[M3commit] CVS Update: cm3

[Tony Hosking]

On Nov 23, 2010, at 10:49 AM, Jay Krell wrote:

> CVSROOT:	/usr/cvs
> Changes by:	jkrell at birch.	10/11/23 10:49:57
> 
> Modified files:
> 	cm3/m3-sys/m3cc/gcc/gcc/m3cg/: parse.c 
> 
> Log message:
> 	Go with the obvious less heavy handed fix of only avoiding
> 	fold for integer division.

I don't understand what the issue is with folding on integer division.  Please explain.

> 	This is enough for test p240 and the unoptimized code is definitely better.
> 	NOT fully tested, but really probably works.
> 	It is probably worth digging into the frontend to see if there is a difference
> 	in the types. It is probably also worth digging in the backend, like,
> 	we do put in the casts consistently, why are they only not effective
> 	for divide? I realize that a little bit of analysis goes a long way
> 	on many divide cases: "divide tends to produce small results", sort of.
> 	On the other hand, it isn't worth too much effort.
> 	Divide is the slowest least used integer operation.