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w6c+selfhost: cgassign N_DOT N_INDEX-lhs branch (closes #16)

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Symmetric write-side counterpart of #8, bundled across both stages.
cstage [N]Struct write was broken (1986 gated on TY_PTR); wwstage had
no N_DOT(N_INDEX) write branch at all. New branch covers both
[N]*Struct and [N]Struct via viaptr flag, uses fldstoreop for
scalar/sub-word, MOVSS/MOVSD for float, two-MOVQ for str rhs.
Compound (PLUSEQ etc.) wired for integer scalar.
This commit is contained in:
Hojun-Cho
2026-05-14 00:09:46 +09:00
parent dd92938eff
commit 6354f5267c
6 changed files with 1177 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

210
selfhost/cmd/w6c/main.combined.ww
View File

@@ -11289,6 +11289,216 @@ fn cgassign(c: *cgen, n: *node) void = {
};
};
};
// `arr[i].field = v`: N_DOT lhs whose lhs is N_INDEX. Symmetric
// write-side of the cgdot N_INDEX-lhs branch added for task #8.
// Compute &arr[i] inline (LEAQ for `[N]Struct`, MOVQ for
// `[N]*Struct` / `[]Struct` / `*Struct`), deref once when the
// element is `*Struct`, then store rhs at field.offset(addr).
// Without this both shapes silently drop the store — there is no
// existing wwstage branch for N_DOT(N_INDEX,...) lhs at all (the
// N_INDEX-lhs branch above handles bare `arr[i] = v`, not the
// field write).
if (lhs != nil) {
if (lhs.kind == nkind.N_DOT && lhs.lhs != nil
&& lhs.lhs.kind == nkind.N_INDEX) {
let idxbase: *node = lhs.lhs.lhs;
let idx: *node = lhs.lhs.rhs;
let fld2: str = lhs.str;
if (idxbase != nil) { if (idxbase.kind == nkind.N_IDENT) {
if (idx != nil) {
let lc: *local = localfindnode(c, idxbase.str);
if (lc != nil) { if (lc.tnode != nil) {
let tn: *node = lc.tnode;
let elemt: *node = nil;
let baseisarray: bool = false;
let tk: nkind = tn.kind;
if (tk == nkind.N_TSLICE) { elemt = tn.lhs; };
if (tk == nkind.N_TARRAY) { elemt = tn.lhs; baseisarray = true; };
if (tk == nkind.N_TPTR) { elemt = tn.lhs; };
let sname: str;
sname.ptr = nil; sname.len = 0;
let viaptr: bool = false;
if (elemt != nil) {
if (elemt.kind == nkind.N_TPTR) {
let inner: *node = elemt.lhs;
if (inner != nil) { if (inner.kind == nkind.N_TNAME) {
sname = inner.str;
viaptr = true;
};};
} else { if (elemt.kind == nkind.N_TNAME) {
sname = elemt.str;
};};
};
if (sname.len > 0) {
let si: *structinfo = structlookup(c, sname);
if (si != nil) {
let fi: *fieldinfo = si.fields;
for (fi != nil) {
if (streq(fi.fname, fld2)) {
let esz: i32 = elemsizeofc(c, tn);
// f64/f32: rhs in X0. Spill to stack,
// compute &arr[i] in BX (deref if *T),
// then reload X0 and MOVSD/MOVSS.
if (n.op == tkind.TK_ASSIGN) {
if (isfloattype(c, fi.tnode)) {
let mov: str = "MOVSD";
if (isf32type(c, fi.tnode)) { mov = "MOVSS"; };
cgexpr(c, n.rhs);
emitline("\tSUBQ\t$8, SP\n");
emitline("\t");
emitline(mov);
emitline("\tX0, (SP)\n");
cgexpr(c, idx);
if (esz > 1) {
emitline("\tMOVQ\t$");
emitint(esz: i64);
emitline(", CX\n");
emitline("\tIMULQ\tCX, AX\n");
};
if (baseisarray) {
emitline("\tLEAQ\t");
emitoff(lc.off: i64);
emitline("(BP), BX\n");
} else {
emitline("\tMOVQ\t");
emitoff(lc.off: i64);
emitline("(BP), BX\n");
};
emitline("\tADDQ\tAX, BX\n");
if (viaptr) { emitline("\tMOVQ\t(BX), BX\n"); };
emitline("\t");
emitline(mov);
emitline("\t(SP), X0\n");
emitline("\tADDQ\t$8, SP\n");
emitline("\t");
emitline(mov);
emitline("\tX0, ");
emitdispreg(fi.foff: i64, "BX");
emitline("\n");
return;
};
// str rhs: AX=ptr, BX=len. Stash both,
// compute addr in CX so the pop pair
// restores AX/BX intact.
