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authorGabe Black <gabeblack@google.com>2017-12-20 00:02:47 -0800
committerGabe Black <gabeblack@google.com>2017-12-23 03:36:45 +0000
commit87eb9a3a640875d176bec9dfb130450d23d8e8b8 (patch)
tree305da38c7ea611b9404dcf2d8a79e74cac8bef73 /src/arch/power
parentb7618c69a511e3fde5cdb674a91e5683f92e770f (diff)
downloadgem5-87eb9a3a640875d176bec9dfb130450d23d8e8b8.tar.xz
riscv,x86: Stop using the arch Nop machine instruction unnecessarily.
That particular ExtMachInst is a convenient placeholder, but a value of 0 in RISCV or a static uninitialized ExtMachInst (which will therefore be all zeroes) on x86 works just as well, and removes the need for an ISA specific constant. Also, the idea of a universal Nop doesn't always make sense since it could be that what, exactly, doesn't do anything depends on context which would be lost on a constant value of an ExtMachInst. For instance, the value of an ExtMachInst that makes sense might depend on what mode the CPU was in, etc. Change-Id: I1f1a43a5c607a667e11b79bcf6e059e4f7141b3f Reviewed-on: https://gem5-review.googlesource.com/6825 Reviewed-by: Gabe Black <gabeblack@google.com> Reviewed-by: Alec Roelke <ar4jc@virginia.edu> Maintainer: Gabe Black <gabeblack@google.com>
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