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<a href='https://github.com/akkartik/mu/blob/master/408print-float.mu'>https://github.com/akkartik/mu/blob/master/408print-float.mu</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="muComment"># quick-n-dirty way to print out floats in hex</span>
<span id="L2" class="LineNr"> 2 </span>
<span id="L3" class="LineNr"> 3 </span><span class="muComment"># examples:</span>
<span id="L4" class="LineNr"> 4 </span><span class="muComment"># 0.5 = 0x3f000000 = 0011| 1111 | 0000 | 0000 | 0000 | 0000 | 0000 | 0000</span>
<span id="L5" class="LineNr"> 5 </span><span class="muComment"># = 0 | 01111110 | 00000000000000000000000</span>
<span id="L6" class="LineNr"> 6 </span><span class="muComment"># + exponent mantissa</span>
<span id="L7" class="LineNr"> 7 </span><span class="muComment"># = 0 | 00000000000000000000000 | 01111110</span>
<span id="L8" class="LineNr"> 8 </span><span class="muComment"># mantissa exponent</span>
<span id="L9" class="LineNr"> 9 </span><span class="muComment"># = 0 | 000000000000000000000000 | 01111110</span>
<span id="L10" class="LineNr"> 10 </span><span class="muComment"># zero-pad mantissa exponent</span>
<span id="L11" class="LineNr"> 11 </span><span class="muComment"># = +1.000000 P -01</span>
<span id="L12" class="LineNr"> 12 </span><span class="PreProc">fn</span> <span class="muTest"><a href='408print-float.mu.html#L12'>test-print-float-normal</a></span> <span class="Delimiter">{</span>
<span id="L13" class="LineNr"> 13 </span> <span class="PreProc">var</span> screen-on-stack: <a href='405screen.mu.html#L9'>screen</a>
<span id="L14" class="LineNr"> 14 </span> <span class="PreProc">var</span> <a href='405screen.mu.html#L9'>screen</a>/<span class="Constant">esi</span>: (addr <a href='405screen.mu.html#L9'>screen</a>) <span class="SpecialChar"><-</span> address screen-on-stack
<span id="L15" class="LineNr"> 15 </span> <a href='405screen.mu.html#L30'>initialize-screen</a> <a href='405screen.mu.html#L9'>screen</a>, <span class="Constant">5</span>, <span class="Constant">0x20</span> <span class="muComment"># 32 columns should be more than enough</span>
<span id="L16" class="LineNr"> 16 </span> <span class="muComment"># print 0.5</span>
<span id="L17" class="LineNr"> 17 </span> <span class="PreProc">var</span> one/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> copy <span class="Constant">1</span>
<span id="L18" class="LineNr"> 18 </span> <span class="PreProc">var</span> half/<span class="Constant">xmm0</span>: float <span class="SpecialChar"><-</span> convert one
<span id="L19" class="LineNr"> 19 </span> <span class="PreProc">var</span> two/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> copy <span class="Constant">2</span>
<span id="L20" class="LineNr"> 20 </span> <span class="PreProc">var</span> two-f/<span class="Constant">xmm1</span>: float <span class="SpecialChar"><-</span> convert two
<span id="L21" class="LineNr"> 21 </span> half <span class="SpecialChar"><-</span> divide two-f
<span id="L22" class="LineNr"> 22 </span> <a href='408print-float.mu.html#L92'>print-float</a> <a href='405screen.mu.html#L9'>screen</a>, half
<span id="L23" class="LineNr"> 23 </span> <span class="muComment">#</span>
<span id="L24" class="LineNr"> 24 </span> <a href='405screen.mu.html#L657'>check-screen-row</a> <a href='405screen.mu.html#L9'>screen</a>, <span class="Constant">1</span>, <span class="Constant">"1.000000P-01 "</span>, <span class="Constant">"F - test-print-float-normal"</span>
<span id="L25" class="LineNr"> 25 </span><span class="Delimiter">}</span>
<span id="L26" class="LineNr"> 26 </span>
