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-rw-r--r--src/shared/evex.in2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/shared/evex.in b/src/shared/evex.in
index efeec20..837b867 100644
--- a/src/shared/evex.in
+++ b/src/shared/evex.in
@@ -2842,6 +2842,8 @@ pub(crate) fn read_evex_operands<
if mem_oper == OperandSpec::RegMMM {
instruction.mem_size = 0;
instruction.regs[1].bank = RegisterBank::K;
+ // only 8 mask registers, `xed` suggests that any invalid bits are masked out???
+ instruction.regs[1].num &= 0b111;
} else {
return Err(DecodeError::InvalidOperand);
}