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cmd/compile: compilation fail due to unhandled unaligned offset on ARM64 #21992

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cherrymui opened this issue Sep 23, 2017 · 2 comments

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commented Sep 23, 2017

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

tip (5993a75)

Compile the following program on ARM64,

package p

type T struct {
        a [257]byte
        b [2]byte
}

func f(x *T) {
        x.b = [2]byte{}
}
$ GOARCH=arm64 GOOS=linux go tool compile /tmp/x.go 
/tmp/x.go:9:6: offset out of range: 257
00020 (/tmp/x.go:9)	MOVH	ZR, 257(R0)

CL 42172 handled large unaligned offset, but did not cover (or mis-handled) unaligned offset between 256 and 512. I'll make a CL to fix.

@cherrymui cherrymui self-assigned this Sep 23, 2017

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commented Sep 23, 2017

Take another look, this is a regression from CL https://go-review.googlesource.com/c/go/+/55610. Before this CL, C_PPAUTO and C_PPOREG only match multiple of 8, so the alignment is satisfied. That CL changes C_PPAUTO and C_PPOREG to match anything between 0 and 504.

@williamweixiao

@cherrymui cherrymui added this to the Go1.10 milestone Sep 23, 2017

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commented Sep 23, 2017

Change https://golang.org/cl/65730 mentions this issue: cmd/internal/obj/arm64: fix handling of unaligned offset between 256 and 504

@gopherbot gopherbot closed this in a92a77c Oct 5, 2017

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