if (isstrtype(c, fi.tnode)) {
cgexpr(c, n.rhs);
emitline("\tPUSHQ\tBX\n");
emitline("\tPUSHQ\tAX\n");
cgexpr(c, idx);
if (esz > 1) {
emitline("\tMOVQ\t$");
emitint(esz: i64);
emitline(", CX\n");
emitline("\tIMULQ\tCX, AX\n");
};
if (baseisarray) {
emitline("\tLEAQ\t");
emitoff(lc.off: i64);
emitline("(BP), CX\n");
} else {
emitline("\tMOVQ\t");
emitoff(lc.off: i64);
emitline("(BP), CX\n");
};
emitline("\tADDQ\tAX, CX\n");
if (viaptr) { emitline("\tMOVQ\t(CX), CX\n"); };
emitline("\tPOPQ\tAX\n");
emitline("\tPOPQ\tBX\n");
emitline("\tMOVQ\tAX, ");
emitdispreg(fi.foff: i64, "CX");
emitline("\n");
emitline("\tMOVQ\tBX, ");
emitdispreg((fi.foff + 8): i64, "CX");
emitline("\n");
return;
};
// scalar plain `=`
cgexpr(c, n.rhs);
emitline("\tPUSHQ\tAX\n");
cgexpr(c, idx);
if (esz > 1) {
emitline("\tMOVQ\t$");
emitint(esz: i64);
emitline(", CX\n");
emitline("\tIMULQ\tCX, AX\n");
};
if (baseisarray) {
emitline("\tLEAQ\t");
emitoff(lc.off: i64);
emitline("(BP), BX\n");
} else {
emitline("\tMOVQ\t");
emitoff(lc.off: i64);
emitline("(BP), BX\n");
};
emitline("\tADDQ\tAX, BX\n");
if (viaptr) { emitline("\tMOVQ\t(BX), BX\n"); };
emitline("\tPOPQ\tAX\n");
let sop: str = fieldstoreop(c, fi);
emitline("\t");
emitline(sop);
emitline("\tAX, ");
emitdispreg(fi.foff: i64, "BX");
emitline("\n");
return;
};
// compound: rhs→push; compute struct
// addr→BX (deref if *T); push addr;
// load old field→AX; pop addr→BX,
// rhs→CX; combine; store. Float/str
// compound not wired.
cgexpr(c, n.rhs);
emitline("\tPUSHQ\tAX\n");
cgexpr(c, idx);
if (esz > 1) {
emitline("\tMOVQ\t$");
emitint(esz: i64);
emitline(", CX\n");
emitline("\tIMULQ\tCX, AX\n");
};
if (baseisarray) {
emitline("\tLEAQ\t");
emitoff(lc.off: i64);
emitline("(BP), BX\n");
} else {
emitline("\tMOVQ\t");
emitoff(lc.off: i64);
emitline("(BP), BX\n");
};
emitline("\tADDQ\tAX, BX\n");
if (viaptr) { emitline("\tMOVQ\t(BX), BX\n"); };
emitline("\tPUSHQ\tBX\n");
let lop: str = fieldloadop(c, fi);
emitline("\t");
emitline(lop);
emitline("\t");
emitdispreg(fi.foff: i64, "BX");
emitline(", AX\n");
emitline("\tPOPQ\tBX\n");
emitline("\tPOPQ\tCX\n");
if (n.op == tkind.TK_PLUSEQ) { emitline("\tADDQ\tCX, AX\n"); };
if (n.op == tkind.TK_MINUSEQ) { emitline("\tSUBQ\tCX, AX\n"); };
if (n.op == tkind.TK_STAREQ) { emitline("\tIMULQ\tCX, AX\n"); };
if (n.op == tkind.TK_AMPEQ) { emitline("\tANDQ\tCX, AX\n"); };
if (n.op == tkind.TK_PIPEEQ) { emitline("\tORQ\tCX, AX\n"); };
if (n.op == tkind.TK_CARETEQ) { emitline("\tXORQ\tCX, AX\n"); };
let sop2: str = fieldstoreop(c, fi);
emitline("\t");
emitline(sop2);
emitline("\tAX, ");
emitdispreg(fi.foff: i64, "BX");
emitline("\n");
return;
};
fi = fi.finext;
};
};
};
};};
};
};};
};
};
// Struct/ptr-to-struct field assignment: `s.f = expr;` or
// `p.f = expr;`. Only plain `=` is wired (compound on field
// is rare and not yet needed by our fixtures).

