From 4d7469b610814d2ebb1e89aebebdeb68abfe7f4e Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Mon, 7 Apr 2008 15:41:47 -0300
Subject: avoid constant folding for -0 (to avoid it colapsing to 0)
---
lcode.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/lcode.c b/lcode.c
index 96ef6b96..12a69362 100644
--- a/lcode.c
+++ b/lcode.c
@@ -1,5 +1,5 @@
/*
-** $Id: lcode.c,v 2.34 2007/05/04 18:41:49 roberto Exp roberto $
+** $Id: lcode.c,v 2.35 2008/04/02 16:16:06 roberto Exp roberto $
** Code generator for Lua
** See Copyright Notice in lua.h
*/
@@ -696,8 +696,8 @@ void luaK_prefix (FuncState *fs, UnOpr op, expdesc *e) {
e2.t = e2.f = NO_JUMP; e2.k = VKNUM; e2.u.nval = 0;
switch (op) {
case OPR_MINUS: {
- if (isnumeral(e)) /* -constant? */
- e->u.nval = luai_numunm(NULL, e->u.nval);
+ if (isnumeral(e) && e->u.nval != 0) /* minus non-zero constant? */
+ e->u.nval = luai_numunm(NULL, e->u.nval); /* fold it */
else {
luaK_exp2anyreg(fs, e);
codearith(fs, OP_UNM, e, &e2);
--
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