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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.
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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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9
cmd/w6c/6.out.h
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@@ -51,10 +51,11 @@ enum {
A_MOVL,
A_MOVW,
A_MOVB,
A_MOVZBQ, /* movzx r64, r/m8 — load byte zero-extended */
A_MOVZWQ, /* movzx r64, r/m16 — load word zero-extended */
A_MOVSXD, /* movsxd r64, r/m32 — load i32 sign-extended */
A_MOVSWQ, /* movsx r64, r/m16 — load word sign-extended */
A_MOVZBQ, /* movzx r64, r/m8 — byte zero-extended */
A_MOVZWQ, /* movzx r64, r/m16 — word zero-extended */
A_MOVSXD, /* movsxd r64, r/m32 — i32 sign-extended */
A_MOVSWQ, /* movsx r64, r/m16 — i16 sign-extended */
A_MOVSBQ, /* movsx r64, r/m8 — i8 sign-extended */
/* SSE2 scalar double-precision float */
A_MOVSD, /* xmm/m → xmm and xmm → m */