|author||Michael Hudson-Doyle <firstname.lastname@example.org>||Thu Apr 27 11:56:42 2017 +1200|
|committer||Russ Cox <email@example.com>||Fri Oct 20 12:42:12 2017 -0400|
[release-branch.go1.8] cmd/internal/obj/x86: use LEAx rather than ADDx when calling DUFFxxxx via GOT DUFFZERO on 386 is not marked as clobbering flags, but rewriteToUseGot rewrote "ADUFFZERO $offset" to "MOVL runtime.duffxxx@GOT, CX; ADDL $offset, CX; CALL CX" which does. Luckily the fix is easier than figuring out what the problem was: replace the ADDL $offset, CX with LEAL $offset(CX), CX. On amd64 DUFFZERO clobbers flags, on arm, arm64 and ppc64 ADD does not clobber flags and s390x does not use the duff functions, so I'm fairly confident this is the only fix required. I don't know how to write a test though. Change-Id: I69b0958f5f45771d61db5f5ecb4ded94e8960d4d Reviewed-on: https://go-review.googlesource.com/41821 Run-TryBot: Michael Hudson-Doyle <firstname.lastname@example.org> TryBot-Result: Gobot Gobot <email@example.com> Reviewed-by: Keith Randall <firstname.lastname@example.org>
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