OpenCores
Issue List
l.mtspr incorrectly implemented in Or1ksim #100
Closed jeremybennett opened this issue almost 14 years ago
jeremybennett commented almost 14 years ago
<p> The implementation of <tt>l.mtspr</tt> in Or1ksim is incorrect. The immediate values should be ORed with the contents of rA, not added to it. </p> <p> In practice this causes little difficulty, since invariably r0 is used for rA and addition and ORing then yield the same result. <p> Reported in <em>Implementation and Verification of a CPU Subsystem for Multimode RF Transceivers</em> by Waqas Ahmed of the Royal Institute of Technology, Sweden. </p> <p> Jeremy </p> <p> -- <br /> Tel: +44 (1590) 610184<br /> Cell: +44 (7970) 676050<br /> SkypeID: jeremybennett<br /> Email: <a href="mailto:jeremy.bennett@embecosm.com">jeremy.bennett@embecosm.com</a><br /> Web: <a href="http://www.embecosm.com">www.embecosm.com</a> </p>
jeremybennett was assigned almost 14 years ago
jeremybennett commented almost 14 years ago
<p> The same problem also applies to <tt>l.mfspr</tt>. </p> <p> Jeremy </p>
jeremybennett commented almost 14 years ago
<p> Corrected in top of tree. Regression tests added. </p> <p> Marking closed. </p> <p> Jeremy </p>
jeremybennett closed this almost 14 years ago

Assignee
jeremybennett
Labels
Bug