prefer IV/UV over NV in sv_2pv().
p4raw-id: //depot/cfgperl@5329
=item *
-in basic arithmetics: + - * / %
+in basic arithmetics: + - * / % (NOTE: operating close to the limits
+of the integer values may produce surprising results)
=item *
-vec() (but see the below note about bit arithmetics)
+in bit arithmetics: & | ^ ~ << >> (NOTE: these used to be forced
+to be 32 bits wide.)
+
+=item *
+
+vec()
=back
Note that unless you have the case (a) you will have to configure
and compile Perl using the -Duse64bitint Configure flag.
-Unfortunately bit arithmetics (&, |, ^, ~, <<, >>) for numbers are not
-64-bit clean, they are explictly forced to be 32-bit because of
-tangled backward compatibility issues. This limitation is subject to
-change. Bit arithmetics for bit vector scalars (created by vec()) are
-not limited in their width, you can use the & | ^ ~ operators on such
-scalars.
-
There are actually two modes of 64-bitness: the first one is achieved
using Configure -Duse64bitint and the second one using Configure
-Duse64bitall. The difference is that the first one is minimal and
is returned. One effect of these rules is that C<-bareword> is equivalent
to C<"-bareword">.
-Unary "~" performs bitwise negation, i.e., 1's complement. For example,
-C<0666 &~ 027> is 0640. (See also L<Integer Arithmetic> and L<Bitwise
-String Operators>.)
+Unary "~" performs bitwise negation, i.e., 1's complement. For
+example, C<0666 & ~027> is 0640. (See also L<Integer Arithmetic> and
+L<Bitwise String Operators>.) Note that the width of the result is
+platform-dependent: ~0 is 32 bits wide on a 32-bit platform, but 64
+bits wide on a 64-bit platform, so if you are expecting a certain bit
+width, remember use the & operator to mask off the excess bits.
Unary "+" has no effect whatsoever, even on strings. It is useful
syntactically for separating a function name from a parenthesized expression
#endif
/*
- * Types used in bitwise operations.
- *
- * Normally we'd just use IV and UV. However, some hardware and
- * software combinations (e.g. Alpha and current OSF/1) don't have a
- * floating-point type to use for NV that has adequate bits to fully
- * hold an IV/UV. (In other words, sizeof(long) == sizeof(double).)
- *
- * It just so happens that "int" is the right size almost everywhere.
- */
-typedef int IBW;
-typedef unsigned UBW;
-
-/*
- * Mask used after bitwise operations.
- *
- * There is at least one realm (Cray word machines) that doesn't
- * have an integral type (except char) small enough to be represented
- * in a double without loss; that is, it has no 32-bit type.
- */
-#if LONGSIZE > 4 && defined(_CRAY)
-# define BW_BITS 32
-# define BW_MASK ((1 << BW_BITS) - 1)
-# define BW_SIGN (1 << (BW_BITS - 1))
-# define BWi(i) (((i) & BW_SIGN) ? ((i) | ~BW_MASK) : ((i) & BW_MASK))
-# define BWu(u) ((u) & BW_MASK)
-#else
-# define BWi(i) (i)
-# define BWu(u) (u)
-#endif
-
-/*
* Offset for integer pack/unpack.
