bytes: comparing long byte slices on s390x gives incorrect results #26114
Description
Please answer these questions before submitting your issue. Thanks!
What version of Go are you using (go version)?
master tip, plus 1.10, 1.9, 1.8, etc
Does this issue reproduce with the latest release?
yes
What operating system and processor architecture are you using (go env)?
GOARCH="s390x"
GOBIN=""
GOEXE=""
GOHOSTARCH="s390x"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/gsa/tlbgsa/home/b/i/billo/work"
GORACE=""
GOROOT="/sandbox/billo/master/go"
GOTOOLDIR="/sandbox/billo/master/go/pkg/tool/linux_s390x"
GCCGO="gccgo"
CC="s390x-linux-gnu-gcc"
GOGCCFLAGS="-fPIC -m64 -march=z196 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build416940965=/tmp/go-build -gno-record-gcc-switches"
CXX="g++"
CGO_ENABLED="1"
PKG_CONFIG="pkg-config"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
What did you do?
https://play.golang.org/p/A_j0ONgu6hS
What did you expect to see?
-1
What did you see instead?
0
This showed up in a leveldb application. I have a fix -- will submit the CL shortly. Also hoping for a backport to 1.10 and 1.9 if possible.