cmd/compile: internal compiler error: got untyped bool for autotmp

Please answer these questions before submitting your issue. Thanks!

What version of Go are you using (`go version`)?

go version devel +eb15cf1 Sat Oct 22 01:23:14 2016 +0000 darwin/amd64

What operating system and processor architecture are you using (`go env`)?

GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/mateusz.gajewski/Desktop/Projects/"
GORACE=""
GOROOT="/usr/local/Cellar/go/HEAD-eb15cf1/libexec"
GOTOOLDIR="/usr/local/Cellar/go/HEAD-eb15cf1/libexec/pkg/tool/darwin_amd64"
GCCGO="gccgo"
CC="clang"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/43/1y0rrqr55zq3f8cj5wpkt1kmhc7r33/T/go-build002271164=/tmp/go-build -gno-record-gcc-switches -fno-common"
CXX="clang++"
CGO_ENABLED="1"
PKG_CONFIG="pkg-config"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"

What did you do?

This is minimal example I've been able to create to reproduce this error (works in go 1.7.3):

package main
import "fmt"

func main() {
        _, x := X()
        fmt.Printf("x = %v\n", x)
}

func X() (i int, ok bool) {
        ii := int(1)
        return ii, 0 <= ii && ii <= 0x7fffffff
}

What did you expect to see?

x = true

What did you see instead?

./main.go:11: internal compiler error: got untyped bool for autotmp_7

goroutine 1 [running]:
runtime/debug.Stack(0x0, 0x0, 0x0)
    /usr/local/Cellar/go/HEAD-eb15cf1/libexec/src/runtime/debug/stack.go:24 +0x79
cmd/compile/internal/gc.Fatalf(0x644878, 0xd, 0xc42039b580, 0x2, 0x2)
    /usr/local/Cellar/go/HEAD-eb15cf1/libexec/src/cmd/compile/internal/gc/subr.go:165 +0x226
cmd/compile/internal/gc.typecheckdef(0xc420408b40, 0xc420097140)
    /usr/local/Cellar/go/HEAD-eb15cf1/libexec/src/cmd/compile/internal/gc/typecheck.go:3779 +0x3e6
cmd/compile/internal/gc.typecheck1(0xc420408b40, 0x22, 0x0)
    /usr/local/Cellar/go/HEAD-eb15cf1/libexec/src/cmd/compile/internal/gc/typecheck.go:266 +0xca51
cmd/compile/internal/gc.typecheck(0xc420408b40, 0x22, 0xc42039c558)
    /usr/local/Cellar/go/HEAD-eb15cf1/libexec/src/cmd/compile/internal/gc/typecheck.go:188 +0x602
cmd/compile/internal/gc.typecheckas(0xc420408bd0)
    /usr/local/Cellar/go/HEAD-eb15cf1/libexec/src/cmd/compile/internal/gc/typecheck.go:3253 +0x78
cmd/compile/internal/gc.typecheck1(0xc420408bd0, 0x1, 0x690898)
    /usr/local/Cellar/go/HEAD-eb15cf1/libexec/src/cmd/compile/internal/gc/typecheck.go:1963 +0x37ce
cmd/compile/internal/gc.typecheck(0xc420408bd0, 0x1, 0xc420408a20)
    /usr/local/Cellar/go/HEAD-eb15cf1/libexec/src/cmd/compile/internal/gc/typecheck.go:188 +0x602
cmd/compile/internal/gc.copyexpr(0xc420408a20, 0xc420096840, 0xc42038db10, 0x10)
    /usr/local/Cellar/go/HEAD-eb15cf1/libexec/src/cmd/compile/internal/gc/subr.go:1336 +0x68
cmd/compile/internal/gc.cheapexpr(0xc420408a20, 0xc42038db10, 0x10)
    /usr/local/Cellar/go/HEAD-eb15cf1/libexec/src/cmd/compile/internal/gc/subr.go:1350 +0x5d
cmd/compile/internal/gc.safeexpr(0xc420408a20, 0xc42038db10, 0xc42038d0e0)
    /usr/local/Cellar/go/HEAD-eb15cf1/libexec/src/cmd/compile/internal/gc/subr.go:1330 +0x1fd
cmd/compile/internal/gc.walkexprlistsafe(0xc42007cef0, 0x2, 0x2, 0xc42038db10)
    /usr/local/Cellar/go/HEAD-eb15cf1/libexec/src/cmd/compile/internal/gc/walk.go:401 +0x56
cmd/compile/internal/gc.walkstmt(0xc42038db00, 0xc42038d9e0)
    /usr/local/Cellar/go/HEAD-eb15cf1/libexec/src/cmd/compile/internal/gc/walk.go:337 +0x478
cmd/compile/internal/gc.walkstmtlist(0xc420385f80, 0x5, 0x8)
    /usr/local/Cellar/go/HEAD-eb15cf1/libexec/src/cmd/compile/internal/gc/walk.go:80 +0x44
cmd/compile/internal/gc.walk(0xc42038cbd0)
    /usr/local/Cellar/go/HEAD-eb15cf1/libexec/src/cmd/compile/internal/gc/walk.go:65 +0x1c0
cmd/compile/internal/gc.compile(0xc42038cbd0)
    /usr/local/Cellar/go/HEAD-eb15cf1/libexec/src/cmd/compile/internal/gc/pgen.go:347 +0x1c5
cmd/compile/internal/gc.funccompile(0xc42038cbd0)
    /usr/local/Cellar/go/HEAD-eb15cf1/libexec/src/cmd/compile/internal/gc/dcl.go:1303 +0xdc
cmd/compile/internal/gc.Main()
    /usr/local/Cellar/go/HEAD-eb15cf1/libexec/src/cmd/compile/internal/gc/main.go:476 +0x1f50
main.main()
    /usr/local/Cellar/go/HEAD-eb15cf1/libexec/src/cmd/compile/main.go:47 +0x15d

Works with:

explicit type: return ii, bool(0 <= ii && ii <= 0x7fffffff)
X signature: func X() (int, bool)

This appears to be a side-effect of 6286188.

