
math/bits [cmd/compile].s                           2352     2354     +2      +0.085%
math.s                                              35675    35674    -1      -0.003%
math [cmd/compile].s                                35675    35674    -1      -0.003%
runtime.s                                           577251   577245   -6      -0.001%
runtime [cmd/compile].s                             642419   642438   +19     +0.003%
sort.s                                              37434    37435    +1      +0.003%
strconv.s                                           48391    48343    -48     -0.099%
sort [cmd/compile].s                                37434    37435    +1      +0.003%
bufio.s                                             21386    21418    +32     +0.150%
strconv [cmd/compile].s                             48391    48343    -48     -0.099%
image.s                                             34978    35022    +44     +0.126%
regexp/syntax.s                                     81719    81781    +62     +0.076%
time.s                                              94341    94184    -157    -0.166%
regexp.s                                            60411    60399    -12     -0.020%
bufio [cmd/compile].s                               21512    21544    +32     +0.149%
encoding/binary.s                                   34062    34087    +25     +0.073%
regexp/syntax [cmd/compile].s                       81719    81781    +62     +0.076%
encoding/base64.s                                   11907    11903    -4      -0.034%
time [cmd/compile].s                                94341    94184    -157    -0.166%
index/suffixarray.s                                 41633    41527    -106    -0.255%
os.s                                                101770   101738   -32     -0.031%
regexp [cmd/compile].s                              60411    60399    -12     -0.020%
encoding/binary [cmd/compile].s                     37173    37198    +25     +0.067%
encoding/base64 [cmd/compile].s                     11907    11903    -4      -0.034%
os/exec.s                                           23900    23907    +7      +0.029%
encoding/hex.s                                      6038     6030     -8      -0.132%
crypto/des.s                                        5073     5056     -17     -0.335%
os [cmd/compile].s                                  102030   101998   -32     -0.031%
vendor/golang.org/x/net/http2/hpack.s               22027    22033    +6      +0.027%
math/big.s                                          164808   164753   -55     -0.033%
cmd/vendor/golang.org/x/sys/unix.s                  121450   121444   -6      -0.005%
encoding/json.s                                     110294   110287   -7      -0.006%
testing.s                                           115303   115281   -22     -0.019%
archive/zip.s                                       65329    65325    -4      -0.006%
os/user.s                                           10078    10080    +2      +0.020%
encoding/gob.s                                      143788   143783   -5      -0.003%
crypto/elliptic.s                                   30686    30704    +18     +0.059%
go/doc/comment.s                                    49401    49433    +32     +0.065%
debug/buildinfo.s                                   9095     9085     -10     -0.110%
image/png.s                                         36113    36081    -32     -0.089%
archive/tar.s                                       71994    71897    -97     -0.135%
