cmd/internal/obj/arm64: golang assembler handles arm64 instruction fcsels/fcseld incorrectly. #21582
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Change https://golang.org/cl/58350 mentions this issue: |
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Please answer these questions before submitting your issue. Thanks!
What version of Go are you using (
go version)?go version devel +8bd9b61 Thu Aug 24 01:27:16 2017 +0000 linux/arm64
Does this issue reproduce with the latest release?
yes
What operating system and processor architecture are you using (
go env)?GOARCH="arm64"
GOBIN=""
GOEXE=""
GOHOSTARCH="arm64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/home/fanzha02/go"
GORACE=""
GOROOT="/mnt/share/homes/fanzha02/push/asmforus/golang"
GOTOOLDIR="/mnt/share/homes/fanzha02/push/asmforus/golang/pkg/tool/linux_arm64"
GCCGO="gccgo"
CC="gcc"
GOGCCFLAGS="-fPIC -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build168484330=/tmp/go-build -gno-record-gcc-switches"
CXX="g++"
CGO_ENABLED="1"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
What did you do?
cd src/cmd/asm/internal/asm
vi testdate/arm64enc.s
uncomment MSR/MRS test cases
go test -run "ARM64Encoder"
If possible, provide a recipe for reproducing the error.
A complete runnable program is good.
A link on play.golang.org is best.
What did you expect to see?
go test successfully
What did you see instead?
I saw the error information as below.
illegal combination 01248 (testdata/arm64enc.s:409) FCSELS EQ, F26, F27, F25 COND FREG FREG, 7 7
illegal combination 01252 (testdata/arm64enc.s:410) FCSELD PL, F8, F22, F7 COND FREG FREG, 7 7
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