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authorGabe Black <gabeblack@google.com>2014-12-04 15:52:48 -0800
committerGabe Black <gabeblack@google.com>2014-12-04 15:52:48 -0800
commit3069c28a021d3f8c29221e537d48ee382c30646f (patch)
tree80129e305f4e152c129fa4c2176fe742f0cbd447 /src/arch/x86/decoder_tables.cc
parentcca1608bd52a1b8737dddc80a71cb1fa0bd57128 (diff)
downloadgem5-3069c28a021d3f8c29221e537d48ee382c30646f.tar.xz
arch: Allow named constants as decode case values.
The values in a "bitfield" or in an ExtMachInst structure member may not be a literal value, it might select from an arbitrary collection of options. Instead of using the raw value of those constants in the decoder, it's easier to tell what's going on if they can be referred to as a symbolic constant/enum. To support that, the ISA description language is extended slightly so that in addition to integer literals, the case value for decode blobs can also be a string literal. It's up to the ISA author to ensure that the string evaluates to a legal constant value when interpretted as C++.
Diffstat (limited to 'src/arch/x86/decoder_tables.cc')
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