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cmd/compile: inconsistent conversion from float64 to uint64(aarch64) #65127

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qsliu2017 opened this issue Jan 17, 2024 · 1 comment
Closed

cmd/compile: inconsistent conversion from float64 to uint64(aarch64) #65127

qsliu2017 opened this issue Jan 17, 2024 · 1 comment
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compiler/runtime Issues related to the Go compiler and/or runtime.

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@qsliu2017
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Go version

go version go1.21.0 darwin/arm64

Output of go env in your module/workspace:

GO111MODULE=''
GOARCH='arm64'
GOBIN=''
GOCACHE='~/Library/Caches/go-build'
GOENV='~/Library/Application Support/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='arm64'
GOHOSTOS='darwin'
GOINSECURE=''
GOMODCACHE='~/go/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='darwin'
GOPATH='~/go'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/opt/homebrew/Cellar/go/1.21.0/libexec'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/opt/homebrew/Cellar/go/1.21.0/libexec/pkg/tool/darwin_arm64'
GOVCS=''
GOVERSION='go1.21.0'
GCCGO='gccgo'
AR='ar'
CC='cc'
CXX='c++'
CGO_ENABLED='1'
GOMOD=''
GOWORK=''
CGO_CFLAGS='-O2 -g -I/usr/homebrew/include'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
PKG_CONFIG='pkg-config'
GOGCCFLAGS='-fPIC -arch arm64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -ffile-prefix-map=/var/folders/3y/dftsj5j92kqdstnn5yjzzw1w0000gp/T/go-build1268870237=/tmp/go-build -gno-record-gcc-switches -fno-common'

What did you do?

https://go.dev/play/p/YHU7X77AGqG

package main

import "fmt"

func Convert(x float64) uint64 {
	return uint64(x)
}

func main() {
	fmt.Println(Convert(-2.0))
}

What did you see happen?

0

What did you expect to see?

18446744073709551614
@gopherbot gopherbot added the compiler/runtime Issues related to the Go compiler and/or runtime. label Jan 17, 2024
@qsliu2017 qsliu2017 changed the title cmd/compile: inconsistent type conversion from float64 to uint64 in aarch64 cmd/compile: inconsistent conversion from float64 to uint64(aarch64) Jan 17, 2024
@randall77
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This is allowed by the spec. Results of out-of-range conversions are implementation-dependent. From https://go.dev/ref/spec#Conversions

In all non-constant conversions involving floating-point or complex values, if the result type cannot represent the value the conversion succeeds but the result value is implementation-dependent.

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@randall77 @gopherbot @qsliu2017