PMULLD:          "PMULLD",
	PMULLW:          "PMULLW",
	PMULUDQ:         "PMULUDQ",
	POP:             "POP",
	POPA:            "POPA",
	POPAD:           "POPAD",
	POPCNT:          "POPCNT",
	POPF:            "POPF",
	POPFD:           "POPFD",
	POPFQ:           "POPFQ",
	POR:             "POR",
	PREFETCHNTA:     "PREFETCHNTA",
	PREFETCHT0:      "PREFETCHT0",
	PREFETCHT1:      "PREFETCHT1",

	deferBitsAddr *ssa.Value
	deferBitsTemp *ir.Name

	// line number stack. The current line number is top of stack
	line []src.XPos
	// the last line number processed; it may have been popped
	lastPos src.XPos

	// list of panic calls by function name and line number.
	// Used to deduplicate panic calls.
	panics map[funcLine]*ssa.Block

	cgoUnsafeArgs       bool

	Push(wr http2FrameWriteRequest)

	// Pop dequeues the next frame to write. Returns false if no frames can
	// be written. Frames with a given wr.StreamID() are Pop'd in the same
	// order they are Push'd, except RST_STREAM frames. No frames should be
	// discarded except by CloseStream.
	Pop() (wr http2FrameWriteRequest, ok bool)
}