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Re: [PATCH] libgo: fix support for ia64


On Tue, Jun 6, 2017 at 6:11 AM, Andreas Schwab <schwab@suse.de> wrote:
> This adds support for ia64 in lfstack.

Thanks.

Committed to mainline.

Ian


> diff --git a/libgo/go/runtime/lfstack_64bit.go b/libgo/go/runtime/lfstack_64bit.go
> index b314a3ba21..99dcec02de 100644
> --- a/libgo/go/runtime/lfstack_64bit.go
> +++ b/libgo/go/runtime/lfstack_64bit.go
> @@ -2,7 +2,7 @@
>  // Use of this source code is governed by a BSD-style
>  // license that can be found in the LICENSE file.
>
> -// +build amd64 arm64 mips64 mips64le ppc64 ppc64le s390x arm64be alpha mipsn64 sparc64
> +// +build amd64 arm64 mips64 mips64le ppc64 ppc64le s390x arm64be alpha mipsn64 sparc64 ia64
>
>  package runtime
>
> @@ -38,12 +38,22 @@ const (
>         // room in the bottom for the count.
>         sparcLinuxAddrBits = 52
>         sparcLinuxCntBits  = 64 - sparcLinuxAddrBits + 3
> +
> +       // On IA64, the virtual address space is devided into 8 regions, with
> +       // 52 address bits each (with 64k page size).
> +       ia64AddrBits = 55
> +       ia64CntBits = 64 - ia64AddrBits + 3
>  )
>
>  func lfstackPack(node *lfnode, cnt uintptr) uint64 {
>         if GOARCH == "sparc64" && GOOS == "linux" {
>                 return uint64(uintptr(unsafe.Pointer(node)))<<(64-sparcLinuxAddrBits) | uint64(cnt&(1<<sparcLinuxCntBits-1))
>         }
> +       if GOARCH == "ia64" {
> +               // Top three bits are the region number
> +               val := uint64(uintptr(unsafe.Pointer(node)))
> +               return (val<<(64-ia64AddrBits))&(1<<(64-3)-1) | val&^(1<<(64-3)-1) | uint64(cnt&(1<<ia64CntBits-1))
> +       }
>         return uint64(uintptr(unsafe.Pointer(node)))<<(64-addrBits) | uint64(cnt&(1<<cntBits-1))
>  }
>
> @@ -56,5 +66,8 @@ func lfstackUnpack(val uint64) *lfnode {
>         if GOARCH == "sparc64" && GOOS == "linux" {
>                 return (*lfnode)(unsafe.Pointer(uintptr(int64(val) >> sparcLinuxCntBits << 3)))
>         }
> +       if GOARCH == "ia64" {
> +               return (*lfnode)(unsafe.Pointer(uintptr((val >> ia64CntBits << 3)&(1<<(64-3)-1) | val&^(1<<(64-3)-1))))
> +       }
>         return (*lfnode)(unsafe.Pointer(uintptr(val >> cntBits << 3)))
>  }
> --


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