xref: /openbsd/gnu/usr.bin/perl/t/op/hexfp.t (revision 097a140d) 
1#!./perl
2
3BEGIN {
4    chdir 't' if -d 't';
5    require './test.pl';
6    set_up_inc('../lib');
7}
8
9use strict;
10
11use Config;
12
13plan(tests => 125);
14
15# Test hexfloat literals.
16
17is(0x0p0, 0);
18is(0x0.p0, 0);
19is(0x.0p0, 0);
20is(0x0.0p0, 0);
21is(0x0.00p0, 0);
22
23is(0x1p0, 1);
24is(0x1.p0, 1);
25is(0x1.0p0, 1);
26is(0x1.00p0, 1);
27
28is(0x2p0, 2);
29is(0x2.p0, 2);
30is(0x2.0p0, 2);
31is(0x2.00p0, 2);
32
33is(0x1p1, 2);
34is(0x1.p1, 2);
35is(0x1.0p1, 2);
36is(0x1.00p1, 2);
37
38is(0x.1p0, 0.0625);
39is(0x0.1p0, 0.0625);
40is(0x0.10p0, 0.0625);
41is(0x0.100p0, 0.0625);
42
43is(0x.1p0, 0.0625);
44is(0x1.1p0, 1.0625);
45is(0x1.11p0, 1.06640625);
46is(0x1.111p0, 1.066650390625);
47
48# Positive exponents.
49is(0x1p2, 4);
50is(0x1p+2, 4);
51is(0x0p+0, 0);
52
53# Negative exponents.
54is(0x1p-1, 0.5);
55is(0x1.p-1, 0.5);
56is(0x1.0p-1, 0.5);
57is(0x0p-0, 0);
58
59is(0x1p+2, 4);
60is(0x1p-2, 0.25);
61
62is(0x3p+2, 12);
63is(0x3p-2, 0.75);
64
65# Shifting left.
66is(0x1p2, 1 << 2);
67is(0x1p3, 1 << 3);
68is(0x3p4, 3 << 4);
69is(0x3p5, 3 << 5);
70is(0x12p23, 0x12 << 23);
71
72# Shifting right.
73is(0x1p-2, 1 / (1 << 2));
74is(0x1p-3, 1 / (1 << 3));
75is(0x3p-4, 3 / (1 << 4));
76is(0x3p-5, 3 / (1 << 5));
77is(0x12p-23, 0x12 / (1 << 23));
78
79# Negative sign.
80is(-0x1p+2, -4);
81is(-0x1p-2, -0.25);
82is(-0x0p+0, 0);
83is(-0x0p-0, 0);
84
85is(0x0.10p0, 0.0625);
86is(0x0.1p0, 0.0625);
87is(0x.1p0, 0.0625);
88
89is(0x12p+3, 144);
90is(0x12p-3, 2.25);
91
92# Hexdigits (lowercase).
93is(0x9p+0, 9);
94is(0xap+0, 10);
95is(0xfp+0, 15);
96is(0x10p+0, 16);
97is(0x11p+0, 17);
98is(0xabp+0, 171);
99is(0xab.cdp+0, 171.80078125);
100
101# Uppercase hexdigits and exponent prefix.
102is(0xAp+0, 10);
103is(0xFp+0, 15);
104is(0xABP+0, 171);
105is(0xAB.CDP+0, 171.80078125);
106
107# Underbars.
108is(0xa_b.c_dp+1_2, 703696);
109
110# Note that the hexfloat representation is not unique since the
111# exponent can be shifted, and the hexdigits with it: this is no
112# different from 3e4 cf 30e3 cf 30000.  The shifting of the hexdigits
113# makes it look stranger, though: 0xap1 == 0x5p2.
114
115# [perl #127183], try some non-canonical forms.
116SKIP: {
117    skip("nv_preserves_uv_bits is $Config{nv_preserves_uv_bits} not 53", 3)
118        unless ($Config{nv_preserves_uv_bits} == 53);
119    is(0x0.b17217f7d1cf78p0, 0x1.62e42fefa39efp-1);
120    is(0x0.58b90bfbe8e7bcp1, 0x1.62e42fefa39efp-1);
121    is(0x0.2c5c85fdf473dep2, 0x1.62e42fefa39efp-1);
122}
123
124# Needs to use within() instead of is() because of long doubles.
125within(0x1.99999999999ap-4, 0.1, 1e-9);
126within(0x3.333333333333p-5, 0.1, 1e-9);
127within(0xc.cccccccccccdp-7, 0.1, 1e-9);
128
129my $warn;
130
131local $SIG{__WARN__} = sub { $warn = shift };
132
133sub get_warn() {
134    my $save = $warn;
135    undef $warn;
136    return $save;
137}
138
139{ # Test certain things that are not hexfloats and should stay that way.
140    eval '0xp3';
141    like(get_warn(), qr/Missing operator before p3/);
142
143    eval '5p3';
144    like(get_warn(), qr/Missing operator before p3/);
145
146    my @a;
147    eval '@a = 0x3..5';
148    is("@a", "3 4 5");
149
150    undef $a;
151    eval '$a = eval "0x.3"';
152    is($a, undef); # throws an error
153
154    undef $a;
155    eval '$a = eval "0xc.3"';
156    is($a, '123');
157
158    undef $a;
159    eval '$a = eval "0x.p3"';
160    is($a, undef);
161}
162
163# Test warnings.