<span id="L27" class="LineNr"> 27 </span><span class="PreProc">fn</span> <span class="muTest"><a href='408print-float.mu.html#L27'>test-print-float-zero</a></span> <span class="Delimiter">{</span>
<span id="L28" class="LineNr"> 28 </span> <span class="PreProc">var</span> screen-on-stack: <a href='405screen.mu.html#L9'>screen</a>
<span id="L29" class="LineNr"> 29 </span> <span class="PreProc">var</span> <a href='405screen.mu.html#L9'>screen</a>/<span class="Constant">esi</span>: (addr <a href='405screen.mu.html#L9'>screen</a>) <span class="SpecialChar"><-</span> address screen-on-stack
<span id="L30" class="LineNr"> 30 </span> <a href='405screen.mu.html#L30'>initialize-screen</a> <a href='405screen.mu.html#L9'>screen</a>, <span class="Constant">5</span>, <span class="Constant">0x20</span> <span class="muComment"># 32 columns should be more than enough</span>
<span id="L31" class="LineNr"> 31 </span> <span class="muComment"># print 0</span>
<span id="L32" class="LineNr"> 32 </span> <span class="PreProc">var</span> zero: float
<span id="L33" class="LineNr"> 33 </span> <a href='408print-float.mu.html#L92'>print-float</a> <a href='405screen.mu.html#L9'>screen</a>, zero
<span id="L34" class="LineNr"> 34 </span> <span class="muComment">#</span>
<span id="L35" class="LineNr"> 35 </span> <a href='405screen.mu.html#L657'>check-screen-row</a> <a href='405screen.mu.html#L9'>screen</a>, <span class="Constant">1</span>, <span class="Constant">"0 "</span>, <span class="Constant">"F - test-print-float-zero"</span>
<span id="L36" class="LineNr"> 36 </span><span class="Delimiter">}</span>
<span id="L37" class="LineNr"> 37 </span>
<span id="L38" class="LineNr"> 38 </span><span class="PreProc">fn</span> <span class="muTest"><a href='408print-float.mu.html#L38'>test-print-float-negative-zero</a></span> <span class="Delimiter">{</span>
<span id="L39" class="LineNr"> 39 </span> <span class="PreProc">var</span> screen-on-stack: <a href='405screen.mu.html#L9'>screen</a>
<span id="L40" class="LineNr"> 40 </span> <span class="PreProc">var</span> <a href='405screen.mu.html#L9'>screen</a>/<span class="Constant">esi</span>: (addr <a href='405screen.mu.html#L9'>screen</a>) <span class="SpecialChar"><-</span> address screen-on-stack
<span id="L41" class="LineNr"> 41 </span> <a href='405screen.mu.html#L30'>initialize-screen</a> <a href='405screen.mu.html#L9'>screen</a>, <span class="Constant">5</span>, <span class="Constant">0x20</span> <span class="muComment"># 32 columns should be more than enough</span>
<span id="L42" class="LineNr"> 42 </span> <span class="muComment"># print 0</span>
<span id="L43" class="LineNr"> 43 </span> <span class="PreProc">var</span> n: int
<span id="L44" class="LineNr"> 44 </span> copy-to n, <span class="Constant">0x80000000</span>
<span id="L45" class="LineNr"> 45 </span> <span class="PreProc">var</span> negative-zero/<span class="Constant">xmm0</span>: float <span class="SpecialChar"><-</span> reinterpret n
<span id="L46" class="LineNr"> 46 </span> <a href='408print-float.mu.html#L92'>print-float</a> <a href='405screen.mu.html#L9'>screen</a>, negative-zero
<span id="L47" class="LineNr"> 47 </span> <span class="muComment">#</span>
<span id="L48" class="LineNr"> 48 </span> <a href='405screen.mu.html#L657'>check-screen-row</a> <a href='405screen.mu.html#L9'>screen</a>, <span class="Constant">1</span>, <span class="Constant">"-0 "</span>, <span class="Constant">"F - test-print-float-negative-zero"</span>
<span id="L49" class="LineNr"> 49 </span><span class="Delimiter">}</span>
<span id="L50" class="LineNr"> 50 </span>
<span id="L51" class="LineNr"> 51 </span><span class="PreProc">fn</span> <span class="muTest"><a href='408print-float.mu.html#L51'>test-print-float-infinity</a></span> <span class="Delimiter">{</span>
