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| author | Quentin Carbonneaux <quentin.carbonneaux@yale.edu> | 2015-08-10 10:02:07 -0400 |
|---|---|---|
| committer | Quentin Carbonneaux <quentin.carbonneaux@yale.edu> | 2015-09-15 23:01:31 -0400 |
| commit | 03785fbc9a3f786ad49f2bc77518e739a7d4b469 (patch) | |
| tree | c71e4668b89ae653418d909876ef6ead88a716ed /lisc/rega.c | |
| parent | 44329afff582b3e6a45421cf8b29e1bb98f2ed5b (diff) | |
| download | roux-03785fbc9a3f786ad49f2bc77518e739a7d4b469.tar.gz | |
use round-robin in ralloc
This gives a more uniform use of the registers.
Diffstat (limited to 'lisc/rega.c')
| -rw-r--r-- | lisc/rega.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/lisc/rega.c b/lisc/rega.c index 98fe711..b1eabcb 100644 --- a/lisc/rega.c +++ b/lisc/rega.c @@ -72,7 +72,8 @@ radd(RMap *m, int t, int r) static Ref ralloc(RMap *m, int t) { - int r; + static int x; + int n, r; if (BGET(m->bt, t)) { r = rfind(m, t); @@ -80,8 +81,13 @@ ralloc(RMap *m, int t) } else { r = tmp[t].hint; if (r == -1 || BGET(m->br, r)) - for (r=RAX; BGET(m->br, r); r++) - ; + for (n=0;; x=(x+1)%NReg, n++) { + if (n > NReg) + diag("rega: no more regs"); + r = RAX + x; + if (!BGET(m->br, r)) + break; + } radd(m, t, r); if (tmp[t].hint == -1) tmp[t].hint = r; @@ -294,9 +300,9 @@ rega(Fn *fn) cur.bt = (Bits){{0}}; cur.br = (Bits){{0}}; b1 = b; - if (b->s1 && b1->loop < b->s1->loop) + if (b->s1 && b1->loop <= b->s1->loop) b1 = b->s1; - if (b->s2 && b1->loop < b->s2->loop) + if (b->s2 && b1->loop <= b->s2->loop) b1 = b->s1; /* try to reuse the register * assignment of the most frequent |