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authorGabe Black <gblack@eecs.umich.edu>2012-06-04 10:43:09 -0700
committerGabe Black <gblack@eecs.umich.edu>2012-06-04 10:43:09 -0700
commit35fa5074aa256880f70591eb656dceeb1a7feae0 (patch)
tree79704dcdb74aa43ee14c3cdb0d9aff19a41a570a /tests/long/se/10.mcf
parent7b73c36f5d52073025223dcdaca749758d274d52 (diff)
downloadgem5-35fa5074aa256880f70591eb656dceeb1a7feae0.tar.xz
X86: Ensure that the CPUID instruction always writes its outputs.
The CPUID instruction was implemented so that it would only write its results if the instruction was successful. This works fine on the simple CPU where unwritten registers retain their old values, but on a CPU like O3 with renaming this is broken. The instruction needs to write the old values back into the registers explicitly if they aren't being changed.
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