crypto/internal/cryptotest.s                        60872    60849    -23     -0.038%
internal/pkgbits.s                                  20441    20429    -12     -0.059%
testing/quick.s                                     8236     8235     -1      -0.012%
log/slog.s                                          77568    77558    -10     -0.013%
internal/trace/internal/oldtrace.s                  52885    52896    +11     +0.021%
runtime/pprof.s                                     123978   123969   -9      -0.007%
internal/coverage/cfile.s                           25198    25184    -14     -0.056%
cmd/internal/objabi.s                               19954    19946    -8      -0.040%
crypto/ecdsa.s                                      29159    29141    -18     -0.062%
log/slog/internal/benchmarks.s                      6694     6695     +1      +0.015%
net.s                                               299569   299503   -66     -0.022%
os/exec [cmd/compile].s                             23888    23895    +7      +0.029%
internal/trace.s                                    179226   179240   +14     +0.008%
internal/fuzz.s                                     86190    86191    +1      +0.001%
crypto/x509.s                                       177195   177164   -31     -0.017%
cmd/internal/obj/s390x.s                            121642   121610   -32     -0.026%
cmd/internal/obj/ppc64.s                            140118   140122   +4      +0.003%
encoding/hex [cmd/compile].s                        6149     6141     -8      -0.130%
cmd/internal/objabi [cmd/compile].s                 19954    19946    -8      -0.040%
cmd/internal/obj/arm64.s                            158523   158555   +32     +0.020%
go/doc/comment [cmd/compile].s                      49512    49544    +32     +0.065%
math/big [cmd/compile].s                            166394   166339   -55     -0.033%
encoding/json [cmd/compile].s                       110712   110705   -7      -0.006%
cmd/covdata.s                                       39699    39687    -12     -0.030%
runtime/pprof [cmd/compile].s                       125209   125200   -9      -0.007%
cmd/compile/internal/syntax.s                       181755   181736   -19     -0.010%
cmd/dist.s                                          177893   177861   -32     -0.018%
crypto/tls.s                                        389157   389113   -44     -0.011%
internal/pkgbits [cmd/compile].s                    41644    41632    -12     -0.029%
cmd/compile/internal/syntax [cmd/compile].s         196105   196086   -19     -0.010%
cmd/compile/internal/types.s                        71315    71345    +30     +0.042%
cmd/internal/obj/s390x [cmd/compile].s              121733   121701   -32     -0.026%
cmd/go/internal/trace.s                             4796     4760     -36     -0.751%
cmd/internal/obj/arm64 [cmd/compile].s              168120   168147   +27     +0.016%
cmd/internal/obj/ppc64 [cmd/compile].s              140219   140223   +4      +0.003%
cmd/internal/script.s                               83442    83436    -6      -0.007%
cmd/link/internal/loader.s                          93299    93294    -5      -0.005%
net/http.s                                          620639   620472   -167    -0.027%
net/http/pprof.s                                    35016    35013    -3      -0.009%
cmd/compile/internal/coverage.s                     6668     6667     -1      -0.015%