<span id="L52" class="LineNr"> 52 </span> <span class="PreProc">var</span> screen-on-stack: <a href='405screen.mu.html#L9'>screen</a>
<span id="L53" class="LineNr"> 53 </span> <span class="PreProc">var</span> <a href='405screen.mu.html#L9'>screen</a>/<span class="Constant">esi</span>: (addr <a href='405screen.mu.html#L9'>screen</a>) <span class="SpecialChar"><-</span> address screen-on-stack
<span id="L54" class="LineNr"> 54 </span> <a href='405screen.mu.html#L30'>initialize-screen</a> <a href='405screen.mu.html#L9'>screen</a>, <span class="Constant">5</span>, <span class="Constant">0x20</span> <span class="muComment"># 32 columns should be more than enough</span>
<span id="L55" class="LineNr"> 55 </span> <span class="muComment"># print</span>
<span id="L56" class="LineNr"> 56 </span> <span class="PreProc">var</span> n: int
<span id="L57" class="LineNr"> 57 </span> <span class="muComment"># 0|11111111|00000000000000000000000</span>
<span id="L58" class="LineNr"> 58 </span> <span class="muComment"># 0111|1111|1000|0000|0000|0000|0000|0000</span>
<span id="L59" class="LineNr"> 59 </span> copy-to n, <span class="Constant">0x7f800000</span>
<span id="L60" class="LineNr"> 60 </span> <span class="PreProc">var</span> infinity/<span class="Constant">xmm0</span>: float <span class="SpecialChar"><-</span> reinterpret n
<span id="L61" class="LineNr"> 61 </span> <a href='408print-float.mu.html#L92'>print-float</a> <a href='405screen.mu.html#L9'>screen</a>, infinity
<span id="L62" class="LineNr"> 62 </span> <span class="muComment">#</span>
<span id="L63" class="LineNr"> 63 </span> <a href='405screen.mu.html#L657'>check-screen-row</a> <a href='405screen.mu.html#L9'>screen</a>, <span class="Constant">1</span>, <span class="Constant">"Inf "</span>, <span class="Constant">"F - test-print-float-infinity"</span>
<span id="L64" class="LineNr"> 64 </span><span class="Delimiter">}</span>
<span id="L65" class="LineNr"> 65 </span>
<span id="L66" class="LineNr"> 66 </span><span class="PreProc">fn</span> <span class="muTest"><a href='408print-float.mu.html#L66'>test-print-float-negative-infinity</a></span> <span class="Delimiter">{</span>
<span id="L67" class="LineNr"> 67 </span> <span class="PreProc">var</span> screen-on-stack: <a href='405screen.mu.html#L9'>screen</a>
<span id="L68" class="LineNr"> 68 </span> <span class="PreProc">var</span> <a href='405screen.mu.html#L9'>screen</a>/<span class="Constant">esi</span>: (addr <a href='405screen.mu.html#L9'>screen</a>) <span class="SpecialChar"><-</span> address screen-on-stack
<span id="L69" class="LineNr"> 69 </span> <a href='405screen.mu.html#L30'>initialize-screen</a> <a href='405screen.mu.html#L9'>screen</a>, <span class="Constant">5</span>, <span class="Constant">0x20</span> <span class="muComment"># 32 columns should be more than enough</span>
<span id="L70" class="LineNr"> 70 </span> <span class="muComment"># print</span>
<span id="L71" class="LineNr"> 71 </span> <span class="PreProc">var</span> n: int
<span id="L72" class="LineNr"> 72 </span> copy-to n, <span class="Constant">0xff800000</span>
<span id="L73" class="LineNr"> 73 </span> <span class="PreProc">var</span> negative-infinity/<span class="Constant">xmm0</span>: float <span class="SpecialChar"><-</span> reinterpret n
<span id="L74" class="LineNr"> 74 </span> <a href='408print-float.mu.html#L92'>print-float</a> <a href='405screen.mu.html#L9'>screen</a>, negative-infinity
<span id="L75" class="LineNr"> 75 </span> <span class="muComment">#</span>
<span id="L76" class="LineNr"> 76 </span> <a href='405screen.mu.html#L657'>check-screen-row</a> <a href='405screen.mu.html#L9'>screen</a>, <span class="Constant">1</span>, <span class="Constant">"-Inf "</span>, <span class="Constant">"F - test-print-float-negative-infinity"</span>
