cmd/compile: bad HMUL

[dvyukov]

go tool compile crashes on the following program:

package a
var x = 1/"."[0]

naddr [0xc8201c6360]
.   HMUL u(2) a(true) l(2) tc(1) byte
/tmp/222.go:2: internal compiler error: naddr: bad HMUL 
panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xb code=0x1 addr=0x0 pc=0x5cfd10]

goroutine 1 [running]:
cmd/compile/internal/gc.hcrash()
    src/cmd/compile/internal/gc/subr.go:105 +0x50
cmd/compile/internal/gc.Fatal(0x854a90, 0x10, 0xc8200e1db0, 0x2, 0x2)
    src/cmd/compile/internal/gc/subr.go:198 +0x2b1
cmd/compile/internal/gc.Naddr(0xc8201cc370, 0xc8201c6360)
    src/cmd/compile/internal/gc/gsubr.go:313 +0x1a5b
cmd/compile/internal/amd64.gins(0x307d, 0xc8201c6360, 0xc8201c74d0, 0x0)
    src/cmd/compile/internal/amd64/gsubr.go:629 +0x127
cmd/compile/internal/amd64.gmove(0xc8201c6360, 0xc8201c74d0)
    src/cmd/compile/internal/amd64/gsubr.go:532 +0x4e8
cmd/compile/internal/gc.cgen_wb(0xc8201c6360, 0xc8201c74d0, 0xc8201c7500)
    src/cmd/compile/internal/gc/cgen.go:252 +0x454a
cmd/compile/internal/gc.Cgen(0xc8201c6360, 0xc8201c74d0)
    src/cmd/compile/internal/gc/cgen.go:19 +0x30
cmd/compile/internal/gc.cgen_wb(0xc8201c6480, 0xc8201c73b0, 0xc8201c7400)
    src/cmd/compile/internal/gc/cgen.go:504 +0x31de
cmd/compile/internal/gc.Cgen(0xc8201c6480, 0xc8201c73b0)
    src/cmd/compile/internal/gc/cgen.go:19 +0x30
cmd/compile/internal/gc.cgen_wb(0xc8201c66c0, 0xc8201c7320, 0xc8201c7300)
    src/cmd/compile/internal/gc/cgen.go:758 +0x219e
cmd/compile/internal/gc.Cgen(0xc8201c66c0, 0xc8201c7320)
    src/cmd/compile/internal/gc/cgen.go:19 +0x30
cmd/compile/internal/amd64.cgen_shift(0x50, 0xc8201c6701, 0xc8201c66c0, 0xc8201c6750, 0xc8201c7200)
    src/cmd/compile/internal/amd64/ggen.go:383 +0xbc
cmd/compile/internal/gc.cgen_wb(0xc8201c67e0, 0xc8201c7200, 0xc8201c7200)
    src/cmd/compile/internal/gc/cgen.go:685 +0x3aa2
cmd/compile/internal/gc.Cgen(0xc8201c67e0, 0xc8201c7200)
    src/cmd/compile/internal/gc/cgen.go:19 +0x30
cmd/compile/internal/gc.cgen_wb(0xc8201c6870, 0xc8201b7dd0, 0x820f00)
    src/cmd/compile/internal/gc/cgen.go:504 +0x31de
cmd/compile/internal/gc.Cgen_as_wb(0xc8201b7dd0, 0xc8201c6870, 0x0)
    src/cmd/compile/internal/gc/gen.go:956 +0x166
cmd/compile/internal/gc.Cgen_as(0xc8201b7dd0, 0xc8201c6870)
    src/cmd/compile/internal/gc/gen.go:907 +0x30
cmd/compile/internal/gc.gen(0xc8201c6900)
    src/cmd/compile/internal/gc/gen.go:857 +0x185
cmd/compile/internal/gc.Genlist(0xc820193920)
    src/cmd/compile/internal/gc/gen.go:219 +0x30
cmd/compile/internal/gc.compile(0xc8201c3170)
    src/cmd/compile/internal/gc/pgen.go:471 +0xc13
cmd/compile/internal/gc.funccompile(0xc8201c3170)
    src/cmd/compile/internal/gc/dcl.go:1480 +0x1c9
cmd/compile/internal/gc.fninit(0xc8201936e0)
    src/cmd/compile/internal/gc/init.go:188 +0x8d4
cmd/compile/internal/gc.Main()
    src/cmd/compile/internal/gc/lex.go:477 +0x1f08
cmd/compile/internal/amd64.Main()
    src/cmd/compile/internal/amd64/galign.go:127 +0x58d
main.main()
    src/cmd/compile/main.go:26 +0x189

go version devel +514014c Thu Jun 18 15:54:35 2015 +0200 linux/amd64

[gopherbot]

CL https://golang.org/cl/11400 mentions this issue.