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| author | Quentin Carbonneaux <quentin.carbonneaux@yale.edu> | 2015-08-17 21:16:03 -0400 |
|---|---|---|
| committer | Quentin Carbonneaux <quentin.carbonneaux@yale.edu> | 2015-09-15 23:01:31 -0400 |
| commit | 0f879b9b0245e0b23a11ac65943846d312b3786f (patch) | |
| tree | b765f33931a8d8a9dc158d573b9a29659557b073 /lisc/rega.c | |
| parent | a767351bdd80d0ba97599372d9dd9ad571601b2c (diff) | |
| download | roux-0f879b9b0245e0b23a11ac65943846d312b3786f.tar.gz | |
tweak block-border heuristic for reg. allocation
We only allocate a register that has a hint if the hint register is not used already. In the max example it gives a better result and it does not seem to affect the collatz test.
Diffstat (limited to 'lisc/rega.c')
| -rw-r--r-- | lisc/rega.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/lisc/rega.c b/lisc/rega.c index f571011..6b29546 100644 --- a/lisc/rega.c +++ b/lisc/rega.c @@ -324,9 +324,10 @@ rega(Fn *fn) radd(&cur, t, r); for (x=0; x<2; x++) for (t=Tmp0; t<fn->ntmp; t++) - if (x==1 || tmp[t].hint!=-1) if (BGET(b->out, t)) if (!BGET(cur.b, t)) + if (x == 1 + || ((r=tmp[t].hint) != -1 && !BGET(cur.b, r))) ralloc(&cur, t); /* process instructions */ end[n] = cur; |