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cmd/compile: internal compiler error: not lowered: v46, Load ARRAY PTR64 SSA #26120

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ALTree opened this issue Jun 28, 2018 · 2 comments
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cmd/compile: internal compiler error: not lowered: v46, Load ARRAY PTR64 SSA #26120

ALTree opened this issue Jun 28, 2018 · 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
Milestone
Go1.11

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@ALTree
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ALTree commented Jun 28, 2018 

$ gotip version
go version devel +c07f2b0099 Thu Jun 28 17:46:02 2018 +0000 linux/amd64

The following program (reduced from a gosmith-generated one):

package p

type T [1]struct {
	f    []int
	i, j int
}

func F() {
	var v T
	f := func() T {
		return v
	}
	_ = []int{}[f()[0].i]
}

crashes the tip compiler with the following error:

$ gotip build crash.go 
# command-line-arguments
./crash.go:13:18: internal compiler error: not lowered: v46, Load ARRAY PTR64 SSA

goroutine 8 [running]:
runtime/debug.Stack(0x0, 0x0, 0x0)
	/home/alberto/go/src/runtime/debug/stack.go:24 +0xa7
cmd/compile/internal/gc.Fatalf(0xca3be5, 0x2, 0xc0004fc0e0, 0x1, 0x1)
	/home/alberto/go/src/cmd/compile/internal/gc/subr.go:182 +0x1f7
cmd/compile/internal/gc.(*ssafn).Fatalf(0xc0004c8000, 0xd12000000002, 0xca3be5, 0x2, 0xc0004fc0e0, 0x1, 0x1)
	/home/alberto/go/src/cmd/compile/internal/gc/ssa.go:5583 +0x67
cmd/compile/internal/ssa.(*Func).Fatalf(0xc0004cc000, 0xca3be5, 0x2, 0xc0004fc0e0, 0x1, 0x1)
	/home/alberto/go/src/cmd/compile/internal/ssa/func.go:562 +0x73
cmd/compile/internal/ssa.checkLower(0xc0004cc000)
	/home/alberto/go/src/cmd/compile/internal/ssa/lower.go:36 +0x34d
cmd/compile/internal/ssa.Compile(0xc0004cc000)
	/home/alberto/go/src/cmd/compile/internal/ssa/compile.go:70 +0x30e
cmd/compile/internal/gc.buildssa(0xc00035e000, 0x1, 0x0)
	/home/alberto/go/src/cmd/compile/internal/gc/ssa.go:211 +0xaa7
cmd/compile/internal/gc.compileSSA(0xc00035e000, 0x1)
	/home/alberto/go/src/cmd/compile/internal/gc/pgen.go:259 +0x39
cmd/compile/internal/gc.compileFunctions.func2(0xc0004bab40, 0xc0000166c0, 0x1)
	/home/alberto/go/src/cmd/compile/internal/gc/pgen.go:323 +0x49
created by cmd/compile/internal/gc.compileFunctions
	/home/alberto/go/src/cmd/compile/internal/gc/pgen.go:321 +0x11a

It compiles fine on go1.10.
@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 Jun 28, 2018
@ALTree ALTree added this to the Go1.11 milestone Jun 28, 2018
@ALTree
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ALTree commented Jun 28, 2018

I'm too sleepy to bisect so cc-ing at random @randall77 @dr2chase @cherrymui

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Change https://golang.org/cl/121496 mentions this issue: cmd/compile: check SSAability in handling of INDEX of 1-element array

@golang golang locked and limited conversation to collaborators Jun 29, 2019
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