🚀 go-pugleaf

See the node "Extended Asm" in the gcc manual.  In short:

	   You must specify an assembler instruction template much like what
	appears in a machine description, plus an operand constraint string for
	each operand.

	   For example, here is how to use the 68881's `fsinx' instruction:

	     asm ("fsinx %1,%0" : "=f" (result) : "f" (angle));

	Here `angle' is the C expression for the input operand while `result'
	is that of the output operand.  Each has `"f"' as its operand
	constraint, saying that a floating point register is required.  The `='
	in `=f' indicates that the operand is an output; all output operands'
	constraints must use `='.  The constraints use the same language used
	in the machine description (*See Constraints::.).

	   Each operand is described by an operand-constraint string followed
	by the C expression in parentheses.  A colon separates the assembler
	template from the first output operand, and another separates the last
	output operand from the first input, if any.  Commas separate output
	operands and separate inputs.  The total number of operands is limited
	to ten or to the maximum number of operands in any instruction pattern
	in the machine description, whichever is greater.
-- 
Hal Peterson			NetStar, Inc.		  Eden Prairie, MN, USA
voice: +1 612 996 6853		FAX:  +1 612 943 8939	  hrp@netstar.com