From 49079911ba45098a7d3f910bb4bf0e0bcc9dad49 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Mon, 15 Feb 2016 05:15:33 +0000
Subject: [PATCH] bignum.c: micro optimization

* bignum.c (rb_big_uminus, bigsub_int): use BIGNUM_NEGATE.

* internal.h (BIGNUM_NEGATE): simplify negation.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53832 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 bignum.c   | 6 +++---
 internal.h | 1 +
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/bignum.c b/bignum.c
index 8f79713682..1f9dfb56aa 100644
--- a/bignum.c
+++ b/bignum.c
@@ -5526,7 +5526,7 @@ rb_big_uminus(VALUE x)
 {
     VALUE z = rb_big_clone(x);
 
-    BIGNUM_SET_SIGN(z, !BIGNUM_SIGN(x));
+    BIGNUM_NEGATE(z);
 
     return bignorm(z);
 }
@@ -5624,7 +5624,7 @@ bigsub_int(VALUE x, long y0)
     assert(xn == zn);
     num = (BDIGIT_DBL_SIGNED)xds[0] - y;
     if (xn == 1 && num < 0) {
-	BIGNUM_SET_SIGN(z, !BIGNUM_SIGN(x));
+	BIGNUM_NEGATE(z);
 	zds[0] = (BDIGIT)-num;
 	RB_GC_GUARD(x);
 	return bignorm(z);
@@ -5687,7 +5687,7 @@ bigsub_int(VALUE x, long y0)
     assert(num == 0 || num == -1);
     if (num < 0) {
         get2comp(z);
-	BIGNUM_SET_SIGN(z, !BIGNUM_SIGN(x));
+	BIGNUM_NEGATE(z);
     }
     RB_GC_GUARD(x);
     return bignorm(z);
diff --git a/internal.h b/internal.h
index 637ef1619b..949c6f8a42 100644
--- a/internal.h
+++ b/internal.h
@@ -364,6 +364,7 @@ struct RBignum {
           : (RBASIC(b)->flags &= ~BIGNUM_SIGN_BIT))
 #define BIGNUM_POSITIVE_P(b) BIGNUM_SIGN(b)
 #define BIGNUM_NEGATIVE_P(b) (!BIGNUM_SIGN(b))
+#define BIGNUM_NEGATE(b) (RBASIC(b)->flags ^= BIGNUM_SIGN_BIT)
 
 #define BIGNUM_EMBED_FLAG FL_USER2
 #define BIGNUM_EMBED_LEN_MASK (FL_USER5|FL_USER4|FL_USER3)