Hojun-Cho
ab9de65b8e
A sub-slice base[lo:hi] advanced its data pointer by lo (element COUNT) instead of lo*esz (BYTES), so the base pointer was wrong for any esz>1 element. Pointer arithmetic is membsz-unit per the rt invariant (ref/hare/rt/ensure.ha:30); esz==1 (u8/str) is unchanged. Four emission sites, fixed byte-identically across stages (rule 10): - value path: cmd/w6c/cgen.c N_SLICE <-> cgenexpr.ww cgslice - call-arg: cmd/w6c/cgen.c:4646 <-> cgenutil.ww pushargsrev Scaling mirrors the cgindex idiom: esz from the type table (rule 13; cstage bu->sub->size, wwstage elemsizeofc) gated to an N_IDENT base, uniform IMULQ (no SHL special-case, no immediate form -- w6a is reg-reg only). The live lo reg is the multiplicand so the one free GP (DX value / BX arg) holds esz*lo; lo is preserved for len (hi-lo) and cap (base_cap-lo, #20). The esz==1 path keeps the single ADDQ, byte-identical to before (#75/#20/str unaffected). Non-ident bases stay unscaled in both stages (wwstage has no tnode there), tracked as a #76 residual alongside #74. New 943_subslice_ptresz_run: table-driven, dual-driver (ww/ww_ww), esz in {2,4,8} array+slice base, lo>0, let-form + call-arg form; asserts s[0]==base[lo] & s[1]==base[lo+1]. Fails on every fixture pre-fix on both stages, passes post-fix. Registered in Makefile (TESTS + target) so test/run builds and runs it.