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w6c: chained-DOT struct field-copy tail uses 4/2/1 ladder, not over-MOVQ (#9)

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The depth->=2 chained `t.m.l = s` struct-ident field copy selected its tail with (tail==4)?MOVL:(tail==1?MOVB:MOVQ), so every tail in {2,3,5,6,7} fell to an 8-byte MOVQ that over-wrote past the destination field — clobbering a @packed neighbour (t.m.l=s wrote s's slop over t.m.z: cstage exit 0 vs wwstage's correct 222) and diverging cs!=ww gate-blind. Replace with a descending 4/2/1 MOVL/MOVW/MOVB ladder comparing to ssz (the field's natural type-table size), aligning cstage UP to wwstage's sized ladder + cg_aggcopy. New table-driven gate 949_chained_dot_struct_copy_run (7 sizes x runtime-exit oracle on both drivers + cs==ww byte-id; negative-control proven).
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Hojun-Cho
2026-06-19 13:41:44 +09:00
parent 1466f50a09
commit 801d105c0f
3 changed files with 386 additions and 7 deletions
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7
Makefile
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@@ -595,6 +595,7 @@ TESTS = $(BIN)/test_smoke $(BIN)/test_lex $(BIN)/test_parse $(BIN)/test_check \
$(BIN)/test_valstruct_subsize_run \
$(BIN)/test_aggret_source_run \
$(BIN)/test_oddstruct_byval_ret_run \
$(BIN)/test_chained_dot_struct_copy_run \
$(BIN)/test_continue_run \
$(BIN)/test_callret_unsigned_arith_run \
$(BIN)/test_sar_shr_run \
@@ -3425,6 +3426,12 @@ $(BIN)/test_oddstruct_byval_ret_run: test/wcc/949_oddstruct_byval_ret_run.c \
$(LIB)/libwwrt.a | $(BIN)
$(CC) $(CFLAGS) -o $@ $<
$(BIN)/test_chained_dot_struct_copy_run: test/wcc/949_chained_dot_struct_copy_run.c \
$(BIN)/ww $(BIN)/w6c $(BIN)/w6a $(BIN)/w6l \
$(BIN)/ww_ww $(BIN)/w6c_ww $(BIN)/w6a_ww $(BIN)/w6l_ww \
$(LIB)/libwwrt.a | $(BIN)
$(CC) $(CFLAGS) -o $@ $<
$(BIN)/test_continue_run: test/wcc/911_continue_run.c $(BIN)/ww \
$(BIN)/w6c $(BIN)/w6c_ww $(BIN)/w6a $(BIN)/w6l \
$(LIB)/libwwrt.a | $(BIN)