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cmd/compile: unexpected amd64 error #32701

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ghost opened this issue Jun 20, 2019 · 6 comments
Closed

cmd/compile: unexpected amd64 error #32701

ghost opened this issue Jun 20, 2019 · 6 comments
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@ghost
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ghost commented Jun 20, 2019

Some simple code went wrong (only) on amd64.

The following go code

func main() {
	b := []byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16}
	temp := make([]byte, 4)
	for i := int64(0);i<4; i ++ {
		temp[0] = b[i*4 + 2]
		temp[1] = b[i*4 + 3]
		temp[2] = b[i*4 + 0]
		temp[3] = b[i*4 + 1]
		n := binary.BigEndian.Uint32(temp)
		fmt.Printf("%x\n", n)
	}
}

is expected to print

3040102
7080506
b0c090a
f100d0e

That is true on arm/arm64/386, but false on amd64.

apuser@tj07598pcu:~/Desktop$ GOARCH=arm go run main.go 
3040102
7080506
b0c090a
f100d0e
apuser@tj07598pcu:~/Desktop$ GOARCH=386 go run main.go 
3040102
7080506
b0c090a
f100d0e
apuser@tj07598pcu:~/Desktop$ GOARCH=amd64 go run main.go 
3040000
7080102
b0c0506
f10090a
apuser@tj07598pcu:~/Desktop$ GOARCH=arm64 go run main.go 
3040102
7080506
b0c090a	
f100d0e
apuser@tj07598pcu:~/Desktop$ go version
go version devel +71a6a44428 Wed Jun 19 23:17:25 2019 +0000 linux/amd64
@zboya
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zboya commented Jun 20, 2019

the same code!

go version
go version go1.12.5 darwin/amd64

go run main.go              
3040000
7080102
b0c0506
f10090a

go run -gcflags '-N' main.go
3040102
7080506
b0c090a
f100d0e

@av86743
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av86743 commented Jun 20, 2019

@beenshi: What do you use to run arm/arm64 transparently on linux/amd64?

That is true on arm/arm64/386, but false on amd64.

apuser@tj07598pcu:~/Desktop$ GOARCH=arm go run main.go 
3040102
7080506
b0c090a
f100d0e
apuser@tj07598pcu:~/Desktop$ GOARCH=386 go run main.go 
3040102
7080506
b0c090a
f100d0e
apuser@tj07598pcu:~/Desktop$ GOARCH=amd64 go run main.go 
3040000
7080102
b0c0506
f10090a
apuser@tj07598pcu:~/Desktop$ GOARCH=arm64 go run main.go 
3040102
7080506
b0c090a	
f100d0e
apuser@tj07598pcu:~/Desktop$ go version
go version devel +71a6a44428 Wed Jun 19 23:17:25 2019 +0000 linux/amd64

@ghost
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ghost commented Jun 20, 2019

@av86743

ubuntu 18.04
apt-get install qemu -y

@cherrymui
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Seems a dup of #32680?

@cherrymui
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cc @dr2chase

@dr2chase
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Dupe of #32680. (It at least shares the same fix.)

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@av86743 @dr2chase @gopherbot @zboya @cherrymui