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handle CR cache though it's not efficient with current approach without

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superblock (traces) optimization.
This commit is contained in:
gbeauche 2003-11-30 17:17:32 +00:00
parent 7594e26d36
commit 10db506aa5
1 changed files with 36 additions and 0 deletions
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36
SheepShaver/src/kpx_cpu/src/cpu/ppc/ppc-dyngen.cpp
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@ -198,13 +198,49 @@ void powerpc_dyngen::gen_record_cr0_T0(void)
gen_compare_T0_im(0, 0);
}
/**
* Prepare condition register cache for branch
*
* This was meant to be a CR caching system but gain is almost
* zero. However, this shows the ability to handle a CR cache
* forwards and actually, a superblock-level (traces) optimizer
* with proper code generation will benefit from it.
**/
#define USE_CR_CACHE 1
void powerpc_dyngen::gen_prepare_RC(int bi)
{
const int crf = bi / 4;
const int crb = bi % 4;
#if USE_CR_CACHE
if (rc_cache.crf() == crf) {
if (crb != 3) {
// Rematerialize (LT, GT, EQ) if they are not live
if (rc_cache.val_status() == RC_cache::STATUS_VALID)
gen_commit_rc_cache_cr(crf);
else
gen_load_RC_cr(crf);
}
else {
// Rematerialize SO if it is not in cache
if (rc_cache.so_status() == RC_cache::STATUS_VALID)
gen_commit_so_cache_cr(crf);
else
gen_load_RC_cr(crf);
}
invalidate_cr_cache();
}
else {
// Reload flags from memory
gen_commit_cr();
gen_load_RC_cr(crf);
}
#else
gen_commit_cr();
gen_load_RC_cr(crf);
#endif
}
void powerpc_dyngen::gen_bc_A0(int bo, int bi, uint32 npc)