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using 'volatile' in 'tofloat' to ensure result has the same precision

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(lua_Number) of other computations
This commit is contained in:
Roberto Ierusalimschy 2014-04-08 11:28:04 -03:00
parent 4a24883674
commit c7859a046d
1 changed files with 7 additions and 4 deletions
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11
lvm.c
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@ -1,5 +1,5 @@
/*
** $Id: lvm.c,v 2.192 2014/03/31 19:18:24 roberto Exp roberto $
** $Id: lvm.c,v 2.193 2014/04/02 16:54:20 roberto Exp roberto $
** Lua virtual machine
** See Copyright Notice in lua.h
*/
@ -38,12 +38,15 @@
/*
** Similar to 'tonumber', but does not attempt to convert strings.
** Used in comparisons.
** Similar to 'tonumber', but does not attempt to convert strings and
** ensure correct precision (no extra bits). Used in comparisons.
*/
static int tofloat (const TValue *obj, lua_Number *n) {
if (ttisfloat(obj)) *n = fltvalue(obj);
else if (ttisinteger(obj)) *n = cast_num(ivalue(obj));
else if (ttisinteger(obj)) {
volatile lua_Number x = cast_num(ivalue(obj)); /* avoid extra precision */
*n = x;
}
else {
*n = 0; /* to avoid warnings */
return 0;