210
selfhost/cmd/wcc/cgenexpr.ww
View File

@@ -3246,6 +3246,216 @@ fn cgassign(c: *cgen, n: *node) void = {
};
};
};
// `arr[i].field = v`: N_DOT lhs whose lhs is N_INDEX. Symmetric
// write-side of the cgdot N_INDEX-lhs branch added for task #8.
// Compute &arr[i] inline (LEAQ for `[N]Struct`, MOVQ for
// `[N]*Struct` / `[]Struct` / `*Struct`), deref once when the
// element is `*Struct`, then store rhs at field.offset(addr).
// Without this both shapes silently drop the store — there is no
// existing wwstage branch for N_DOT(N_INDEX,...) lhs at all (the
// N_INDEX-lhs branch above handles bare `arr[i] = v`, not the
// field write).
if (lhs != nil) {
if (lhs.kind == nkind.N_DOT && lhs.lhs != nil
&& lhs.lhs.kind == nkind.N_INDEX) {
let idxbase: *node = lhs.lhs.lhs;
let idx: *node = lhs.lhs.rhs;
let fld2: str = lhs.str;
if (idxbase != nil) { if (idxbase.kind == nkind.N_IDENT) {
if (idx != nil) {
let lc: *local = localfindnode(c, idxbase.str);
if (lc != nil) { if (lc.tnode != nil) {
let tn: *node = lc.tnode;
let elemt: *node = nil;
let baseisarray: bool = false;
let tk: nkind = tn.kind;
if (tk == nkind.N_TSLICE) { elemt = tn.lhs; };
if (tk == nkind.N_TARRAY) { elemt = tn.lhs; baseisarray = true; };
if (tk == nkind.N_TPTR) { elemt = tn.lhs; };
let sname: str;
sname.ptr = nil; sname.len = 0;
let viaptr: bool = false;
if (elemt != nil) {
if (elemt.kind == nkind.N_TPTR) {
let inner: *node = elemt.lhs;
if (inner != nil) { if (inner.kind == nkind.N_TNAME) {
sname = inner.str;
viaptr = true;
};};
} else { if (elemt.kind == nkind.N_TNAME) {
sname = elemt.str;
};};
};
if (sname.len > 0) {
let si: *structinfo = structlookup(c, sname);
if (si != nil) {
let fi: *fieldinfo = si.fields;
for (fi != nil) {
if (streq(fi.fname, fld2)) {
let esz: i32 = elemsizeofc(c, tn);
// f64/f32: rhs in X0. Spill to stack,
// compute &arr[i] in BX (deref if *T),
// then reload X0 and MOVSD/MOVSS.
if (n.op == tkind.TK_ASSIGN) {
if (isfloattype(c, fi.tnode)) {
let mov: str = "MOVSD";
if (isf32type(c, fi.tnode)) { mov = "MOVSS"; };
cgexpr(c, n.rhs);
emitline("\tSUBQ\t$8, SP\n");
emitline("\t");
emitline(mov);
emitline("\tX0, (SP)\n");
cgexpr(c, idx);
if (esz > 1) {
emitline("\tMOVQ\t$");
emitint(esz: i64);
emitline(", CX\n");
emitline("\tIMULQ\tCX, AX\n");
};
if (baseisarray) {
emitline("\tLEAQ\t");
emitoff(lc.off: i64);
emitline("(BP), BX\n");
} else {
emitline("\tMOVQ\t");
emitoff(lc.off: i64);
emitline("(BP), BX\n");
};
emitline("\tADDQ\tAX, BX\n");
if (viaptr) { emitline("\tMOVQ\t(BX), BX\n"); };
emitline("\t");
emitline(mov);
emitline("\t(SP), X0\n");
emitline("\tADDQ\t$8, SP\n");
emitline("\t");
emitline(mov);
emitline("\tX0, ");
emitdispreg(fi.foff: i64, "BX");
emitline("\n");
return;
};
// str rhs: AX=ptr, BX=len. Stash both,
// compute addr in CX so the pop pair
// restores AX/BX intact.