164SKIP:
165{
166    skip "nv_preserves_uv_bits is $Config{nv_preserves_uv_bits} not 53", 26
167        unless $Config{nv_preserves_uv_bits} == 53;
168
169    local $^W = 1;
170
171    eval '0x1_0000_0000_0000_0p0';
172    is(get_warn(), undef);
173
174    eval '0x2_0000_0000_0000_0p0';
175    like(get_warn(), qr/^Hexadecimal float: mantissa overflow/);
176
177    eval '0x1.0000_0000_0000_0p0';
178    is(get_warn(), undef);
179
180    eval '0x2.0000_0000_0000_0p0';
181    like(get_warn(), qr/^Hexadecimal float: mantissa overflow/);
182
183    eval '0x.1p-1021';
184    is(get_warn(), undef);
185
186    eval '0x.1p-1023';
187    like(get_warn(), qr/^Hexadecimal float: exponent underflow/);
188
189    eval '0x1.fffffffffffffp+1023';
190    is(get_warn(), undef);
191
192    eval '0x1.fffffffffffffp+1024';
193    like(get_warn(), qr/^Hexadecimal float: exponent overflow/);
194
195    undef $a;
196    eval '$a = 0x111.0000000000000p+0'; # 12 zeros.
197    like(get_warn(), qr/^Hexadecimal float: mantissa overflow/);
198    is($a, 273);
199
200    # The 13 zeros would be enough to push the hi-order digits
201    # off the high-end.
202
203    undef $a;
204    eval '$a = 0x111.0000000000000p+0'; # 13 zeros.
205    like(get_warn(), qr/^Hexadecimal float: mantissa overflow/);
206    is($a, 273);
207
208    undef $a;
209    eval '$a = 0x111.00000000000000p+0'; # 14 zeros.
210    like(get_warn(), qr/^Hexadecimal float: mantissa overflow/);
211    is($a, 273);
212
213    undef $a;
214    eval '$a = 0xfffffffffffffp0'; # 52 bits.
215    is(get_warn(), undef);
216    is($a, 4.5035996273705e+15);
217
218    undef $a;
219    eval '$a = 0xfffffffffffff.8p0'; # 53 bits.
220    is(get_warn(), undef);
221    is($a, 4.5035996273705e+15);
222
223    undef $a;
224    eval '$a = 0xfffffffffffff.cp0'; # 54 bits.
225    like(get_warn(), qr/^Hexadecimal float: mantissa overflow/);
226    is($a, 4.5035996273705e+15);
227
228    undef $a;
229    eval '$a = 0xf.ffffffffffffp0'; # 52 bits.
230    is(get_warn(), undef);
231    is($a, 16);
232
233    undef $a;
234    eval '$a = 0xf.ffffffffffff8p0'; # 53 bits.
235    is(get_warn(), undef);
236    is($a, 16);
237
238    undef $a;
239    eval '$a = 0xf.ffffffffffffcp0'; # 54 bits.
240    like(get_warn(), qr/^Hexadecimal float: mantissa overflow/);
241    is($a, 16);
242}
243
244# [perl #128919] limited exponent range in hex fp literal with long double
245SKIP: {
246    skip("non-80-bit-long-double", 4)
247        unless ($Config{uselongdouble} &&
248		($Config{nvsize} == 16 || $Config{nvsize} == 12) &&
249		($Config{long_double_style_ieee_extended}));
250    is(0x1p-1074,  4.94065645841246544e-324);
251    is(0x1p-1075,  2.47032822920623272e-324, '[perl #128919]');
252    is(0x1p-1076,  1.23516411460311636e-324);
253    is(0x1p-16445, 3.6451995318824746e-4951);
254}
255
256# [perl #131894] parsing long binaryish floating point literals used to
257# perform illegal bit shifts.  Need 64-bit ints to test.
258SKIP: {
259    skip("non-64-bit NVs or no 64-bit ints to test with", 3)
260      unless $Config{nvsize} == 8 && $Config{d_double_style_ieee} && $Config{use64bitint};
261    is sprintf("%a", eval("0x030000000000000.1p0")), "0x1.8p+53";
262    is sprintf("%a", eval("01400000000000000000.1p0")), "0x1.8p+54";
263    is sprintf("%a", eval("0b110000000000000000000000000000000000000000000000000000000.1p0")), "0x1.8p+56";
264}
265
266# the implementation also allow for octal and binary fp
267is(01p0, 1);
268is(01.0p0, 1);
269is(01.00p0, 1);
270is(010.1p0, 8.125);
271is(00.400p1, 1);
272is(00p0, 0);
273is(01.1p0, 1.125);
274
275is(0b0p0, 0);
276is(0b1p0, 1);
277is(0b10p0, 2);
278is(0b1.1p0, 1.5);
279
280# previously these would pass "0x..." to the overload instead of the appropriate
281# "0b" or "0" prefix.
282fresh_perl_is(<<'CODE', "1", {}, "overload binary fp");
283use overload;
284BEGIN { overload::constant float => sub { return eval $_[0]; }; }
285print 0b0.1p1;
286CODE
287
288fresh_perl_is(<<'CODE', "1", {}, "overload octal fp");
289use overload;
290BEGIN { overload::constant float => sub { return eval $_[0]; }; }
291print 00.1p3;
292CODE
293
294# sprintf %a/%A testing is done in sprintf2.t,
295# trickier than necessary because of long doubles,
296# and because looseness of the spec.
297