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w6c+selfhost: cgen N_CAST signed narrow + peel !T on unsigned narrow

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TY_RUNE excluded — wwstage primsize skips it; task #5 will collapse
both gates back to symmetric once type_isunsigned recurses TY_ENUM.
This commit is contained in:
Hojun-Cho
2026-05-13 20:06:24 +09:00
parent 777c951fab
commit 388ab8a707
14 changed files with 421 additions and 32 deletions
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34
cmd/w6a/asm.c
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@@ -499,11 +499,39 @@ a_encode(Asm *a)
a_emit_byte(a, 0xBF);
emit_modrm_mem(a, rcode(p->to.type),
p->from.reg, p->from.offset);
} else if (p->from.type >= D_AX && p->from.type <= D_R15
&& p->to.type >= D_AX && p->to.type <= D_R15) {
emit_rex(a, rhi(p->to.type), rhi(p->from.type), 1);
a_emit_byte(a, 0x0F);
a_emit_byte(a, 0xBF);
a_emit_byte(a, modrm(3,
rcode(p->to.type), rcode(p->from.type)));
} else {
fprintf(stderr, "w6a: line %d: unsupported MOVSWQ shape\n", p->line);
a->errs++;
}
break;
case A_MOVSBQ:
/* MOVSX r64, r/m8 — 0F BE /r with REX.W */
if (p->from.type == D_INDIR
&& p->to.type >= D_AX && p->to.type <= D_R15) {
emit_rex(a, rhi(p->to.type), rhi(p->from.reg), 1);
a_emit_byte(a, 0x0F);
a_emit_byte(a, 0xBE);
emit_modrm_mem(a, rcode(p->to.type),
p->from.reg, p->from.offset);
} else if (p->from.type >= D_AX && p->from.type <= D_R15
&& p->to.type >= D_AX && p->to.type <= D_R15) {
emit_rex(a, rhi(p->to.type), rhi(p->from.type), 1);
a_emit_byte(a, 0x0F);
a_emit_byte(a, 0xBE);
a_emit_byte(a, modrm(3,
rcode(p->to.type), rcode(p->from.type)));
} else {
fprintf(stderr, "w6a: line %d: unsupported MOVSBQ shape\n", p->line);
a->errs++;
}
break;
case A_MOVB:
/* MOV r/m8, r8 — 88 /r. No REX.W. We always emit REX
* to allow access to SIL/DIL/BPL/SPL. */
@@ -574,6 +602,12 @@ a_encode(Asm *a)
a_emit_byte(a, 0x63);
emit_modrm_mem(a, rcode(p->to.type),
p->from.reg, p->from.offset);
} else if (p->from.type >= D_AX && p->from.type <= D_R15
&& p->to.type >= D_AX && p->to.type <= D_R15) {
emit_rex(a, rhi(p->to.type), rhi(p->from.type), 1);
a_emit_byte(a, 0x63);
a_emit_byte(a, modrm(3,
rcode(p->to.type), rcode(p->from.type)));
} else {
fprintf(stderr, "w6a: line %d: unsupported MOVSXD shape\n", p->line);
a->errs++;