https://gunkies.org/w/index.php?title=Reduced_Instruction_Set_Computer&feed=atom&action=historyReduced Instruction Set Computer - Revision history2024-03-28T10:57:49ZRevision history for this page on the wikiMediaWiki 1.30.0https://gunkies.org/w/index.php?title=Reduced_Instruction_Set_Computer&diff=19642&oldid=prevJnc: +cat2018-12-16T00:01:48Z<p>+cat</p>
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<td colspan="2" style="background-color: white; color:black; text-align: center;">Revision as of 00:01, 16 December 2018</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>*[[Complex Instruction Set Computer]]</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>* [[Complex Instruction Set Computer<ins class="diffchange diffchange-inline">]]</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> </div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins class="diffchange diffchange-inline">[[Category: Computer Basics</ins>]]</div></td></tr>
</table>Jnchttps://gunkies.org/w/index.php?title=Reduced_Instruction_Set_Computer&diff=14084&oldid=prevJnc: rm dup linkage2017-08-19T14:00:17Z<p>rm dup linkage</p>
<table class="diff diff-contentalign-left" data-mw="interface">
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<td colspan="2" style="background-color: white; color:black; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: white; color:black; text-align: center;">Revision as of 14:00, 19 August 2017</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l1" >Line 1:</td>
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<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>A '''Reduced Instruction Set Computer''' (usually abbreviated to '''RISC''') is one from a school of [[Central Processing Unit|CPU]] [[architecture]] in which the goal is to produce a design whose [[object code]] is optimized toward producing the fastest possible [[instruction]] [[execution time]], as part of a overall <del class="diffchange diffchange-inline">[[</del>system architecture<del class="diffchange diffchange-inline">]] </del>which maximizes the performance at minimum cost.</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>A '''Reduced Instruction Set Computer''' (usually abbreviated to '''RISC''') is one from a school of [[Central Processing Unit|CPU]] [[architecture]] in which the goal is to produce a design whose [[object code]] is optimized toward producing the fastest possible [[instruction]] [[execution time]], as part of a overall system architecture which maximizes the performance at minimum cost.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>The original RISC machine, the [[IBM 801]], was designed together with its compiler, the concept being that functionality would be divided between the two in such a way as to achieve the cost/performance goals, with the compiler doing things to make the hardware as simple (and thus fast) as possible. While the compiler would be more complex, as it had to include extra mechanism to do things that the hardware did not do, the engineering costs of that would be amortized over all the units, whereas extra hardware is a cost in every unit.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>The original RISC machine, the [[IBM 801]], was designed together with its compiler, the concept being that functionality would be divided between the two in such a way as to achieve the cost/performance goals, with the compiler doing things to make the hardware as simple (and thus fast) as possible. While the compiler would be more complex, as it had to include extra mechanism to do things that the hardware did not do, the engineering costs of that would be amortized over all the units, whereas extra hardware is a cost in every unit.</div></td></tr>
</table>Jnchttps://gunkies.org/w/index.php?title=Reduced_Instruction_Set_Computer&diff=14075&oldid=prevJnc: copyedit a tiny bit2017-08-19T11:49:36Z<p>copyedit a tiny bit</p>
<table class="diff diff-contentalign-left" data-mw="interface">
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<td colspan="2" style="background-color: white; color:black; text-align: center;">Revision as of 11:49, 19 August 2017</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l1" >Line 1:</td>
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<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>'''Reduced Instruction Set Computer''' (usually abbreviated to '''RISC''') is a school of [[Central Processing Unit|CPU]] architecture in which the goal is to produce a design whose [[object code]] is optimized toward producing the fastest possible [[instruction]] [[execution time]], as part of a overall [[system architecture]] which maximizes the performance at minimum cost.</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins class="diffchange diffchange-inline">A </ins>'''Reduced Instruction Set Computer''' (usually abbreviated to '''RISC''') is <ins class="diffchange diffchange-inline">one from </ins>a school of [[Central Processing Unit|CPU]] <ins class="diffchange diffchange-inline">[[</ins>architecture<ins class="diffchange diffchange-inline">]] </ins>in which the goal is to produce a design whose [[object code]] is optimized toward producing the fastest possible [[instruction]] [[execution time]], as part of a overall [[system architecture]] which maximizes the performance at minimum cost.