if (isstrtype(c, fi.tnode)) {
cgexpr(c, n.rhs);
emitline("\tPUSHQ\tBX\n");
emitline("\tPUSHQ\tAX\n");
cgexpr(c, idx);
if (esz > 1) {
emitline("\tMOVQ\t$");
emitint(esz: i64);
emitline(", CX\n");
emitline("\tIMULQ\tCX, AX\n");
};
if (baseisarray) {
emitline("\tLEAQ\t");
emitoff(lc.off: i64);
emitline("(BP), CX\n");
} else {
emitline("\tMOVQ\t");
emitoff(lc.off: i64);
emitline("(BP), CX\n");
};
emitline("\tADDQ\tAX, CX\n");
if (viaptr) { emitline("\tMOVQ\t(CX), CX\n"); };
emitline("\tPOPQ\tAX\n");
emitline("\tPOPQ\tBX\n");
emitline("\tMOVQ\tAX, ");
emitdispreg(fi.foff: i64, "CX");
emitline("\n");
emitline("\tMOVQ\tBX, ");
emitdispreg((fi.foff + 8): i64, "CX");
emitline("\n");
return;
};
// scalar plain `=`
cgexpr(c, n.rhs);
emitline("\tPUSHQ\tAX\n");
cgexpr(c, idx);
if (esz > 1) {
emitline("\tMOVQ\t$");
emitint(esz: i64);
emitline(", CX\n");
emitline("\tIMULQ\tCX, AX\n");
};
if (baseisarray) {
emitline("\tLEAQ\t");
emitoff(lc.off: i64);
emitline("(BP), BX\n");
} else {
emitline("\tMOVQ\t");
emitoff(lc.off: i64);
emitline("(BP), BX\n");
};
emitline("\tADDQ\tAX, BX\n");
if (viaptr) { emitline("\tMOVQ\t(BX), BX\n"); };
emitline("\tPOPQ\tAX\n");
let sop: str = fieldstoreop(c, fi);
emitline("\t");
emitline(sop);
emitline("\tAX, ");
emitdispreg(fi.foff: i64, "BX");
emitline("\n");
return;
};
// compound: rhs→push; compute struct
// addr→BX (deref if *T); push addr;
// load old field→AX; pop addr→BX,
// rhs→CX; combine; store. Float/str
// compound not wired.
cgexpr(c, n.rhs);
emitline("\tPUSHQ\tAX\n");
cgexpr(c, idx);
if (esz > 1) {
emitline("\tMOVQ\t$");
emitint(esz: i64);
emitline(", CX\n");
emitline("\tIMULQ\tCX, AX\n");
};
if (baseisarray) {
emitline("\tLEAQ\t");
emitoff(lc.off: i64);
emitline("(BP), BX\n");
} else {
emitline("\tMOVQ\t");
emitoff(lc.off: i64);
emitline("(BP), BX\n");
};
emitline("\tADDQ\tAX, BX\n");
if (viaptr) { emitline("\tMOVQ\t(BX), BX\n"); };
emitline("\tPUSHQ\tBX\n");
let lop: str = fieldloadop(c, fi);
emitline("\t");
emitline(lop);
emitline("\t");
emitdispreg(fi.foff: i64, "BX");
emitline(", AX\n");
emitline("\tPOPQ\tBX\n");
emitline("\tPOPQ\tCX\n");
if (n.op == tkind.TK_PLUSEQ) { emitline("\tADDQ\tCX, AX\n"); };
if (n.op == tkind.TK_MINUSEQ) { emitline("\tSUBQ\tCX, AX\n"); };
if (n.op == tkind.TK_STAREQ) { emitline("\tIMULQ\tCX, AX\n"); };
if (n.op == tkind.TK_AMPEQ) { emitline("\tANDQ\tCX, AX\n"); };
if (n.op == tkind.TK_PIPEEQ) { emitline("\tORQ\tCX, AX\n"); };
if (n.op == tkind.TK_CARETEQ) { emitline("\tXORQ\tCX, AX\n"); };
let sop2: str = fieldstoreop(c, fi);
emitline("\t");
emitline(sop2);
emitline("\tAX, ");
emitdispreg(fi.foff: i64, "BX");
emitline("\n");
return;
};
fi = fi.finext;
};
};
};
};};
};
};};
};
};
// Struct/ptr-to-struct field assignment: `s.f = expr;` or
// `p.f = expr;`. Only plain `=` is wired (compound on field
// is rare and not yet needed by our fixtures).

