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runtime: don't use duffcopy on Plan 9

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In CL 14836, the implementation of duffcopy on amd64
was changed to replace the use of the MOVQ instructions
by MOVUPS.

However, it broke the build on plan9/amd64, since
Plan 9 doesn't allow floating point in note handler.

This change disables the use of duffcopy on Plan 9.

Fixes #12829.

Change-Id: Ifd5b17b17977a1b631b16c3dfe2dc7ab4ad00507
Reviewed-on: https://go-review.googlesource.com/15421
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
David du Colombier 2015-10-05 23:16:51 +02:00
parent e4add8d569
commit 50ad337238
1 changed files with 1 additions and 1 deletions
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2
src/cmd/compile/internal/amd64/cgen.go
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@ -80,7 +80,7 @@ func blockcopy(n, ns *gc.Node, osrc, odst, w int64) {
gins(x86.ACLD, nil, nil)
} else {
// normal direction
if q > 128 || (gc.Nacl && q >= 4) {
if q > 128 || (gc.Nacl && q >= 4) || (obj.Getgoos() == "plan9" && q >= 4) {
gconreg(movptr, q, x86.REG_CX)
gins(x86.AREP, nil, nil) // repeat
gins(x86.AMOVSQ, nil, nil) // MOVQ *(SI)+,*(DI)+