From 8089fdadf0e95640059bfe627c44524bf68d459a Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Fri, 16 Jan 2026 17:11:43 +0900
Subject: [PATCH] bigint.c: inline usub_inplace() at call site

Function was only called once and contained just 2 lines of code.
Inlining directly reduces code size and improves clarity.

Co-authored-by: Claude <noreply@anthropic.com>
---
 mrbgems/mruby-bigint/core/bigint.c | 14 ++------------
 1 file changed, 2 insertions(+), 12 deletions(-)

diff --git a/mrbgems/mruby-bigint/core/bigint.c b/mrbgems/mruby-bigint/core/bigint.c
index d2dfde635..2f138c110 100644
--- a/mrbgems/mruby-bigint/core/bigint.c
+++ b/mrbgems/mruby-bigint/core/bigint.c
@@ -400,17 +400,6 @@ usub(mpz_t *z, mpz_t *y, mpz_t *x)
   z->sz = digits(z);
 }
 
-/* In-place unsigned subtraction: a -= b */
-/* Precondition: abs(a) >= abs(b), no allocation needed */
-static void
-usub_inplace(mpz_t *a, mpz_t *b)
-{
-  /* a->sz >= b->sz is guaranteed by precondition */
-  mpn_sub(a->p, a->p, a->sz, b->p, b->sz);
-  /* Normalize: find actual size after subtraction */
-  a->sz = digits(a);
-}
-
 /* compare abs(x) and abs(y) */
 static int
 ucmp(mpz_t *y, mpz_t *x)
@@ -605,7 +594,8 @@ mpz_sub(mpz_ctx_t *ctx, mpz_t *z, mpz_t *x, mpz_t *y)
 {
   /* In-place optimization: z == x, both positive, x >= y */
   if (z == x && x->sn > 0 && y->sn > 0 && ucmp(x, y) >= 0) {
-    usub_inplace(x, y);
+    mpn_sub(x->p, x->p, x->sz, y->p, y->sz);
+    x->sz = digits(x);
     if (x->sz == 0) x->sn = 0;
     return;
   }