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-rw-r--r--riscv/processor.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/riscv/processor.cc b/riscv/processor.cc
index b62f98a..569b5fc 100644
--- a/riscv/processor.cc
+++ b/riscv/processor.cc
@@ -244,7 +244,7 @@ void processor_t::parse_isa_string(const char* str)
p++;
} else if (*p == 'x') {
const char* ext = p + 1, *end = ext;
- while (islower(*end) || *end == '_')
+ while (islower(*end))
end++;
auto ext_str = std::string(ext, end - ext);