cmd/compile: ICE in phiopt pass #45323
Description
package main
func g() bool
func f(y int) bool {
b, ok := true, false
if y > 1 {
ok = g()
}
if !ok {
ok = g()
b = false
}
if !ok {
return false
}
return b
}
> go tool compile test.go
/home/khr/gowork/test.go:7:9: internal compiler error: 'f': panic during phiopt while compiling f:
runtime error: index out of range [-1]
goroutine 7 [running]:
cmd/compile/internal/ssa.Compile.func1(0xc00041ce38, 0xc0003ea4e0)
/home/khr/sandbox/ro/src/cmd/compile/internal/ssa/compile.go:48 +0x9f
panic(0xe06620, 0xc000026960)
/home/khr/sandbox/ro/src/runtime/panic.go:1031 +0x25b
cmd/compile/internal/ssa.convertPhi(0xc0004b6d60, 0xc000480bd0, 0xffffffffffffffff)
/home/khr/sandbox/ro/src/cmd/compile/internal/ssa/phiopt.go:318 +0x1aa
cmd/compile/internal/ssa.phiopt(0xc0003ea4e0)
/home/khr/sandbox/ro/src/cmd/compile/internal/ssa/phiopt.go:216 +0x2bc
cmd/compile/internal/ssa.Compile(0xc0003ea4e0)
/home/khr/sandbox/ro/src/cmd/compile/internal/ssa/compile.go:96 +0xc76
cmd/compile/internal/ssagen.buildssa(0xc000144420, 0x0, 0x0)
/home/khr/sandbox/ro/src/cmd/compile/internal/ssagen/ssa.go:629 +0x22e5
cmd/compile/internal/ssagen.Compile(0xc000144420, 0x0)
/home/khr/sandbox/ro/src/cmd/compile/internal/ssagen/pgen.go:151 +0x5f
cmd/compile/internal/gc.compileFunctions.func2.1(0xc0000323f0, 0xc000144420, 0xc00000e510, 0xc000023100)
/home/khr/sandbox/ro/src/cmd/compile/internal/gc/compile.go:130 +0x65
created by cmd/compile/internal/gc.compileFunctions.func2
/home/khr/sandbox/ro/src/cmd/compile/internal/gc/compile.go:128 +0x8e
Should be a simple fix.