cmd/vendor/golang.org/x/telemetry/internal/upload.s 34210    34148    -62     -0.181%
cmd/compile/internal/coverage [cmd/compile].s       6664     6663     -1      -0.015%
cmd/vendor/golang.org/x/text/language.s             48077    48074    -3      -0.006%
cmd/go/internal/vcweb.s                             45193    45189    -4      -0.009%
cmd/go/internal/vcs.s                               44749    44729    -20     -0.045%
cmd/compile/internal/inline/inlheur.s               83758    83742    -16     -0.019%
cmd/compile/internal/inline/inlheur [cmd/compile].s 84773    84757    -16     -0.019%
cmd/go/internal/modfetch/codehost.s                 89098    89094    -4      -0.004%
cmd/trace.s                                         257550   257564   +14     +0.005%
cmd/link/internal/ld.s                              641945   641706   -239    -0.037%
cmd/link/internal/arm64.s                           34805    34798    -7      -0.020%
cmd/go/internal/modload.s                           328971   328954   -17     -0.005%
cmd/go/internal/load.s                              178877   178871   -6      -0.003%
cmd/go/internal/clean.s                             11006    10990    -16     -0.145%
cmd/compile/internal/ssa.s                          3552843  3553347  +504    +0.014%
cmd/compile/internal/ssa [cmd/compile].s            3752511  3753123  +612    +0.016%
total                                               36179015 36178687 -328    -0.001%

Change-Id: I251c2898ccf3c9931d162d87dabbd49cf4ec73a5
Reviewed-on: https://go-review.googlesource.com/c/go/+/641757
Reviewed-by: Keith Randall <khr@google.com>
Auto-Submit: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
2025-02-06 09:05:20 -08:00

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// asmcheck
// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package codegen
// ------------------ //
// constant shifts //
// ------------------ //
func lshConst64x64(v int64) int64 {
// ppc64x:"SLD"
// riscv64:"SLLI",-"AND",-"SLTIU"
return v << uint64(33)
}
func rshConst64Ux64(v uint64) uint64 {
// ppc64x:"SRD"
// riscv64:"SRLI\t",-"AND",-"SLTIU"
return v >> uint64(33)
}
func rshConst64Ux64Overflow32(v uint32) uint64 {
// riscv64:"MOV\t\\$0,",-"SRL"
return uint64(v) >> 32
}
func rshConst64Ux64Overflow16(v uint16) uint64 {
// riscv64:"MOV\t\\$0,",-"SRL"
return uint64(v) >> 16
}
func rshConst64Ux64Overflow8(v uint8) uint64 {
// riscv64:"MOV\t\\$0,",-"SRL"
return uint64(v) >> 8
}
func rshConst64x64(v int64) int64 {
// ppc64x:"SRAD"
// riscv64:"SRAI\t",-"OR",-"SLTIU"
return v >> uint64(33)
}
func rshConst64x64Overflow32(v int32) int64 {
// riscv64:"SRAIW",-"SLLI",-"SRAI\t"
return int64(v) >> 32
}
func rshConst64x64Overflow16(v int16) int64 {
// riscv64:"SLLI","SRAI",-"SRAIW"
return int64(v) >> 16
}
func rshConst64x64Overflow8(v int8) int64 {
// riscv64:"SLLI","SRAI",-"SRAIW"
return int64(v) >> 8
}
func lshConst32x1(v int32) int32 {
// amd64:"ADDL", -"SHLL"
return v << 1
}
func lshConst64x1(v int64) int64 {
// amd64:"ADDQ", -"SHLQ"
return v << 1
}
func lshConst32x64(v int32) int32 {
// ppc64x:"SLW"
// riscv64:"SLLI",-"AND",-"SLTIU", -"MOVW"
return v << uint64(29)
}
func rshConst32Ux64(v uint32) uint32 {
// ppc64x:"SRW"
// riscv64:"SRLIW",-"AND",-"SLTIU", -"MOVW"
return v >> uint64(29)
}
func rshConst32x64(v int32) int32 {
// ppc64x:"SRAW"
// riscv64:"SRAIW",-"OR",-"SLTIU", -"MOVW"
return v >> uint64(29)
}
func lshConst64x32(v int64) int64 {
// ppc64x:"SLD"
// riscv64:"SLLI",-"AND",-"SLTIU"
return v << uint32(33)
}