@randall77

CC @randall77 @josharian

Thanks for the concise test case. In my (somewhat long) queue.

@josharian

@josharian I had to extract it from the code I've been working on. Glad to be able to help :)

Interestingly the bug only manifests with a named return signature
ie this works alright the difference being:

6c6
< func Y() (int, bool) {
---
> func Y() (i int, ok bool) {

Passes

package main
func main() {
        _, y := Y()
        if y {}
}
func Y() (int, bool) { 
        ii := int(1)
        return ii, 0 <= ii && ii < 20
}

Fails

package main

func main() {
    _, _ = Y()
}
func Y() (i int, ok bool) {
    ii := int(1)
    return ii, 0 <= ii && ii < 20
}

./fails.go:8: internal compiler error: got untyped bool for autotmp_2

goroutine 1 [running]:
runtime/debug.Stack(0x0, 0x0, 0x0)
    /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/runtime/debug/stack.go:24 +0x79
cmd/compile/internal/gc.Fatalf(0x644b18, 0xd, 0xc42031d540, 0x2, 0x2)
    /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/cmd/compile/internal/gc/subr.go:165 +0x226
cmd/compile/internal/gc.typecheckdef(0xc4203655f0, 0xc42031d640)
    /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/cmd/compile/internal/gc/typecheck.go:3782 +0x488
cmd/compile/internal/gc.typecheck1(0xc4203655f0, 0x22, 0xc420356520)
    /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/cmd/compile/internal/gc/typecheck.go:266 +0xca51
cmd/compile/internal/gc.typecheck(0xc4203655f0, 0x22, 0x4e7e9f)
    /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/cmd/compile/internal/gc/typecheck.go:188 +0x602
cmd/compile/internal/gc.typecheckas(0xc420365680)
    /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/cmd/compile/internal/gc/typecheck.go:3253 +0x78
cmd/compile/internal/gc.typecheck1(0xc420365680, 0x1, 0x690bf4)
    /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/cmd/compile/internal/gc/typecheck.go:1963 +0x37ce
cmd/compile/internal/gc.typecheck(0xc420365680, 0x1, 0xc4203654d0)
    /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/cmd/compile/internal/gc/typecheck.go:188 +0x602
cmd/compile/internal/gc.copyexpr(0xc4203654d0, 0xc4200189c0, 0xc4203566d0, 0x10)
    /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/cmd/compile/internal/gc/subr.go:1336 +0x68
cmd/compile/internal/gc.cheapexpr(0xc4203654d0, 0xc4203566d0, 0x10)
    /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/cmd/compile/internal/gc/subr.go:1350 +0x5d
cmd/compile/internal/gc.safeexpr(0xc4203654d0, 0xc4203566d0, 0xc420349dd0)
    /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/cmd/compile/internal/gc/subr.go:1330 +0x1fd
cmd/compile/internal/gc.walkexprlistsafe(0xc420012c80, 0x2, 0x2, 0xc4203566d0)
    /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/cmd/compile/internal/gc/walk.go:401 +0x56
cmd/compile/internal/gc.walkstmt(0xc4203566c0, 0xc4203565a0)
    /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/cmd/compile/internal/gc/walk.go:337 +0x478
cmd/compile/internal/gc.walkstmtlist(0xc420335600, 0x5, 0x8)
    /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/cmd/compile/internal/gc/walk.go:80 +0x44
cmd/compile/internal/gc.walk(0xc4203498c0)
    /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/cmd/compile/internal/gc/walk.go:65 +0x1c0
cmd/compile/internal/gc.compile(0xc4203498c0)
    /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/cmd/compile/internal/gc/pgen.go:347 +0x1c5
cmd/compile/internal/gc.funccompile(0xc4203498c0)
    /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/cmd/compile/internal/gc/dcl.go:1303 +0xdc
cmd/compile/internal/gc.Main()
    /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/cmd/compile/internal/gc/main.go:476 +0x1f50
main.main()
    /Users/emmanuelodeke/go/src/go.googlesource.com/go/src/cmd/compile/main.go:47 +0x15d

@odeke-em

@odeke-em yeah, I mentioned it in the issue. Error does not occur when there is single named bool returned.

Also, these combinations will work:

return 0 <= 1 && ii <= 0x7fffffff, ii
return 0 <= ii && 1 <= 0x7fffffff, ii
return 0 <= 1 && 0 <= 0x7fffffff, ii

So probably as @0xmohit mentioned it's a side effect of optimization introduced in 6286188

CL https://golang.org/cl/31857 mentions this issue.

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cmd/compile: internal compiler error: got untyped bool for autotmp #17551

What version of Go are you using (`go version`)?

What operating system and processor architecture are you using (`go env`)?

What did you do?

What did you expect to see?

What did you see instead?

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cmd/compile: internal compiler error: got untyped bool for autotmp #17551

Description

What version of Go are you using (go version)?

What operating system and processor architecture are you using (go env)?

What did you do?

What did you expect to see?

What did you see instead?

Activity

0xmohit commented on Oct 22, 2016

ianlancetaylor commented on Oct 22, 2016

josharian commented on Oct 22, 2016

wendigo commented on Oct 22, 2016

odeke-em commented on Oct 23, 2016

Passes

Fails

wendigo commented on Oct 23, 2016

gopherbot commented on Oct 24, 2016

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What version of Go are you using (`go version`)?

What operating system and processor architecture are you using (`go env`)?