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selfhost: fix 4B array load/store width + 8B uninit zero-init

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Hojun-Cho
2026-05-12 16:30:24 +09:00
parent e087c843e9
commit 67eaa9796a
6 changed files with 279 additions and 141 deletions
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33
selfhost/cmd/wcc/cgenexpr.ww
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@@ -516,18 +516,22 @@ fn cgident(c: *cgen, n: *node) void = {
};
fn cgindex(c: *cgen, n: *node) void = {
// Element-size-aware load: u8-element bases use MOVZBQ,
// everything else MOVQ. Fast path when the base is a bare
// ident (mem.ww shape).
// Element-size-aware load: u8 → MOVZBQ, i32 → MOVSXD, u32 → MOVL,
// str → (ptr, len) into (AX, BX), everything else → MOVQ. Fast
// path when the base is a bare ident (mem.ww shape).
let base: *node = n.lhs;
let idx: *node = n.rhs;
let esz: i32 = 8;
let signed_elem: bool = false;
let baselocal: *local = nil;
if (base != nil) {
if (base.kind == nkind.N_IDENT) {
let bn: str = base.str;
baselocal = localfindnode(c, bn);
if (baselocal != nil) { esz = elemsizeof(baselocal.tnode); };
if (baselocal != nil) {
esz = elemsizeof(baselocal.tnode);
signed_elem = elemissigned(baselocal.tnode);
};
} else { if (base.kind == nkind.N_DOT) {
esz = indexbaseesz(c, base);
};};
@@ -561,8 +565,12 @@ fn cgindex(c: *cgen, n: *node) void = {
emitline("\tMOVQ\tCX, BX\n");
return;
};
if (esz == 1) { emitline("\tMOVZBQ\t(BX), AX\n"); }
else { emitline("\tMOVQ\t(BX), AX\n"); };
if (esz == 1) { emitline("\tMOVZBQ\t(BX), AX\n"); }
else { if (esz == 4) {
if (signed_elem) { emitline("\tMOVSXD\t(BX), AX\n"); }
else { emitline("\tMOVL\t(BX), AX\n"); };
}
else { emitline("\tMOVQ\t(BX), AX\n"); };};
return;
};
// Generic fallback when base isn't a plain ident.
@@ -575,8 +583,12 @@ fn cgindex(c: *cgen, n: *node) void = {
emitline("\tMOVQ\t(AX), AX\n");
return;
};
if (esz == 1) { emitline("\tMOVZBQ\t(AX), AX\n"); }
else { emitline("\tMOVQ\t(AX), AX\n"); };
if (esz == 1) { emitline("\tMOVZBQ\t(AX), AX\n"); }
else { if (esz == 4) {
if (signed_elem) { emitline("\tMOVSXD\t(AX), AX\n"); }
else { emitline("\tMOVL\t(AX), AX\n"); };
}
else { emitline("\tMOVQ\t(AX), AX\n"); };};
return;
};
@@ -1822,8 +1834,9 @@ fn cgassign(c: *cgen, n: *node) void = {
emitline("\tMOVQ\tCX, 8(BX)\n");
return;
};
if (esz == 1) { emitline("\tMOVB\tAX, (BX)\n"); }
else { emitline("\tMOVQ\tAX, (BX)\n"); };
if (esz == 1) { emitline("\tMOVB\tAX, (BX)\n"); }
else { if (esz == 4) { emitline("\tMOVL\tAX, (BX)\n"); }
else { emitline("\tMOVQ\tAX, (BX)\n"); };};
return;
};
};