func rshConst64Ux32(v uint64) uint64 {
// ppc64x:"SRD"
// riscv64:"SRLI\t",-"AND",-"SLTIU"
return v >> uint32(33)
}
func rshConst64x32(v int64) int64 {
// ppc64x:"SRAD"
// riscv64:"SRAI\t",-"OR",-"SLTIU"
return v >> uint32(33)
}
func lshConst32x1Add(x int32) int32 {
// amd64:"SHLL\t[$]2"
return (x + x) << 1
}
func lshConst64x1Add(x int64) int64 {
// amd64:"SHLQ\t[$]2"
return (x + x) << 1
}
func lshConst32x2Add(x int32) int32 {
// amd64:"SHLL\t[$]3"
return (x + x) << 2
}
func lshConst64x2Add(x int64) int64 {
// amd64:"SHLQ\t[$]3"
return (x + x) << 2
}
// ------------------ //
// masked shifts //
// ------------------ //
func lshMask64x64(v int64, s uint64) int64 {
// arm64:"LSL",-"AND"
// ppc64x:"RLDICL",-"ORN",-"ISEL"
// riscv64:"SLL",-"AND\t",-"SLTIU"
// s390x:-"RISBGZ",-"AND",-"LOCGR"
return v << (s & 63)
}
func rshMask64Ux64(v uint64, s uint64) uint64 {
// arm64:"LSR",-"AND",-"CSEL"
// ppc64x:"RLDICL",-"ORN",-"ISEL"
// riscv64:"SRL\t",-"AND\t",-"SLTIU"
// s390x:-"RISBGZ",-"AND",-"LOCGR"
return v >> (s & 63)
}
func rshMask64x64(v int64, s uint64) int64 {
// arm64:"ASR",-"AND",-"CSEL"
// ppc64x:"RLDICL",-"ORN",-"ISEL"
// riscv64:"SRA\t",-"OR",-"SLTIU"
// s390x:-"RISBGZ",-"AND",-"LOCGR"
return v >> (s & 63)
}
func lshMask32x64(v int32, s uint64) int32 {
// arm64:"LSL",-"AND"
// ppc64x:"ISEL",-"ORN"
// riscv64:"SLL",-"AND\t",-"SLTIU"
// s390x:-"RISBGZ",-"AND",-"LOCGR"
return v << (s & 63)
}
func rshMask32Ux64(v uint32, s uint64) uint32 {
// arm64:"LSR",-"AND"
// ppc64x:"ISEL",-"ORN"
// riscv64:"SRLW","SLTIU","NEG","AND\t",-"SRL\t"
// s390x:-"RISBGZ",-"AND",-"LOCGR"
return v >> (s & 63)
}
func rsh5Mask32Ux64(v uint32, s uint64) uint32 {
// riscv64:"SRLW",-"AND\t",-"SLTIU",-"SRL\t"
return v >> (s & 31)
}
func rshMask32x64(v int32, s uint64) int32 {
// arm64:"ASR",-"AND"
// ppc64x:"ISEL",-"ORN"
// riscv64:"SRAW","OR","SLTIU"
// s390x:-"RISBGZ",-"AND",-"LOCGR"
return v >> (s & 63)
}
func rsh5Mask32x64(v int32, s uint64) int32 {
// riscv64:"SRAW",-"OR",-"SLTIU"
return v >> (s & 31)
}
func lshMask64x32(v int64, s uint32) int64 {
// arm64:"LSL",-"AND"
// ppc64x:"RLDICL",-"ORN"
// riscv64:"SLL",-"AND\t",-"SLTIU"
// s390x:-"RISBGZ",-"AND",-"LOCGR"
return v << (s & 63)
}
func rshMask64Ux32(v uint64, s uint32) uint64 {
// arm64:"LSR",-"AND",-"CSEL"
// ppc64x:"RLDICL",-"ORN"
// riscv64:"SRL\t",-"AND\t",-"SLTIU"
// s390x:-"RISBGZ",-"AND",-"LOCGR"
return v >> (s & 63)
}
func rshMask64x32(v int64, s uint32) int64 {
// arm64:"ASR",-"AND",-"CSEL"
// ppc64x:"RLDICL",-"ORN",-"ISEL"
// riscv64:"SRA\t",-"OR",-"SLTIU"
// s390x:-"RISBGZ",-"AND",-"LOCGR"
return v >> (s & 63)
}
func lshMask64x32Ext(v int64, s int32) int64 {
// ppc64x:"RLDICL",-"ORN",-"ISEL"
// riscv64:"SLL",-"AND\t",-"SLTIU"
// s390x:-"RISBGZ",-"AND",-"LOCGR"
return v << uint(s&63)
}
func rshMask64Ux32Ext(v uint64, s int32) uint64 {
// ppc64x:"RLDICL",-"ORN",-"ISEL"
// riscv64:"SRL\t",-"AND\t",-"SLTIU"
// s390x:-"RISBGZ",-"AND",-"LOCGR"
return v >> uint(s&63)
}
func rshMask64x32Ext(v int64, s int32) int64 {
// ppc64x:"RLDICL",-"ORN",-"ISEL"
// riscv64:"SRA\t",-"OR",-"SLTIU"
// s390x:-"RISBGZ",-"AND",-"LOCGR"
return v >> uint(s&63)
}
// --------------- //
// signed shifts //
// --------------- //
// We do want to generate a test + panicshift for these cases.
func lshSigned(v8 int8, v16 int16, v32 int32, v64 int64, x int) {
// amd64:"TESTB"
_ = x << v8
// amd64:"TESTW"
_ = x << v16
// amd64:"TESTL"
_ = x << v32
// amd64:"TESTQ"
_ = x << v64
}
// We want to avoid generating a test + panicshift for these cases.