210
selfhost/cmd/wwdump/main.combined.ww
View File

@@ -11289,6 +11289,216 @@ fn cgassign(c: *cgen, n: *node) void = {
};
};
};
// `arr[i].field = v`: N_DOT lhs whose lhs is N_INDEX. Symmetric
// write-side of the cgdot N_INDEX-lhs branch added for task #8.
// Compute &arr[i] inline (LEAQ for `[N]Struct`, MOVQ for
// `[N]*Struct` / `[]Struct` / `*Struct`), deref once when the
// element is `*Struct`, then store rhs at field.offset(addr).
// Without this both shapes silently drop the store — there is no
// existing wwstage branch for N_DOT(N_INDEX,...) lhs at all (the
// N_INDEX-lhs branch above handles bare `arr[i] = v`, not the
// field write).
if (lhs != nil) {
if (lhs.kind == nkind.N_DOT && lhs.lhs != nil
&& lhs.lhs.kind == nkind.N_INDEX) {
let idxbase: *node = lhs.lhs.lhs;
let idx: *node = lhs.lhs.rhs;
let fld2: str = lhs.str;
if (idxbase != nil) { if (idxbase.kind == nkind.N_IDENT) {
if (idx != nil) {
let lc: *local = localfindnode(c, idxbase.str);
if (lc != nil) { if (lc.tnode != nil) {
let tn: *node = lc.tnode;
let elemt: *node = nil;
let baseisarray: bool = false;
let tk: nkind = tn.kind;
if (tk == nkind.N_TSLICE) { elemt = tn.lhs; };
if (tk == nkind.N_TARRAY) { elemt = tn.lhs; baseisarray = true; };
if (tk == nkind.N_TPTR) { elemt = tn.lhs; };
let sname: str;
sname.ptr = nil; sname.len = 0;
let viaptr: bool = false;
if (elemt != nil) {
if (elemt.kind == nkind.N_TPTR) {
let inner: *node = elemt.lhs;
if (inner != nil) { if (inner.kind == nkind.N_TNAME) {
sname = inner.str;
viaptr = true;
};};
} else { if (elemt.kind == nkind.N_TNAME) {
sname = elemt.str;
};};
};
if (sname.len > 0) {
let si: *structinfo = structlookup(c, sname);
if (si != nil) {
let fi: *fieldinfo = si.fields;
for (fi != nil) {
if (streq(fi.fname, fld2)) {
let esz: i32 = elemsizeofc(c, tn);
// f64/f32: rhs in X0. Spill to stack,
// compute &arr[i] in BX (deref if *T),
// then reload X0 and MOVSD/MOVSS.
if (n.op == tkind.TK_ASSIGN) {
if (isfloattype(c, fi.tnode)) {
let mov: str = "MOVSD";
if (isf32type(c, fi.tnode)) { mov = "MOVSS"; };
cgexpr(c, n.rhs);
emitline("\tSUBQ\t$8, SP\n");
emitline("\t");
emitline(mov);
emitline("\tX0, (SP)\n");
cgexpr(c, idx);
if (esz > 1) {
emitline("\tMOVQ\t$");
emitint(esz: i64);
emitline(", CX\n");
emitline("\tIMULQ\tCX, AX\n");
};
if (baseisarray) {
emitline("\tLEAQ\t");
emitoff(lc.off: i64);
emitline("(BP), BX\n");
} else {
emitline("\tMOVQ\t");
emitoff(lc.off: i64);
emitline("(BP), BX\n");
};
emitline("\tADDQ\tAX, BX\n");
if (viaptr) { emitline("\tMOVQ\t(BX), BX\n"); };
emitline("\t");
emitline(mov);
emitline("\t(SP), X0\n");
emitline("\tADDQ\t$8, SP\n");
emitline("\t");
emitline(mov);
emitline("\tX0, ");
emitdispreg(fi.foff: i64, "BX");
emitline("\n");
return;
};
// str rhs: AX=ptr, BX=len. Stash both,
// compute addr in CX so the pop pair
// restores AX/BX intact.
