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add basic support for stack allocation

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This commit is contained in:
Quentin Carbonneaux 2015-08-12 15:25:53 -04:00
parent 8be35bf2be
commit 78bf28f56e
4 changed files with 54 additions and 3 deletions
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13
lisc/emit.c
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@ -128,6 +128,7 @@ eins(Ins i, Fn *fn, FILE *f)
static char *otoa[NOp] = {
[OAdd] = "add",
[OSub] = "sub",
[OAnd] = "and",
[OLoad] = "mov",
[OLoadss] = "movsw",
[OLoadus] = "movzw",
@ -140,12 +141,13 @@ eins(Ins i, Fn *fn, FILE *f)
[OStores - OStorel] = "w",
[OStoreb - OStorel] = "b",
};
int r;
int reg;
int64_t val;
switch (i.op) {
case OAdd:
case OSub:
case OAnd:
if (req(i.to, i.arg[1])) {
if (i.op == OSub) {
eop("neg", i.to, R, fn, f);
@ -177,8 +179,8 @@ eins(Ins i, Fn *fn, FILE *f)
case OStoreb:
fprintf(f, "\tmov%s ", stoa[i.op - OStorel]);
if (rtype(i.arg[0]) == RReg) {
r = RBASE(i.arg[0].val);
fprintf(f, "%%%s", rsub[r][i.op - OStorel]);
reg = RBASE(i.arg[0].val);
fprintf(f, "%%%s", rsub[reg][i.op - OStorel]);
} else
eref(i.arg[0], fn, f);
fprintf(f, ", ");
@ -200,6 +202,11 @@ eins(Ins i, Fn *fn, FILE *f)
eref(i.to, fn, f);
fprintf(f, "\n");
break;
case OAlloc:
eop("sub", i.arg[0], REG(RSP), fn, f);
if (!req(i.to, R))
eop("mov", REG(RSP), i.to, fn ,f);
break;
case OSwap:
eop("xchg", i.arg[0], i.arg[1], fn, f);
break;