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RISC-V: Add the Zihpm and Zicntr extensions

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These extensions were recently frozen [1].  As per Andrew's post [2]
we're meant to ignore these in software, this just adds them to the list
of allowed extensions and otherwise ignores them.  I added these under
SPEC_CLASS_NONE even though the PDF lists them as 20190614 because it
seems pointless to add another spec class just to accept two extensions
we then ignore.

1: https://groups.google.com/a/groups.riscv.org/g/isa-dev/c/HZGoqP1eyps/m/GTNKRLJoAQAJ
2: https://groups.google.com/a/groups.riscv.org/g/sw-dev/c/QKjQhChrq9Q/m/7gqdkctgAgAJ

gcc/ChangeLog

	* common/config/riscv/riscv-common.cc: Add Zihpm and Zicnttr
	extensions.
This commit is contained in:
Palmer Dabbelt 2022-11-08 19:00:36 -08:00 • committed by Kito Cheng
parent 5a22bb250d
commit 730a801f95
1 changed files with 3 additions and 0 deletions
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gcc/common/config/riscv/riscv-common.cc
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@ -279,6 +279,9 @@ static const struct riscv_ext_version riscv_ext_version_table[] =
{"zicbom",ISA_SPEC_CLASS_NONE, 1, 0},
{"zicbop",ISA_SPEC_CLASS_NONE, 1, 0},
{"zicntr", ISA_SPEC_CLASS_NONE, 2, 0},
{"zihpm", ISA_SPEC_CLASS_NONE, 2, 0},
{"zk", ISA_SPEC_CLASS_NONE, 1, 0},
{"zkn", ISA_SPEC_CLASS_NONE, 1, 0},
{"zks", ISA_SPEC_CLASS_NONE, 1, 0},