if (isstrtype(c, fi.tnode)) {
cgexpr(c, n.rhs);
emitline("\tPUSHQ\tBX\n");
emitline("\tPUSHQ\tAX\n");
cgexpr(c, idx);
if (esz > 1) {
emitline("\tMOVQ\t$");
emitint(esz: i64);
emitline(", CX\n");
emitline("\tIMULQ\tCX, AX\n");
};
if (baseisarray) {
emitline("\tLEAQ\t");
emitoff(lc.off: i64);
emitline("(BP), CX\n");
} else {
emitline("\tMOVQ\t");
emitoff(lc.off: i64);
emitline("(BP), CX\n");
};
emitline("\tADDQ\tAX, CX\n");
if (viaptr) { emitline("\tMOVQ\t(CX), CX\n"); };
emitline("\tPOPQ\tAX\n");
emitline("\tPOPQ\tBX\n");
emitline("\tMOVQ\tAX, ");
emitdispreg(fi.foff: i64, "CX");
emitline("\n");
emitline("\tMOVQ\tBX, ");
emitdispreg((fi.foff + 8): i64, "CX");
emitline("\n");
return;
};
// scalar plain `=`
cgexpr(c, n.rhs);
emitline("\tPUSHQ\tAX\n");
cgexpr(c, idx);
if (esz > 1) {
emitline("\tMOVQ\t$");
emitint(esz: i64);
emitline(", CX\n");
emitline("\tIMULQ\tCX, AX\n");
};
if (baseisarray) {
emitline("\tLEAQ\t");
emitoff(lc.off: i64);
emitline("(BP), BX\n");
} else {
emitline("\tMOVQ\t");
emitoff(lc.off: i64);
emitline("(BP), BX\n");
};
emitline("\tADDQ\tAX, BX\n");
if (viaptr) { emitline("\tMOVQ\t(BX), BX\n"); };
emitline("\tPOPQ\tAX\n");
let sop: str = fieldstoreop(c, fi);
emitline("\t");
emitline(sop);
emitline("\tAX, ");
emitdispreg(fi.foff: i64, "BX");
emitline("\n");
return;
};
// compound: rhs→push; compute struct
// addr→BX (deref if *T); push addr;
// load old field→AX; pop addr→BX,
// rhs→CX; combine; store. Float/str
// compound not wired.
cgexpr(c, n.rhs);
emitline("\tPUSHQ\tAX\n");
cgexpr(c, idx);
if (esz > 1) {
emitline("\tMOVQ\t$");
emitint(esz: i64);
emitline(", CX\n");
emitline("\tIMULQ\tCX, AX\n");
};
if (baseisarray) {
emitline("\tLEAQ\t");
emitoff(lc.off: i64);
emitline("(BP), BX\n");
} else {
emitline("\tMOVQ\t");
emitoff(lc.off: i64);
emitline("(BP), BX\n");
};
emitline("\tADDQ\tAX, BX\n");
if (viaptr) { emitline("\tMOVQ\t(BX), BX\n"); };
emitline("\tPUSHQ\tBX\n");
let lop: str = fieldloadop(c, fi);
emitline("\t");
emitline(lop);
emitline("\t");
emitdispreg(fi.foff: i64, "BX");
emitline(", AX\n");
emitline("\tPOPQ\tBX\n");
emitline("\tPOPQ\tCX\n");
if (n.op == tkind.TK_PLUSEQ) { emitline("\tADDQ\tCX, AX\n"); };
if (n.op == tkind.TK_MINUSEQ) { emitline("\tSUBQ\tCX, AX\n"); };
if (n.op == tkind.TK_STAREQ) { emitline("\tIMULQ\tCX, AX\n"); };
if (n.op == tkind.TK_AMPEQ) { emitline("\tANDQ\tCX, AX\n"); };
if (n.op == tkind.TK_PIPEEQ) { emitline("\tORQ\tCX, AX\n"); };
if (n.op == tkind.TK_CARETEQ) { emitline("\tXORQ\tCX, AX\n"); };
let sop2: str = fieldstoreop(c, fi);
emitline("\t");
emitline(sop2);
emitline("\tAX, ");
emitdispreg(fi.foff: i64, "BX");
emitline("\n");
return;
};
fi = fi.finext;
};
};
};
};};
};
};};
};
};
// Struct/ptr-to-struct field assignment: `s.f = expr;` or
// `p.f = expr;`. Only plain `=` is wired (compound on field
// is rare and not yet needed by our fixtures).