<span id="L77" class="LineNr"> 77 </span><span class="Delimiter">}</span>
<span id="L78" class="LineNr"> 78 </span>
<span id="L79" class="LineNr"> 79 </span><span class="PreProc">fn</span> <span class="muTest"><a href='408print-float.mu.html#L79'>test-print-float-not-a-number</a></span> <span class="Delimiter">{</span>
<span id="L80" class="LineNr"> 80 </span> <span class="PreProc">var</span> screen-on-stack: <a href='405screen.mu.html#L9'>screen</a>
<span id="L81" class="LineNr"> 81 </span> <span class="PreProc">var</span> <a href='405screen.mu.html#L9'>screen</a>/<span class="Constant">esi</span>: (addr <a href='405screen.mu.html#L9'>screen</a>) <span class="SpecialChar"><-</span> address screen-on-stack
<span id="L82" class="LineNr"> 82 </span> <a href='405screen.mu.html#L30'>initialize-screen</a> <a href='405screen.mu.html#L9'>screen</a>, <span class="Constant">5</span>, <span class="Constant">0x20</span> <span class="muComment"># 32 columns should be more than enough</span>
<span id="L83" class="LineNr"> 83 </span> <span class="muComment"># print</span>
<span id="L84" class="LineNr"> 84 </span> <span class="PreProc">var</span> n: int
<span id="L85" class="LineNr"> 85 </span> copy-to n, <span class="Constant">0xffffffff</span> <span class="muComment"># exponent must be all 1's, and mantissa must be non-zero</span>
<span id="L86" class="LineNr"> 86 </span> <span class="PreProc">var</span> negative-infinity/<span class="Constant">xmm0</span>: float <span class="SpecialChar"><-</span> reinterpret n
<span id="L87" class="LineNr"> 87 </span> <a href='408print-float.mu.html#L92'>print-float</a> <a href='405screen.mu.html#L9'>screen</a>, negative-infinity
<span id="L88" class="LineNr"> 88 </span> <span class="muComment">#</span>
<span id="L89" class="LineNr"> 89 </span> <a href='405screen.mu.html#L657'>check-screen-row</a> <a href='405screen.mu.html#L9'>screen</a>, <span class="Constant">1</span>, <span class="Constant">"Nan "</span>, <span class="Constant">"F - test-print-float-not-a-number"</span>
<span id="L90" class="LineNr"> 90 </span><span class="Delimiter">}</span>
<span id="L91" class="LineNr"> 91 </span>
<span id="L92" class="LineNr"> 92 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='408print-float.mu.html#L92'>print-float</a></span> <a href='405screen.mu.html#L9'>screen</a>: (addr <a href='405screen.mu.html#L9'>screen</a>), n: float <span class="Delimiter">{</span>
<span id="L93" class="LineNr"> 93 </span>$print-float:body: <span class="Delimiter">{</span>
<span id="L94" class="LineNr"> 94 </span> # - special names
<span id="L95" class="LineNr"> 95 </span> <span class="PreProc">var</span> bits/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> reinterpret n
<span id="L96" class="LineNr"> 96 </span> compare bits, <span class="Constant">0</span>
<span id="L97" class="LineNr"> 97 </span> <span class="Delimiter">{</span>
<span id="L98" class="LineNr"> 98 </span> <span class="PreProc">break-if-!=</span>
<span id="L99" class="LineNr"> 99 </span> <a href='405screen.mu.html#L179'>print-string</a> <a href='405screen.mu.html#L9'>screen</a>, <span class="Constant">"0"</span>
<span id="L100" class="LineNr">100 </span> <span class="PreProc">break</span> $print-float:body
<span id="L101" class="LineNr">101 </span> <span class="Delimiter">}</span>
<span id="L102" class="LineNr">102 </span> compare bits, <span class="Constant">0x80000000</span>
<span id="L103" class="LineNr">103 </span> <span class="Delimiter">{</span>
<span id="L104" class="LineNr">104 </span> <span class="PreProc">break-if-!=</span>