*
* On architectures where I16 and I32 aren't really 16 and 32 bits,
{
djSP; dATARGET; tryAMAGICbin(lshift,opASSIGN);
{
- IBW shift = POPi;
+ IV shift = POPi;
if (PL_op->op_private & HINT_INTEGER) {
- IBW i = TOPi;
- i = BWi(i) << shift;
- SETi(BWi(i));
+ IV i = TOPi;
+ SETi(i << shift);
}
else {
- UBW u = TOPu;
- u <<= shift;
- SETu(BWu(u));
+ UV u = TOPu;
+ SETu(u << shift);
}
RETURN;
}
{
djSP; dATARGET; tryAMAGICbin(rshift,opASSIGN);
{
- IBW shift = POPi;
+ IV shift = POPi;
if (PL_op->op_private & HINT_INTEGER) {
- IBW i = TOPi;
- i = BWi(i) >> shift;
- SETi(BWi(i));
+ IV i = TOPi;
+ SETi(i >> shift);
}
else {
- UBW u = TOPu;
- u >>= shift;
- SETu(BWu(u));
+ UV u = TOPu;
+ SETu(u >> shift);
}
RETURN;
}
dPOPTOPssrl;
if (SvNIOKp(left) || SvNIOKp(right)) {
if (PL_op->op_private & HINT_INTEGER) {
- IBW value = SvIV(left) & SvIV(right);
- SETi(BWi(value));
+ IV i = SvIV(left) & SvIV(right);
+ SETi(i);
}
else {
- UBW value = SvUV(left) & SvUV(right);
- SETu(BWu(value));
+ UV u = SvUV(left) & SvUV(right);
+ SETu(u);
}
}
else {
dPOPTOPssrl;
if (SvNIOKp(left) || SvNIOKp(right)) {
if (PL_op->op_private & HINT_INTEGER) {
- IBW value = (USE_LEFT(left) ? SvIV(left) : 0) ^ SvIV(right);
- SETi(BWi(value));
+ IV i = (USE_LEFT(left) ? SvIV(left) : 0) ^ SvIV(right);
+ SETi(i);
}
else {
- UBW value = (USE_LEFT(left) ? SvUV(left) : 0) ^ SvUV(right);
- SETu(BWu(value));
+ UV u = (USE_LEFT(left) ? SvUV(left) : 0) ^ SvUV(right);
+ SETu(u);
}
}
else {
dPOPTOPssrl;
if (SvNIOKp(left) || SvNIOKp(right)) {
if (PL_op->op_private & HINT_INTEGER) {
- IBW value = (USE_LEFT(left) ? SvIV(left) : 0) | SvIV(right);
- SETi(BWi(value));
+ IV i = (USE_LEFT(left) ? SvIV(left) : 0) | SvIV(right);
+ SETi(i);
}
else {
- UBW value = (USE_LEFT(left) ? SvUV(left) : 0) | SvUV(right);
- SETu(BWu(value));
+ UV u = (USE_LEFT(left) ? SvUV(left) : 0) | SvUV(right);
+ SETu(u);
}
}
else {
dTOPss;
if (SvNIOKp(sv)) {
if (PL_op->op_private & HINT_INTEGER) {
- IBW value = ~SvIV(sv);
- SETi(BWi(value));
+ IV i = ~SvIV(sv);
+ SETi(i);
}
else {
- UBW value = ~SvUV(sv);
- SETu(BWu(value));
+ UV u = ~SvUV(sv);
+ SETu(u);
}
}
else {
DIE(aTHX_ "Cannot compress negative numbers");
if (
-#ifdef BW_BITS
- adouble <= BW_MASK
-#else
#ifdef CXUX_BROKEN_CONSTANT_CONVERT
adouble <= UV_MAX_cxux
#else
adouble <= UV_MAX
#endif
-#endif
)
{
char buf[1 + sizeof(UV)];
return "";
}
}
- if (SvNOKp(sv)) { /* See note in sv_2uv() */
- /* XXXX 64-bit? IV may have better precision... */
- /* I tried changing this for to be 64-bit-aware and
- * the t/op/numconvert.t became very, very, angry.
