diff options
| -rw-r--r-- | lisc/rega.c | 19 |
1 files changed, 14 insertions, 5 deletions
diff --git a/lisc/rega.c b/lisc/rega.c index 1117101..a45a6e3 100644 --- a/lisc/rega.c +++ b/lisc/rega.c @@ -28,6 +28,17 @@ hint(int t) return &tmp[phicls(t, tmp)].hint.r; } +static void +sethint(int t, int r) +{ + ulong m; + + m = tmp[phicls(t, tmp)].hint.m; + if (*hint(t) == -1) + if (!(BIT(r) & m)) + *hint(t) = r; +} + static int rfind(RMap *m, int t) { @@ -96,8 +107,7 @@ ralloc(RMap *m, int t) diag("rega: no more regs"); } radd(m, t, r); - if (*hint(t) == -1) - *hint(t) = r; + sethint(t, r); return TMP(r); } @@ -340,8 +350,7 @@ doblk(Blk *b, RMap *cur) } if (isreg(i->to)) if (rtype(i->arg[0]) == RTmp) - if (*hint(i->arg[0].val) == -1) - *hint(i->arg[0].val) = i->to.val; + sethint(i->arg[0].val, i->to.val); /* fall through */ default: if (!req(i->to, R)) { @@ -402,7 +411,7 @@ rega(Fn *fn) break; else { assert(rtype(i->to) == RTmp); - *hint(i->to.val) = i->arg[0].val; + sethint(i->to.val, i->arg[0].val); } /* 2. assign registers following post-order */ |