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math: Different downcast behavior depending on platform #64444

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nseba opened this issue Nov 29, 2023 · 1 comment
Closed

math: Different downcast behavior depending on platform #64444

nseba opened this issue Nov 29, 2023 · 1 comment

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@nseba
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nseba commented Nov 29, 2023 •
edited

Go version

1.21

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

GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/opt/homebrew/opt/go/libexec'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/opt/homebrew/opt/go/libexec/pkg/tool/darwin_arm64'
GOVCS=''
GOVERSION='go1.21.4'
GCCGO='gccgo'
AR='ar'
CC='cc'
CXX='c++'
CGO_ENABLED='1'
GOMOD='/Users/seba/dev/logiccloud/rounding-test/go.mod'
GOWORK=''
CGO_CFLAGS='-O2 -g'
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/65/jfg8j9sn7jdftxk_ny295yvh0000gn/T/go-build2794130776=/tmp/go-build -gno-record-gcc-switches -fno-common'

What did you do?

Converting a float32 to an integer type has different behaviors on darwin/arm64 vs x86 when the float value overflows the target integer type. A sample project can be found here: https://go.dev/play/p/WZoGD3q1LBx

What did you expect to see?

darwin/arm64

float64 int8 uint8 uint64
3.4028234663852886e+38 -1 255 18446744073709551615
-3.4028234663852886e+38 0 0 0
256 0 0 256
-1.4 -1 255 0

What did you see instead?

linux/x86

float64 int8 uint8 uint64
3.4028234663852886e+38 0 0 9223372036854775808
-3.4028234663852886e+38 0 0 9223372036854775808
256 0 0 256
-1.4 -1 255 18446744073709551615
@seankhliao
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Duplicate of #19405

@seankhliao seankhliao marked this as a duplicate of #19405 Nov 29, 2023
@seankhliao seankhliao closed this as not planned Won't fix, can't repro, duplicate, stale Nov 29, 2023
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@nseba @seankhliao