<span id="L105" class="LineNr">105 </span> <a href='405screen.mu.html#L179'>print-string</a> <a href='405screen.mu.html#L9'>screen</a>, <span class="Constant">"-0"</span>
<span id="L106" class="LineNr">106 </span> <span class="PreProc">break</span> $print-float:body
<span id="L107" class="LineNr">107 </span> <span class="Delimiter">}</span>
<span id="L108" class="LineNr">108 </span> compare bits, <span class="Constant">0x7f800000</span>
<span id="L109" class="LineNr">109 </span> <span class="Delimiter">{</span>
<span id="L110" class="LineNr">110 </span> <span class="PreProc">break-if-!=</span>
<span id="L111" class="LineNr">111 </span> <a href='405screen.mu.html#L179'>print-string</a> <a href='405screen.mu.html#L9'>screen</a>, <span class="Constant">"Inf"</span>
<span id="L112" class="LineNr">112 </span> <span class="PreProc">break</span> $print-float:body
<span id="L113" class="LineNr">113 </span> <span class="Delimiter">}</span>
<span id="L114" class="LineNr">114 </span> compare bits, <span class="Constant">0xff800000</span>
<span id="L115" class="LineNr">115 </span> <span class="Delimiter">{</span>
<span id="L116" class="LineNr">116 </span> <span class="PreProc">break-if-!=</span>
<span id="L117" class="LineNr">117 </span> <a href='405screen.mu.html#L179'>print-string</a> <a href='405screen.mu.html#L9'>screen</a>, <span class="Constant">"-Inf"</span>
<span id="L118" class="LineNr">118 </span> <span class="PreProc">break</span> $print-float:body
<span id="L119" class="LineNr">119 </span> <span class="Delimiter">}</span>
<span id="L120" class="LineNr">120 </span> <span class="PreProc">var</span> exponent/<span class="Constant">ecx</span>: int <span class="SpecialChar"><-</span> copy bits
<span id="L121" class="LineNr">121 </span> exponent <span class="SpecialChar"><-</span> shift-right <span class="Constant">0x17</span> <span class="muComment"># 23 bits of mantissa</span>
<span id="L122" class="LineNr">122 </span> exponent <span class="SpecialChar"><-</span> and <span class="Constant">0xff</span>
<span id="L123" class="LineNr">123 </span> compare exponent, <span class="Constant">0xff</span>
<span id="L124" class="LineNr">124 </span> <span class="Delimiter">{</span>
<span id="L125" class="LineNr">125 </span> <span class="PreProc">break-if-!=</span>
<span id="L126" class="LineNr">126 </span> <a href='405screen.mu.html#L179'>print-string</a> <a href='405screen.mu.html#L9'>screen</a>, <span class="Constant">"Nan"</span>
<span id="L127" class="LineNr">127 </span> <span class="PreProc">break</span> $print-float:body
<span id="L128" class="LineNr">128 </span> <span class="Delimiter">}</span>
<span id="L129" class="LineNr">129 </span> # - regular numbers
<span id="L130" class="LineNr">130 </span> <span class="PreProc">var</span> sign/<span class="Constant">edx</span>: int <span class="SpecialChar"><-</span> copy bits
<span id="L131" class="LineNr">131 </span> sign <span class="SpecialChar"><-</span> shift-right <span class="Constant">0x1f</span>
<span id="L132" class="LineNr">132 </span> <span class="Delimiter">{</span>
<span id="L133" class="LineNr">133 </span> compare sign, <span class="Constant">1</span>
<span id="L134" class="LineNr">134 </span> <span class="PreProc">break-if-!=</span>
<span id="L135" class="LineNr">135 </span> <a href='405screen.mu.html#L179'>print-string</a> <a href='405screen.mu.html#L9'>screen</a>, <span class="Constant">"-"</span>
<span id="L136" class="LineNr">136 </span> <span class="Delimiter">}</span>
<span id="L137" class="LineNr">137 </span> $print-float:leading-digit: <span class="Delimiter">{</span>
<span id="L138" class="LineNr">138 </span> <span class="muComment"># check for subnormal numbers</span>
<span id="L139" class="LineNr">139 </span> compare exponent, <span class="Constant">0</span>
