cmd/compile: "offset too large" error

[mei-rune]

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

go version go1.9 windows/amd64

Does this issue reproduce with the latest release?

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

go env
set GOARCH=amd64
set GOBIN=
set GOEXE=.exe
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GOOS=windows
set GOPATH=d:\dev\go\meijing;d:\dev\tpt_vendor;d:\dev\Godeps_workspace
set GORACE=
set GOROOT=d:\tools\go_amd64
set GOTOOLDIR=d:\tools\go_amd64\pkg\tool\windows_amd64
set GCCGO=gccgo
set CC=gcc
set GOGCCFLAGS=-m64 -mthreads -fmessage-length=0 -fdebug-prefix-map=C:\Users\xxxx\AppData\Local\Temp\go-build851261075=/tmp/go-build -gno-record-gcc-switches
set CXX=g++
set CGO_ENABLED=1
set CGO_CFLAGS=-g -O2
set CGO_CPPFLAGS=
set CGO_CXXFLAGS=-g -O2
set CGO_FFLAGS=-g -O2
set CGO_LDFLAGS=-g -O2
set PKG_CONFIG=pkg-config

What did you do?

I compile my app, it is ok on go1.8 or go1.7
code is:

What did you expect to see?

it is compile ok.

What did you see instead?

cn/com/hengwei/poller

.\alert_action.go:448:2: offset too large in 02217 (d:\dev\meijing\src\cn\com\hengwei\poller\alert_action.go:428) MOVQ -17179868768(BX)(AX8),BX
.\alert_action.go:448:2: offset too large in 03783 (d:\dev\meijing\src\cn\com\hengwei\poller\alert_action.go:430) MOVQ -17179868768(DX)(CX8),DX
FAIL cn/com/hengwei/poller [build failed]

[dsnet]

Hi. We're going to need something more than a screenshot to help debug this. At least paste a minimal reproduction of the problem.

\cc @randall77 @josharian

[mei-rune]

@dsnet this code is private, if you can promise not to spread it, nor use it elsewhere, and delete it after finding out the problem, I can send this code to your mail.

[dsnet]

Please don't send me anything. I have reported on compiler bugs before. You should be able to use process of elimination to eventually trim the problem down to a snippet that is safe to share. For example, #20333.

[mei-rune]

package abc

import (
	"math"
)

const current_status_internal_start = math.MaxInt32 - 50

func gen_message(ss []*string, current int) string {
	s := ss[current-current_status_internal_start]
	if nil != s {
		return ""
	}

	switch current {
	case 0:
		return "a"
	default:
		return "b"
	}
}

main.zip

D:\developing\go\meijing\src\abc>go build
# abc
.\main.go:15:2: offset too large in 00039 (d:\developing\go\meijing\src\abc\main.go:10) MOVQ    -17179868776(CX)(AX*8), CX

it is ok on the linux.

it is ok on the linux.

It's not, on my machine.

$ go build 
# github.com/opennota/a
./main.go:15:2: offset too large in 00039 (/home/opennota/gocode/src/github.com/opennota/a/main.go:10)       MOVQ    -17179868776(CX)(AX*8), CX

$ go version
go version go1.9 linux/amd64

$ go env
GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/home/opennota/gocode"
GORACE=""
GOROOT="/home/opennota/go"
GOTOOLDIR="/home/opennota/go/pkg/tool/linux_amd64"
GCCGO="gccgo"
CC="gcc"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build906297495=/tmp/go-build -gno-record-gcc-switches"
CXX="g++"
CGO_ENABLED="1"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"

[mei-rune]

@opennota yes, I made a mistake, it is fail also on the linux.

[dsnet]

@runner-mei, thank you for producing a minimal repro.

[gopherbot]

Change https://golang.org/cl/59630 mentions this issue: cmd/compile: avoid generating large offsets