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move spill and emit to the new slot system

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In emit, I worked a little to make sure that framesz works
when we change the size of the svec array (if we need more
alignments).
This commit is contained in:
Quentin Carbonneaux 2015-08-18 19:11:48 -04:00
parent 627e45e330
commit 6f09869ea1
4 changed files with 41 additions and 17 deletions
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21
lisc/emit.c
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@ -280,12 +280,28 @@ eins(Ins i, Fn *fn, FILE *f)
}
}
static int
framesz(Fn *fn)
{
enum { N = sizeof (Fn){0}.svec / sizeof (Fn){0}.svec[0] };
int i, a, f;
f = 0;
for (i=N-1, a=1<<i; i>=0; i--, a/=2)
if (f == 0 || f - a == fn->svec[i])
f = fn->svec[i];
a = 1 << (N-2);
while (f % (2 * a) != a)
f += a - f % a;
return f * 16 / (1 << (N-1));
}
void
emitfn(Fn *fn, FILE *f)
{
Blk *b, *s;
Ins *i;
int c;
int c, fs;
fprintf(f,
".text\n"
@ -295,6 +311,9 @@ emitfn(Fn *fn, FILE *f)
"\tpush %%rbp\n"
"\tmov %%rsp, %%rbp\n"
);
fs = framesz(fn);
if (fs)
fprintf(f, "\tsub $%d, %%rsp\n", fs);
for (b=fn->start; b; b=b->link) {
fprintf(f, ".L%s:\n", b->name);
for (i=b->ins; i-b->ins < b->nins; i++)