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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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include/mruby/ops.h
+2
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@@ -78,6 +78,8 @@ OPCODE(ADD, B) /* R[a] = R[a]+R[a+1] */
OPCODE(ADDI, BB) /* R[a] = R[a]+mrb_int(b) */
OPCODE(SUB, B) /* R[a] = R[a]-R[a+1] */
OPCODE(SUBI, BB) /* R[a] = R[a]-mrb_int(b) */
OPCODE(ADDILV, BBB) /* R[a] = R[a]+mrb_int(c); R[b],R[b+1] for method call */
OPCODE(SUBILV, BBB) /* R[a] = R[a]-mrb_int(c); R[b],R[b+1] for method call */
OPCODE(MUL, B) /* R[a] = R[a]*R[a+1] */
OPCODE(DIV, B) /* R[a] = R[a]/R[a+1] */
OPCODE(EQ, B) /* R[a] = R[a]==R[a+1] */