From 47ce755193d18704ffaf9dc3e5953dd6966f1db1 Mon Sep 17 00:00:00 2001
From: "B. Watson" <yalhcru@gmail.com>
Date: Thu, 25 Mar 2021 15:14:25 -0400
Subject: Save 27 bytes

---
 bigfloat.s | 18 +++++++++---------
 bignum.h   |  2 ++
 taipan.c   |  9 +++++++++
 3 files changed, 20 insertions(+), 9 deletions(-)

diff --git a/bigfloat.s b/bigfloat.s
index d3115bc..2d30855 100644
--- a/bigfloat.s
+++ b/bigfloat.s
@@ -3,7 +3,7 @@
  .importzp ptr3, sreg
  .import popeax, popax, pushax, _memcmp
  .export _ulong_to_big, _big_to_ulong, _big_add, _big_sub, _big_mul, _big_div
- .export _bank_maxed_out, _big_cmp, _big_copy, _big_negate
+ .export _bank_maxed_out, _big_cmp, _big_copy  ;, _big_negate
 
  .include "atari.inc"
 
@@ -93,14 +93,14 @@ fptemp_to_fr1:
 ; void __fastcall__ big_negate(bignump b);
 ; This doesn't call the ROM or use FR0/FR1, it just inverts the sign
 ; bit in-place.
-_big_negate:
- sta ptr3
- stx ptr3+1
- ldy #0
- lda (ptr3),y
- eor #$80
- sta (ptr3),y
- rts
+;_big_negate:
+; sta ptr3
+; stx ptr3+1
+; ldy #0
+; lda (ptr3),y
+; eor #$80
+; sta (ptr3),y
+; rts
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ; truncate FR0 to integer (no rounding: 2.8 -> 2)
diff --git a/bignum.h b/bignum.h
index 06fbd8b..4eed63e 100644
--- a/bignum.h
+++ b/bignum.h
@@ -89,7 +89,9 @@ extern char __cdecl__ big_mul(bignump dest, bignump multiplicand, bignump multip
 extern char __cdecl__ big_div(bignump dest, bignump dividend, bignump divisor);
 
 /* negation: b = -b, or b *= -1 */
+#if BIGNUM != BIGFLOAT
 extern void __fastcall__ big_negate(bignump b);
+#endif
 
 /* returns true if the bank is maxed out. We do this by checking the exponent
 	byte, so the "max" is tied to the bignum implementation, which is why its
diff --git a/taipan.c b/taipan.c
index d1cb8ed..d7aa888 100644
--- a/taipan.c
+++ b/taipan.c
@@ -616,10 +616,19 @@ void cprintfancy_big(bignump b) {
 
 	big_copy(tmp, b);
 
+	/* This is gross, but it saves 13 bytes here, plus another
+		14 because we can remove big_negate from bigfloat.s. */
+#if BIGNUM == BIGFLOAT
+	if(tmp[0] & 0x80) {
+		cputc('-');
+		tmp[0] ^= 0x80;
+	}
+#else
 	if(big_cmp(tmp, big0) < 0) {
 		cputc('-');
 		big_negate(tmp);
 	}
+#endif
 
 	if(big_cmp(tmp, big1T) >= 0) {
 		// inverse "1 Trillion+!":
-- 
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