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cmd/compile: internal compiler error: 'main': not lowered #31315

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ericlagergren opened this issue Apr 7, 2019 · 3 comments

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@ericlagergren
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commented Apr 7, 2019

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

1.12.2 (occurs with 1.12 and 1.12.1).

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

darwin/amd64

go env Output
$ go env
GOARCH="amd64"
GOBIN="/Users/ericlagergren/gopath/bin"
GOCACHE="/Users/ericlagergren/Library/Caches/go-build"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/ericlagergren/gopath"
GOPROXY=""
GORACE=""
GOROOT="/usr/local/go"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
GCCGO="gccgo"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD="/dev/null"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/vp/6n5tkzt93_7cb22vrc0qd08r0000gn/T/go-build366116268=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

$ cat x.go
package main

import (
	"fmt"
	"math/bits"
)

func main() {
	fmt.Println(bits.Sub(4, 100, 0))
}

The bug is a bit different on the playground:

https://play.golang.org/p/UmLdx0JeZHN

What did you expect to see?

18446744073709551520 1

What did you see instead?

# command-line-arguments
<unknown line number>: internal compiler error: 'main': not lowered: v19, Store SSA PTR UINT64 SSA

Please file a bug report including a short program that triggers the error.
https://golang.org/issue/new
@ericlagergren

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commented Apr 7, 2019

These does not reproduce the error:

func main() {
	x, c := bits.Sub(4, 100, 0)
	fmt.Println(x, c)
}

func main() {
	fmt.Println(bits.OnesCount(4))
}

func main() {
	fmt.Println(MySub(4, 100, 0)) // MySub is a copy + pasted bits.Sub
}
@agnivade

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commented Apr 7, 2019

Seems to be fixed at tip. Can you confirm ?

@ericlagergren

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commented Apr 7, 2019

Yup. Sorry, I thought it sounded like another issue (dupe) I'd read before, but couldn't find one that was similar enough.

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