func emitRbrac(asm *amd64.Assembler, cc *compiled) {
header := cc.stack[len(cc.stack)-1]
cc.stack = cc.stack[:len(cc.stack)-1]
asm.JmpRel(gojit.Addr(asm.Buf[header:]))
end := asm.Off
asm.Off = header
asm.Testb(amd64.Imm{0xff}, amd64.Indirect{amd64.Rax, 0, 8})
asm.JccRel(amd64.CC_Z, gojit.Addr(asm.Buf[end:]))
asm.Off = end
}
func jcc(a *amd64.Assembler, cc byte, over func(*amd64.Assembler)) {
start := a.Off
a.JccShort(cc, 0)
base := a.Off
over(a)
end := a.Off
a.Off = start
if int(int8(end-base)) != end-base {
panic("jcc: too far!")
}
a.JccShort(cc, int8(end-base))
a.Off = end
}