Re: Help for Simplescalar's cache.c code
- From: "globalsk" <jmilanasue@xxxxxxxxx>
- Date: 9 Jan 2007 02:55:57 -0800
Just in case, I'm asking this question for a project at my university,
so is nothing commercial.
On 9 ene, 10:30, "globalsk" <jmilana...@xxxxxxxxx> wrote:
Hello,
I'm trying to understand this fragment of code in Simplescalar's
cache.c code (I've search and look over dozens sites, including
simplescalar.com and there's no help about the coding):
/* cache access macros */
#define CACHE_TAG(cp, addr) ((addr) >> (cp)->tag_shift)
#define CACHE_SET(cp, addr) (((addr) >> (cp)->set_shift) &
(cp)->set_mask)
#define CACHE_BLK(cp, addr) ((addr) & (cp)->blk_mask)
#define CACHE_TAGSET(cp, addr) ((addr) & (cp)->tagset_mask)
I know is about shifting and moving bits around, but don't know how and
specially why is done in this way and for what.
cp is an structure for a cache
addr is a typedef qword_t (64 bits)
md_addr_t blk_mask; idem, typedef qword_t
int set_shift;
md_addr_t set_mask; /* use *after* shift */
int tag_shift;
md_addr_t tag_mask; /* use *after* shift */
md_addr_t tagset_mask; /* used for fast hit detection */
Maybe this is little information, but maybe someone with the knowledge
about caches and this type of coding can help out. Please if someone
can give a helping hand about this and links where they explain in more
detail simplescalar's code will be very appreciated.
Please forgive my syntax mistakes, english is not my mother tongue.
.
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- From: globalsk
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