func lshSignedMasked(v8 int8, v16 int16, v32 int32, v64 int64, x int) {
// amd64:-"TESTB"
_ = x << (v8 & 7)
// amd64:-"TESTW"
_ = x << (v16 & 15)
// amd64:-"TESTL"
_ = x << (v32 & 31)
// amd64:-"TESTQ"
_ = x << (v64 & 63)
}
// ------------------ //
// bounded shifts //
// ------------------ //
func lshGuarded64(v int64, s uint) int64 {
if s < 64 {
// riscv64:"SLL",-"AND",-"SLTIU"
// s390x:-"RISBGZ",-"AND",-"LOCGR"
// wasm:-"Select",-".*LtU"
// arm64:"LSL",-"CSEL"
return v << s
}
panic("shift too large")
}
func rshGuarded64U(v uint64, s uint) uint64 {
if s < 64 {
// riscv64:"SRL\t",-"AND",-"SLTIU"
// s390x:-"RISBGZ",-"AND",-"LOCGR"
// wasm:-"Select",-".*LtU"
// arm64:"LSR",-"CSEL"
return v >> s
}
panic("shift too large")
}
func rshGuarded64(v int64, s uint) int64 {
if s < 64 {
// riscv64:"SRA\t",-"OR",-"SLTIU"
// s390x:-"RISBGZ",-"AND",-"LOCGR"
// wasm:-"Select",-".*LtU"
// arm64:"ASR",-"CSEL"
return v >> s
}
panic("shift too large")
}
func provedUnsignedShiftLeft(val64 uint64, val32 uint32, val16 uint16, val8 uint8, shift int) (r1 uint64, r2 uint32, r3 uint16, r4 uint8) {
if shift >= 0 && shift < 64 {
// arm64:"LSL",-"CSEL"
r1 = val64 << shift
}
if shift >= 0 && shift < 32 {
// arm64:"LSL",-"CSEL"
r2 = val32 << shift
}
if shift >= 0 && shift < 16 {
// arm64:"LSL",-"CSEL"
r3 = val16 << shift
}
if shift >= 0 && shift < 8 {
// arm64:"LSL",-"CSEL"
r4 = val8 << shift
}
return r1, r2, r3, r4
}
func provedSignedShiftLeft(val64 int64, val32 int32, val16 int16, val8 int8, shift int) (r1 int64, r2 int32, r3 int16, r4 int8) {
if shift >= 0 && shift < 64 {
// arm64:"LSL",-"CSEL"
r1 = val64 << shift
}
if shift >= 0 && shift < 32 {
// arm64:"LSL",-"CSEL"
r2 = val32 << shift
}
if shift >= 0 && shift < 16 {
// arm64:"LSL",-"CSEL"
r3 = val16 << shift
}
if shift >= 0 && shift < 8 {
// arm64:"LSL",-"CSEL"
r4 = val8 << shift
}
return r1, r2, r3, r4
}
func provedUnsignedShiftRight(val64 uint64, val32 uint32, val16 uint16, val8 uint8, shift int) (r1 uint64, r2 uint32, r3 uint16, r4 uint8) {
if shift >= 0 && shift < 64 {
// arm64:"LSR",-"CSEL"
r1 = val64 >> shift
}
if shift >= 0 && shift < 32 {
// arm64:"LSR",-"CSEL"
r2 = val32 >> shift
}
if shift >= 0 && shift < 16 {
// arm64:"LSR",-"CSEL"
r3 = val16 >> shift
}
if shift >= 0 && shift < 8 {
// arm64:"LSR",-"CSEL"
r4 = val8 >> shift
}
return r1, r2, r3, r4
}
func provedSignedShiftRight(val64 int64, val32 int32, val16 int16, val8 int8, shift int) (r1 int64, r2 int32, r3 int16, r4 int8) {
if shift >= 0 && shift < 64 {
// arm64:"ASR",-"CSEL"
r1 = val64 >> shift
}
if shift >= 0 && shift < 32 {
// arm64:"ASR",-"CSEL"
r2 = val32 >> shift
}