- * --jhi Sep 1999 */
+ if (SvIOKp(sv)) {
+ I32 isIOK = SvIOK(sv);
+ I32 isUIOK = SvIsUV(sv);
+ char buf[TYPE_CHARS(UV)];
+ char *ebuf, *ptr;
+
+ if (SvTYPE(sv) < SVt_PVIV)
+ sv_upgrade(sv, SVt_PVIV);
+ if (isUIOK)
+ ptr = uiv_2buf(buf, 0, SvUVX(sv), 1, &ebuf);
+ else
+ ptr = uiv_2buf(buf, SvIVX(sv), 0, 0, &ebuf);
+ SvGROW(sv, ebuf - ptr + 1); /* inlined from sv_setpvn */
+ Move(ptr,SvPVX(sv),ebuf - ptr,char);
+ SvCUR_set(sv, ebuf - ptr);
+ s = SvEND(sv);
+ *s = '\0';
+ if (isIOK)
+ SvIOK_on(sv);
+ else
+ SvIOKp_on(sv);
+ if (isUIOK)
+ SvIsUV_on(sv);
+ SvPOK_on(sv);
+ }
+ else if (SvNOKp(sv)) { /* See note in sv_2uv() */
if (SvTYPE(sv) < SVt_PVNV)
sv_upgrade(sv, SVt_PVNV);
SvGROW(sv, 28);
*--s = '\0';
#endif
}
- else if (SvIOKp(sv)) {
- U32 isIOK = SvIOK(sv);
- U32 isUIOK = SvIsUV(sv);
- char buf[TYPE_CHARS(UV)];
- char *ebuf, *ptr;
-
- if (SvTYPE(sv) < SVt_PVIV)
- sv_upgrade(sv, SVt_PVIV);
- if (isUIOK)
- ptr = uiv_2buf(buf, 0, SvUVX(sv), 1, &ebuf);
- else
- ptr = uiv_2buf(buf, SvIVX(sv), 0, 0, &ebuf);
- SvGROW(sv, ebuf - ptr + 1); /* inlined from sv_setpvn */
- Move(ptr,SvPVX(sv),ebuf - ptr,char);
- SvCUR_set(sv, ebuf - ptr);
- s = SvEND(sv);
- *s = '\0';
- if (isIOK)
- SvIOK_on(sv);
- else
- SvIOKp_on(sv);
- if (isUIOK)
- SvIsUV_on(sv);
- SvPOK_on(sv);
- }
else {
dTHR;
if (ckWARN(WARN_UNINITIALIZED)
goto uns_integer;
case 'X':
+ /* FALL THROUGH */
case 'x':
base = 16;
# See the beginning of pp.c and the explanation next to IBW/UBW.
# so that using > 0xfffffff constants and
-# 32+ bit vector sizes doesn't cause noise
+# 32+ bit integers don't cause noise
no warnings qw(overflow portable);
-print "1..34\n";
+print "1..42\n";
my $q = 12345678901;
my $r = 23456789012;
print "not " unless vec($x, 0, 64) == 0 && vec($x, 2, 64) == 0;
print "ok 34\n";
+
+print "not " unless ~0 == 0xffffffffffffffff;
+print "ok 35\n";
+
+print "not " unless (0xffffffff<<32) == 0xffffffff00000000;
+print "ok 36\n";
+
+print "not " unless ((0xffffffff)<<32)>>32 == 0xffffffff;
+print "ok 37\n";
+
+print "not " unless 1<<63 == 0x8000000000000000;
+print "ok 38\n";
+
+print "not " unless (sprintf "%#Vx", 1<<63) eq '0x8000000000000000';
+print "ok 39\n";
+
+print "not " unless (0x8000000000000000 | 1) == 0x8000000000000001;
+print "ok 40\n";
+
+print "not " unless (0xf000000000000000 & 0x8000000000000000) == 0x8000000000000000;
+print "ok 41\n";
+
+print "not " unless (0xf000000000000000 ^ 0xfffffffffffffff0) == 0x0ffffffffffffff0;
+print "ok 42\n";
+
# eof
EXPECT
a := b := c
########
+use integer;
$cusp = ~0 ^ (~0 >> 1);
$, = " ";
print +($cusp - 1) % 8, $cusp % 8, -$cusp % 8, ($cusp + 1) % 8, "!\n";
EXPECT
-7 0 0 1 !
+-1 0 0 1 !
########
$foo=undef; $foo->go;
EXPECT
my $max_uv2 = sprintf "%u", $max_uv1 ** 6; # 6 is an arbitrary number here
my $big_iv = do {use integer; $max_uv1 * 16}; # 16 is an arbitrary number here
+print "# max_uv1 = $max_uv1, max_uv2 = $max_uv2, big_iv = $big_iv\n";
if ($max_uv1 ne $max_uv2 or $big_iv > $max_uv1) {
- # see perldelta.pod section 64-bit support
print "1..0\n# Unsigned arithmetic is not sane\n";
exit 0;
}
projects / p5sagit/p5-mst-13.2.git / commitdiff