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vm: fuse JMPIF and MATCHERR into conditional MATCHERR

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Change OP_MATCHERR from Z format (unconditional) to B format
(conditional on register). This allows fusing JMPIF + MATCHERR
sequence into a single MATCHERR instruction for simple patterns.

Before: JMPIF R2 target (4 bytes) + MATCHERR (1 byte) = 5 bytes
After:  MATCHERR R2 (2 bytes)

Saves 3 bytes per pattern match with raise_on_fail.

Co-authored-by: Claude <noreply@anthropic.com>
This commit is contained in:
Yukihiro "Matz" Matsumoto
2026-01-19 13:07:32 +09:00
parent 2fa99a73c2
commit dece8cb343
4 changed files with 22 additions and 8 deletions
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include/mruby/ops.h
+1 -1
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@@ -57,7 +57,7 @@ OPCODE(JMPUW, S) /* unwind_and_jump_to(a) */
OPCODE(EXCEPT, B) /* R[a] = exc */
OPCODE(RESCUE, BB) /* R[b] = R[a].isa?(R[b]) */
OPCODE(RAISEIF, B) /* raise(R[a]) if R[a] */
OPCODE(MATCHERR, Z) /* raise NoMatchingPatternError */
OPCODE(MATCHERR, B) /* raise NoMatchingPatternError unless R[a] */
OPCODE(SSEND, BBB) /* R[a] = self.send(Syms[b],R[a+1]..,R[a+n+1]:R[a+n+2]..) (c=n|k<<4) */
OPCODE(SSENDB, BBB) /* R[a] = self.send(Syms[b],R[a+1]..,R[a+n+1]:R[a+n+2]..,&R[a+n+2k+1]) */
OPCODE(SEND, BBB) /* R[a] = R[a].send(Syms[b],R[a+1]..,R[a+n+1]:R[a+n+2]..) (c=n|k<<4) */