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vm: add OP_ADDILV/OP_SUBILV for local variable increment

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fuse MOVE+ADDI+MOVE and MOVE+SUBI+MOVE patterns into single instructions.
ADDILV/SUBILV add/subtract an immediate to a local variable in-place.
BBB format: a=local, b=working space for method call, c=immediate.

saves 5 bytes per instance (9->4 bytes), 40 occurrences in stdlib.

Co-authored-by: Claude <noreply@anthropic.com>
This commit is contained in:
Yukihiro "Matz" Matsumoto
2026-01-19 22:06:41 +09:00
parent 724a2e2638
commit 5475ea573a
4 changed files with 63 additions and 3 deletions
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src/codedump.c
+8
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@@ -444,6 +444,14 @@ codedump(mrb_state *mrb, const mrb_irep *irep, FILE *out)
fprintf(out, "SUBI\t\tR%d\t%d", a, b);
print_lv_a(mrb, irep, a, out);
break;
CASE(OP_ADDILV, BBB):
fprintf(out, "ADDILV\tR%d\tR%d\t%d", a, b, c);
print_lv_a(mrb, irep, a, out);
break;
CASE(OP_SUBILV, BBB):
fprintf(out, "SUBILV\tR%d\tR%d\t%d", a, b, c);
print_lv_a(mrb, irep, a, out);
break;
CASE(OP_MUL, B):
fprintf(out, "MUL\t\tR%d\t(R%d)\n", a, a+1);
break;