if shift >= 0 && shift < 16 {
// arm64:"ASR",-"CSEL"
r3 = val16 >> shift
}
if shift >= 0 && shift < 8 {
// arm64:"ASR",-"CSEL"
r4 = val8 >> shift
}
return r1, r2, r3, r4
}
func checkUnneededTrunc(tab *[100000]uint32, d uint64, v uint32, h uint16, b byte) (uint32, uint64) {
// ppc64x:-".*RLWINM",-".*RLDICR",".*CLRLSLDI"
f := tab[byte(v)^b]
// ppc64x:-".*RLWINM",-".*RLDICR",".*CLRLSLDI"
f += tab[byte(v)&b]
// ppc64x:-".*RLWINM",-".*RLDICR",".*CLRLSLDI"
f += tab[byte(v)|b]
// ppc64x:-".*RLWINM",-".*RLDICR",".*CLRLSLDI"
f += tab[uint16(v)&h]
// ppc64x:-".*RLWINM",-".*RLDICR",".*CLRLSLDI"
f += tab[uint16(v)^h]
// ppc64x:-".*RLWINM",-".*RLDICR",".*CLRLSLDI"
f += tab[uint16(v)|h]
// ppc64x:-".*AND",-"RLDICR",".*CLRLSLDI"
f += tab[v&0xff]
// ppc64x:-".*AND",".*CLRLSLWI"
f += 2 * uint32(uint16(d))
// ppc64x:-".*AND",-"RLDICR",".*CLRLSLDI"
g := 2 * uint64(uint32(d))
return f, g
}
func checkCombinedShifts(v8 uint8, v16 uint16, v32 uint32, x32 int32, v64 uint64) (uint8, uint16, uint32, uint64, int64) {
// ppc64x:-"AND","CLRLSLWI"
f := (v8 & 0xF) << 2
// ppc64x:"CLRLSLWI"
f += byte(v16) << 3
// ppc64x:-"AND","CLRLSLWI"
g := (v16 & 0xFF) << 3
// ppc64x:-"AND","CLRLSLWI"
h := (v32 & 0xFFFFF) << 2
// ppc64x:"CLRLSLDI"
i := (v64 & 0xFFFFFFFF) << 5
// ppc64x:-"CLRLSLDI"
i += (v64 & 0xFFFFFFF) << 38
// ppc64x/power9:-"CLRLSLDI"
i += (v64 & 0xFFFF00) << 10
// ppc64x/power9:-"SLD","EXTSWSLI"
j := int64(x32+32) * 8
return f, g, h, i, j
}
func checkWidenAfterShift(v int64, u uint64) (int64, uint64) {
// ppc64x:-".*MOVW"
f := int32(v >> 32)
// ppc64x:".*MOVW"
f += int32(v >> 31)
// ppc64x:-".*MOVH"
g := int16(v >> 48)
// ppc64x:".*MOVH"
g += int16(v >> 30)
// ppc64x:-".*MOVH"
g += int16(f >> 16)
// ppc64x:-".*MOVB"
h := int8(v >> 56)
// ppc64x:".*MOVB"
h += int8(v >> 28)
// ppc64x:-".*MOVB"
h += int8(f >> 24)
// ppc64x:".*MOVB"
h += int8(f >> 16)
return int64(h), uint64(g)
}
func checkShiftAndMask32(v []uint32) {
i := 0
// ppc64x: "RLWNM\t[$]24, R[0-9]+, [$]12, [$]19, R[0-9]+"
v[i] = (v[i] & 0xFF00000) >> 8
i++
// ppc64x: "RLWNM\t[$]26, R[0-9]+, [$]22, [$]29, R[0-9]+"
v[i] = (v[i] & 0xFF00) >> 6
i++
// ppc64x: "MOVW\tR0"
v[i] = (v[i] & 0xFF) >> 8
i++
// ppc64x: "MOVW\tR0"
v[i] = (v[i] & 0xF000000) >> 28
i++
// ppc64x: "RLWNM\t[$]26, R[0-9]+, [$]24, [$]31, R[0-9]+"
v[i] = (v[i] >> 6) & 0xFF
i++
// ppc64x: "RLWNM\t[$]26, R[0-9]+, [$]12, [$]19, R[0-9]+"
v[i] = (v[i] >> 6) & 0xFF000
i++
// ppc64x: "MOVW\tR0"
v[i] = (v[i] >> 20) & 0xFF000
i++
// ppc64x: "MOVW\tR0"
v[i] = (v[i] >> 24) & 0xFF00
i++
}
func checkMergedShifts32(a [256]uint32, b [256]uint64, u uint32, v uint32) {