<span id="L140" class="LineNr">140 </span> <span class="Delimiter">{</span>
<span id="L141" class="LineNr">141 </span> <span class="PreProc">break-if-!=</span>
<span id="L142" class="LineNr">142 </span> <a href='405screen.mu.html#L179'>print-string</a> <a href='405screen.mu.html#L9'>screen</a>, <span class="Constant">"0."</span>
<span id="L143" class="LineNr">143 </span> exponent <span class="SpecialChar"><-</span> increment
<span id="L144" class="LineNr">144 </span> <span class="PreProc">break</span> $print-float:leading-digit
<span id="L145" class="LineNr">145 </span> <span class="Delimiter">}</span>
<span id="L146" class="LineNr">146 </span> <span class="muComment"># normal numbers</span>
<span id="L147" class="LineNr">147 </span> <a href='405screen.mu.html#L179'>print-string</a> <a href='405screen.mu.html#L9'>screen</a>, <span class="Constant">"1."</span>
<span id="L148" class="LineNr">148 </span> <span class="Delimiter">}</span>
<span id="L149" class="LineNr">149 </span> <span class="PreProc">var</span> mantissa/<span class="Constant">ebx</span>: int <span class="SpecialChar"><-</span> copy bits
<span id="L150" class="LineNr">150 </span> mantissa <span class="SpecialChar"><-</span> and <span class="Constant">0x7fffff</span>
<span id="L151" class="LineNr">151 </span> <a href='405screen.mu.html#L454'>print-int32-hex-bits</a> <a href='405screen.mu.html#L9'>screen</a>, mantissa, <span class="Constant">0x18</span>
<span id="L152" class="LineNr">152 </span> <span class="muComment"># print exponent</span>
<span id="L153" class="LineNr">153 </span> <a href='405screen.mu.html#L179'>print-string</a> <a href='405screen.mu.html#L9'>screen</a>, <span class="Constant">"P"</span>
<span id="L154" class="LineNr">154 </span> exponent <span class="SpecialChar"><-</span> subtract <span class="Constant">0x7f</span>
<span id="L155" class="LineNr">155 </span> compare exponent, <span class="Constant">0</span>
<span id="L156" class="LineNr">156 </span> <span class="Delimiter">{</span>
<span id="L157" class="LineNr">157 </span> <span class="PreProc">break-if->=</span>
<span id="L158" class="LineNr">158 </span> <a href='405screen.mu.html#L179'>print-string</a> <a href='405screen.mu.html#L9'>screen</a>, <span class="Constant">"-"</span>
<span id="L159" class="LineNr">159 </span> <span class="Delimiter">}</span>
<span id="L160" class="LineNr">160 </span> <span class="PreProc">var</span> exp-magnitude/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> <a href='406try-divide.mu.html#L100'>abs</a> exponent
<span id="L161" class="LineNr">161 </span> <a href='405screen.mu.html#L454'>print-int32-hex-bits</a> <a href='405screen.mu.html#L9'>screen</a>, exp-magnitude, <span class="Constant">8</span>
<span id="L162" class="LineNr">162 </span><span class="Delimiter">}</span>
<span id="L163" class="LineNr">163 </span><span class="Delimiter">}</span>
<span id="L164" class="LineNr">164 </span>
<span id="L165" class="LineNr">165 </span><span class="CommentedCode">#? fn main -> r/ebx: int {</span>
<span id="L166" class="LineNr">166 </span><span class="CommentedCode">#? run-tests</span>
<span id="L167" class="LineNr">167 </span><span class="CommentedCode">#? #? test-print-float-negative-zero</span>
<span id="L168" class="LineNr">168 </span><span class="CommentedCode">#? #? print-int32-hex 0, 0</span>
<span id="L169" class="LineNr">169 </span><span class="CommentedCode">#? #? test-print-float-normal</span>
<span id="L170" class="LineNr">170 </span><span class="CommentedCode">#? r <- copy 0</span>
<span id="L171" class="LineNr">171 </span><span class="CommentedCode">#? }</span>
</pre>
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