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Re: MS/CW-style inline assembly for GCC


Richard Henderson wrote:

On Tue, May 04, 2004 at 02:16:53PM -0700, Stan Shebs wrote:

I presume you're also parsing the asm opcode to know what register
class is needed at a particular point?

Well, no - so far the type of the variable has been sufficient to pick
a good register class.


Oh, really?


	int x, y;
	asm {
	  addi x, y, 3
	};

In this case Y must be class 'b', not class 'r'.  Unless you're going
to just use 'b' all the time for integer types [...]

Exactamundo. :-) Sure some code could be slower because I always
use 'b' instead of choosing on a per-instruction-and-operand basis,
but I think it would take a pretty contrived example to get a
measurable speed hit.

Stan


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