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cmd/compile: internal compiler error: can't encode a NaN in AuxInt field #38359

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ALTree opened this issue Apr 10, 2020 · 2 comments
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cmd/compile: internal compiler error: can't encode a NaN in AuxInt field #38359

ALTree opened this issue Apr 10, 2020 · 2 comments
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FrozenDueToAge NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. release-blocker
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Go1.15

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@ALTree
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ALTree commented Apr 10, 2020 

$ gotip version
go version devel +782fcb44b9 Fri Apr 10 09:38:07 2020 +0000 linux/amd64

The following program:

package p

func f() {
	var st struct {
		f    float64
		_, _ string
	}

	f := 1e308
	st.f = 2*f - 2*f
}

crashes the tip compiler with this error:

$ gotip build crash.go

# command-line-arguments
./crash.go:11:1: internal compiler error: 'f': panic during opt while compiling f:

can't encode a NaN in AuxInt field

It compiles fine with Go 1.14.2.
@ALTree ALTree added NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. release-blocker labels Apr 10, 2020
@ALTree ALTree added this to the Go1.15 milestone Apr 10, 2020
@ALTree
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ALTree commented Apr 10, 2020

cc @randall77

@randall77 randall77 self-assigned this Apr 10, 2020
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Change https://golang.org/cl/227860 mentions this issue: cmd/compile: prevent constant folding of +/- when result is NaN

@golang golang locked and limited conversation to collaborators Apr 10, 2021
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