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>The original RISC machine, the [[IBM 801]], was designed together with its compiler, the concept being that functionality would be divided between the two in such a way as to achieve the cost/performance goals, with the compiler doing things to make the hardware as simple (and thus fast) as possible. While the compiler would be more complex, as it had to include extra mechanism to do things that the hardware did not do, the engineering costs of that would be amortized over all the units, whereas extra hardware is a cost in every unit.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>The original RISC machine, the [[IBM 801]], was designed together with its compiler, the concept being that functionality would be divided between the two in such a way as to achieve the cost/performance goals, with the compiler doing things to make the hardware as simple (and thus fast) as possible. While the compiler would be more complex, as it had to include extra mechanism to do things that the hardware did not do, the engineering costs of that would be amortized over all the units, whereas extra hardware is a cost in every unit.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>To achieve this goal, the instructions are made as simple as possible; the machines <del class="diffchange diffchange-inline">were </del>generally [[load-store architecture]]s, and most instructions only <del class="diffchange diffchange-inline">performed </del>a single reference to [[main memory]].</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>To achieve this goal, the instructions are made as simple as possible; the machines <ins class="diffchange diffchange-inline">are </ins>generally [[load-store architecture]]s, and most instructions only <ins class="diffchange diffchange-inline">perform </ins>a single reference to [[main memory]] <ins class="diffchange diffchange-inline">(other than their own fetch)</ins>.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>One engineering technique used internally is to look for the longest signal path through the CPU, and try and get rid of the instruction/feature which uses it - this will allow the machine's cycle time to be reduced, i.e. increasing its clock speed.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>One engineering technique used internally is to look for the longest signal path through the CPU, and try and get rid of the instruction/feature which uses it - this will allow the machine's cycle time to be reduced, i.e. increasing its clock speed.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Another way of looking at RISC is that it does not try and maximize the ''instruction density'' - i.e. the number of memory bits needed to hold a given set of programming functionality. This means that it did not maximize the efficiency of the main memory's bandwidth <del class="diffchange diffchange-inline">- </del>the latter having been the principle bottleneck in older computers (particularly those using [[core memory]].</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Another way of looking at RISC is that it does not try and maximize the ''instruction density'' - i.e. the number of memory bits needed to hold a given set of programming functionality. This means that it did not maximize the efficiency of the main memory's bandwidth <ins class="diffchange diffchange-inline">(and space, although </ins>the latter <ins class="diffchange diffchange-inline">is no longer as important a goal as it used to be, with the advent of extemely large main memories typical on modern machines), that </ins>having been the principle bottleneck in older computers (particularly those using [[core memory]]<ins class="diffchange diffchange-inline">)</ins>.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>==See also==</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>==See also==</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>*[[Complex Instruction Set Computer]]</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>*[[Complex Instruction Set Computer]]</div></td></tr>
</table>Jnchttps://gunkies.org/w/index.php?title=Reduced_Instruction_Set_Computer&diff=14066&oldid=prevJnc: + See also - CISC2017-08-18T23:32:36Z<p>+ See also - CISC</p>
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<td colspan="2" style="background-color: white; color:black; text-align: center;">Revision as of 23:32, 18 August 2017</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l8" >Line 8:</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Another way of looking at RISC is that it does not try and maximize the ''instruction density'' - i.e. the number of memory bits needed to hold a given set of programming functionality. This means that it did not maximize the efficiency of the main memory's bandwidth - the latter having been the principle bottleneck in older computers (particularly those using [[core memory]].</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Another way of looking at RISC is that it does not try and maximize the ''instruction density'' - i.e. the number of memory bits needed to hold a given set of programming functionality. This means that it did not maximize the efficiency of the main memory's bandwidth - the latter having been the principle bottleneck in older computers (particularly those using [[core memory]].</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">==See also==</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">*[[Complex Instruction Set Computer]]</ins></div></td></tr>
