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cmd/compile: internal compiler error when building golang.org/x/text/internal/number at tip #41846

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bcmills opened this issue Oct 7, 2020 · 2 comments
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cmd/compile: internal compiler error when building golang.org/x/text/internal/number at tip #41846

bcmills opened this issue Oct 7, 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 Soon This needs action soon. (recent regressions, service outages, unusual time-sensitive situations)
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Go1.16

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@bcmills
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bcmills commented Oct 7, 2020

From https://build.golang.org/log/671679e6be3aa57b463f7fa294f5dc59ba4ec007:

# golang.org/x/text/internal/number
internal/number/decimal.go:353:19: internal compiler error: '(*Decimal).ConvertInt': two final stores - simultaneous live stores v40 = StaticCall <mem> {AuxCall{"".(*Decimal).ConvertFloat([*Decimal,0],[RoundingContext,8],[float64,24],[int,32])}} [40] v79 v90 = Store <mem> {*Decimal} v54 v8 v1

goroutine 35 [running]:
runtime/debug.Stack(0xd6ece0, 0xc00000e018, 0x0)
	/workdir/go/src/runtime/debug/stack.go:24 +0x9f
cmd/compile/internal/gc.Fatalf(0xc00111e200, 0x37, 0xc001111f20, 0x3, 0x3)
	/workdir/go/src/cmd/compile/internal/gc/subr.go:199 +0x1b0
cmd/compile/internal/gc.(*ssafn).Fatalf(0xc0011114d0, 0x16113000000003, 0xc77b5c, 0x31, 0xc00036aaa0, 0x2, 0x2)
	/workdir/go/src/cmd/compile/internal/gc/ssa.go:6982 +0x1a5
cmd/compile/internal/ssa.(*Func).Fatalf(...)
	/workdir/go/src/cmd/compile/internal/ssa/func.go:652
cmd/compile/internal/ssa.(*Block).Fatalf(...)
	/workdir/go/src/cmd/compile/internal/ssa/block.go:363
cmd/compile/internal/ssa.dse(0xc000fe0c60)
	/workdir/go/src/cmd/compile/internal/ssa/deadstore.go:67 +0xd14
cmd/compile/internal/ssa.Compile(0xc000fe0c60)
	/workdir/go/src/cmd/compile/internal/ssa/compile.go:96 +0x9cd
cmd/compile/internal/gc.buildssa(0xc0000cf760, 0x2, 0x0)
	/workdir/go/src/cmd/compile/internal/gc/ssa.go:465 +0xe1a
cmd/compile/internal/gc.compileSSA(0xc0000cf760, 0x2)
	/workdir/go/src/cmd/compile/internal/gc/pgen.go:319 +0x5d
cmd/compile/internal/gc.compileFunctions.func2(0xc000d53020, 0xc000d482b0, 0x2)
	/workdir/go/src/cmd/compile/internal/gc/pgen.go:384 +0x4d
created by cmd/compile/internal/gc.compileFunctions
	/workdir/go/src/cmd/compile/internal/gc/pgen.go:382 +0x129

This failure mode appears to have been introduced at CL 259203 (CC @dr2chase @cherrymui).
@bcmills bcmills added NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. release-blocker Soon This needs action soon. (recent regressions, service outages, unusual time-sensitive situations) labels Oct 7, 2020
@bcmills bcmills added this to the Go1.16 milestone Oct 7, 2020
@dr2chase dr2chase self-assigned this Oct 7, 2020
@dr2chase
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dr2chase commented Oct 7, 2020

Almost certainly late call lowering.

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Change https://golang.org/cl/260237 mentions this issue: cmd/compile: store call args in the call block

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