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langref: be clear that float types are always IEEE 754

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This commit is contained in:
Andrew Kelley 2018-06-16 19:53:52 -04:00
parent a7d59086b4
commit eae9634ac9
1 changed files with 24 additions and 3 deletions
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27
doc/langref.html.in
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@ -370,17 +370,17 @@ pub fn main() void {
<tr>
<td><code>f32</code></td>
<td><code>float</code></td>
<td>32-bit floating point (23-bit mantissa)</td>
<td>32-bit floating point (23-bit mantissa) IEEE-754-2008 binary32</td>
</tr>
<tr>
<td><code>f64</code></td>
<td><code>double</code></td>
<td>64-bit floating point (52-bit mantissa)</td>
<td>64-bit floating point (52-bit mantissa) IEEE-754-2008 binary64</td>
</tr>
<tr>
<td><code>f128</code></td>
<td>(none)</td>
<td>128-bit floating point (112-bit mantissa)</td>
<td>128-bit floating point (112-bit mantissa) IEEE-754-2008 binary128</td>
</tr>
<tr>
<td><code>bool</code></td>
@ -407,6 +407,16 @@ pub fn main() void {
<td>(none)</td>
<td>an error code</td>
</tr>
<tr>
<td><code>comptime_int</code></td>
<td>(none)</td>
<td>Only allowed for {#link|comptime#}-known values. The type of integer literals.</td>
</tr>
<tr>
<td><code>comptime_float</code></td>
<td>(none)</td>
<td>Only allowed for {#link|comptime#}-known values. The type of float literals.</td>
</tr>
</table>
</div>
{#see_also|Integers|Floats|void|Errors#}
@ -642,7 +652,18 @@ fn divide(a: i32, b: i32) i32 {
{#header_close#}
{#header_close#}
{#header_open|Floats#}
<p>Zig has the following floating point types:</p>
<ul>
<li><code>f32</code> - IEEE-754-2008 binary32</li>
<li><code>f64</code> - IEEE-754-2008 binary64</li>
<li><code>f128</code> - IEEE-754-2008 binary128</li>
<li><code>c_longdouble</code> - matches <code>long double</code> for the target C ABI</li>
</ul>
{#header_open|Float Literals#}
<p>
Float literals have type <code>comptime_float</code> which is guaranteed to hold at least all possible values
that the largest other floating point type can hold. Float literals implicitly cast to any other type.
</p>
{#code_begin|syntax#}
const floating_point = 123.0E+77;
const another_float = 123.0;