diff options
Diffstat (limited to 'util.c')
| -rw-r--r-- | util.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/util.c b/util.c index 5296b86..6a33d1a 100644 --- a/util.c +++ b/util.c @@ -429,6 +429,36 @@ blit0(Ref rdst, Ref rsrc, uint sz, Fn *fn) } void +salloc(Ref rt, Ref rs, Fn *fn) +{ + Ref r0, r1; + int64_t sz; + + /* we need to make sure + * the stack remains aligned + * (rsp = 0) mod 16 + */ + fn->dynalloc = 1; + if (rtype(rs) == RCon) { + sz = fn->con[rs.val].bits.i; + if (sz < 0 || sz >= INT_MAX-15) + err("invalid alloc size %"PRId64, sz); + sz = (sz + 15) & -16; + emit(Osalloc, Kl, rt, getcon(sz, fn), R); + } else { + /* r0 = (r + 15) & -16 */ + r0 = newtmp("isel", Kl, fn); + r1 = newtmp("isel", Kl, fn); + emit(Osalloc, Kl, rt, r0, R); + emit(Oand, Kl, r0, r1, getcon(-16, fn)); + emit(Oadd, Kl, r1, rs, getcon(15, fn)); + if (fn->tmp[rs.val].slot != -1) + err("unlikely alloc argument %%%s for %%%s", + fn->tmp[rs.val].name, fn->tmp[rt.val].name); + } +} + +void bsinit(BSet *bs, uint n) { n = (n + NBit-1) / NBit; |