// ppc64x: -"CLRLSLDI", "RLWNM\t[$]10, R[0-9]+, [$]22, [$]29, R[0-9]+"
a[0] = a[uint8(v>>24)]
// ppc64x: -"CLRLSLDI", "RLWNM\t[$]11, R[0-9]+, [$]21, [$]28, R[0-9]+"
b[0] = b[uint8(v>>24)]
// ppc64x: -"CLRLSLDI", "RLWNM\t[$]15, R[0-9]+, [$]21, [$]28, R[0-9]+"
b[1] = b[(v>>20)&0xFF]
// ppc64x: -"SLD", "RLWNM\t[$]10, R[0-9]+, [$]22, [$]28, R[0-9]+"
b[2] = b[v>>25]
}
func checkMergedShifts64(a [256]uint32, b [256]uint64, c [256]byte, v uint64) {
// ppc64x: -"CLRLSLDI", "RLWNM\t[$]10, R[0-9]+, [$]22, [$]29, R[0-9]+"
a[0] = a[uint8(v>>24)]
// ppc64x: "SRD", "CLRLSLDI", -"RLWNM"
a[1] = a[uint8(v>>25)]
// ppc64x: -"CLRLSLDI", "RLWNM\t[$]9, R[0-9]+, [$]23, [$]29, R[0-9]+"
a[2] = a[v>>25&0x7F]
// ppc64x: -"CLRLSLDI", "RLWNM\t[$]3, R[0-9]+, [$]29, [$]29, R[0-9]+"
a[3] = a[(v>>31)&0x01]
// ppc64x: -"CLRLSLDI", "RLWNM\t[$]12, R[0-9]+, [$]21, [$]28, R[0-9]+"
b[0] = b[uint8(v>>23)]
// ppc64x: -"CLRLSLDI", "RLWNM\t[$]15, R[0-9]+, [$]21, [$]28, R[0-9]+"
b[1] = b[(v>>20)&0xFF]
// ppc64x: "RLWNM", -"SLD"
b[2] = b[((uint64((uint32(v) >> 21)) & 0x3f) << 4)]
// ppc64x: "RLWNM\t[$]11, R[0-9]+, [$]10, [$]15"
c[0] = c[((v>>5)&0x3F)<<16]
// ppc64x: "ANDCC\t[$]8064,"
c[1] = c[((v>>7)&0x3F)<<7]
}
func checkShiftMask(a uint32, b uint64, z []uint32, y []uint64) {
_ = y[128]
_ = z[128]
// ppc64x: -"MOVBZ", -"SRW", "RLWNM"
z[0] = uint32(uint8(a >> 5))
// ppc64x: -"MOVBZ", -"SRW", "RLWNM"
z[1] = uint32(uint8((a >> 4) & 0x7e))
// ppc64x: "RLWNM\t[$]25, R[0-9]+, [$]27, [$]29, R[0-9]+"
z[2] = uint32(uint8(a>>7)) & 0x1c
// ppc64x: -"MOVWZ"
y[0] = uint64((a >> 6) & 0x1c)
// ppc64x: -"MOVWZ"
y[1] = uint64(uint32(b)<<6) + 1
// ppc64x: -"MOVHZ", -"MOVWZ"
y[2] = uint64((uint16(a) >> 9) & 0x1F)
// ppc64x: -"MOVHZ", -"MOVWZ", -"ANDCC"
y[3] = uint64(((uint16(a) & 0xFF0) >> 9) & 0x1F)
}
// 128 bit shifts
func check128bitShifts(x, y uint64, bits uint) (uint64, uint64) {
s := bits & 63
ŝ := (64 - bits) & 63
// check that the shift operation has two commas (three operands)
// amd64:"SHRQ.*,.*,"
shr := x>>s | y<<ŝ
// amd64:"SHLQ.*,.*,"
shl := x<<s | y>>ŝ
return shr, shl
}
func checkShiftToMask(u []uint64, s []int64) {
// amd64:-"SHR",-"SHL","ANDQ"
u[0] = u[0] >> 5 << 5
// amd64:-"SAR",-"SHL","ANDQ"
s[0] = s[0] >> 5 << 5
// amd64:-"SHR",-"SHL","ANDQ"
u[1] = u[1] << 5 >> 5
}
//
// Left shift with addition.
//
func checkLeftShiftWithAddition(a int64, b int64) int64 {
// riscv64/rva20u64: "SLLI","ADD"
// riscv64/rva22u64: "SH1ADD"
a = a + b<<1
// riscv64/rva20u64: "SLLI","ADD"
// riscv64/rva22u64: "SH2ADD"
a = a + b<<2
// riscv64/rva20u64: "SLLI","ADD"
// riscv64/rva22u64: "SH3ADD"
a = a + b<<3
return a
}
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