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cmd/objdump: does not decode VPUNPCK* AVX2 instructions #55061

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Jorropo opened this issue Sep 14, 2022 · 2 comments
Closed

cmd/objdump: does not decode VPUNPCK* AVX2 instructions #55061

Jorropo opened this issue Sep 14, 2022 · 2 comments
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@randall77
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compiler/runtime Issues related to the Go compiler and/or runtime. FrozenDueToAge help wanted NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one.
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@Jorropo
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Jorropo commented Sep 14, 2022

What version of Go are you using (go version)?

$ go version
go version devel go1.20-a813be86df Tue Sep 13 17:43:40 2022 +0000 linux/amd64

Does this issue reproduce with the latest release?

Yes

What operating system and processor architecture are you using (go env)?

go env Output
$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/hugo/.cache/go-build"
GOENV="/home/hugo/.config/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/home/hugo/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/home/hugo/go"
GOPRIVATE=""
GOPROXY="direct"
GOROOT="/home/hugo/Documents/Scripts/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/home/hugo/Documents/Scripts/go/pkg/tool/linux_amd64"
GOVCS=""
GOVERSION="devel go1.20-a813be86df Tue Sep 13 17:43:40 2022 +0000"
GCCGO="gccgo"
GOAMD64="v3"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="/dev/null"
GOWORK=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build2806241209=/tmp/go-build -gno-record-gcc-switches"

What did you do?

go/src$ go tool asm cmd/asm/internal/asm/testdata/amd64enc.s
go/src$ go tool objdump amd64enc.o | grep amd64enc.s:9975

What did you expect to see?

  amd64enc.s:9975	0x12088			c4e1316813		VPUNPCKHBW (BX), X9, X2

What did you see instead?

  amd64enc.s:9975	0x12088			b168			MOVL $0x68, CL				
  amd64enc.s:9975	0x1208a			13c4			ADCL SP, AX
@gopherbot gopherbot added the compiler/runtime Issues related to the Go compiler and/or runtime. label Sep 14, 2022
@wdvxdr1123
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Seems duplicate of #48584

@toothrot toothrot added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label Sep 14, 2022
@toothrot toothrot added this to the Backlog milestone Sep 14, 2022
@randall77
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This is definitely a duplicate, at least in spirit, of #48584. The x86 disassembler needs some modernization. I'll close this issue in favor of that other one, but anyone fixing the disassembler should consider the examples in both issues.

@golang golang locked and limited conversation to collaborators Sep 28, 2023
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@randall77 randall77

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@toothrot @mknyszek @randall77 @gopherbot @Jorropo @wdvxdr1123