</table>Jnchttps://gunkies.org/w/index.php?title=Reduced_Instruction_Set_Computer&diff=14065&oldid=prevJnc: Add technique of removing the longest signal path2017-08-18T23:30:24Z<p>Add technique of removing the longest signal path</p>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>To achieve this goal, the instructions are made as simple as possible; the machines were generally [[load-store architecture]]s, and most instructions only performed a single reference to [[main memory]].</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>To achieve this goal, the instructions are made as simple as possible; the machines were generally [[load-store architecture]]s, and most instructions only performed a single reference to [[main memory]].</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">One engineering technique used internally is to look for the longest signal path through the CPU, and try and get rid of the instruction/feature which uses it - this will allow the machine's cycle time to be reduced, i.e. increasing its clock speed.</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Another way of looking at RISC is that it does not try and maximize the ''instruction density'' - i.e. the number of memory bits needed to hold a given set of programming functionality. This means that it did not maximize the efficiency of the main memory's bandwidth - the latter having been the principle bottleneck in older computers (particularly those using [[core memory]].</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Another way of looking at RISC is that it does not try and maximize the ''instruction density'' - i.e. the number of memory bits needed to hold a given set of programming functionality. This means that it did not maximize the efficiency of the main memory's bandwidth - the latter having been the principle bottleneck in older computers (particularly those using [[core memory]].</div></td></tr>
</table>Jnchttps://gunkies.org/w/index.php?title=Reduced_Instruction_Set_Computer&diff=14058&oldid=prevJnc: Jnc moved page RISC to Reduced Instruction Set Computer: Put article at full name2017-08-18T21:46:12Z<p>Jnc moved page <a href="/wiki/RISC" class="mw-redirect" title="RISC">RISC</a> to <a href="/wiki/Reduced_Instruction_Set_Computer" title="Reduced Instruction Set Computer">Reduced Instruction Set Computer</a>: Put article at full name</p>
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<td colspan="1" style="background-color: white; color:black; text-align: center;">← Older revision</td>
<td colspan="1" style="background-color: white; color:black; text-align: center;">Revision as of 21:46, 18 August 2017</td>
</tr><tr><td colspan="2" style="text-align: center;" lang="en"><div class="mw-diff-empty">(No difference)</div>
</td></tr></table>Jnchttps://gunkies.org/w/index.php?title=Reduced_Instruction_Set_Computer&diff=14057&oldid=prevJnc: A good start2017-08-18T21:41:19Z<p>A good start</p>
<p><b>New page</b></p><div>'''Reduced Instruction Set Computer''' (usually abbreviated to '''RISC''') is a school of [[Central Processing Unit|CPU]] architecture in which the goal is to produce a design whose [[object code]] is optimized toward producing the fastest possible [[instruction]] [[execution time]], as part of a overall [[system architecture]] which maximizes the performance at minimum cost.<br />
<br />
The original RISC machine, the [[IBM 801]], was designed together with its compiler, the concept being that functionality would be divided between the two in such a way as to achieve the cost/performance goals, with the compiler doing things to make the hardware as simple (and thus fast) as possible. While the compiler would be more complex, as it had to include extra mechanism to do things that the hardware did not do, the engineering costs of that would be amortized over all the units, whereas extra hardware is a cost in every unit.<br />
<br />
To achieve this goal, the instructions are made as simple as possible; the machines were generally [[load-store architecture]]s, and most instructions only performed a single reference to [[main memory]].<br />
<br />
Another way of looking at RISC is that it does not try and maximize the ''instruction density'' - i.e. the number of memory bits needed to hold a given set of programming functionality. This means that it did not maximize the efficiency of the main memory's bandwidth - the latter having been the principle bottleneck in older computers (particularly those using [[core memory]].</div>Jnc