It is caused by
commit 21df382b918888de64749e977f185c4e10a5b838
Author: Jan Beulich <[email protected]>
Date: Tue Jul 16 09:30:29 2019 +0200
x86: fold SReg{2,3}
They're the only exception to there generally being no mix of register
kinds possible in an insn operand template, and there being two bits per
operand for their representation is also quite wasteful, considering the
low number of uses. Fold both bits and deal with the little bit of
fallout.
Also take the liberty and drop dead code trying to set REX_B: No segment
register has RegRex set on it.
Additionally I was quite surprised that PUSH/POP with the permitted
segment registers is not covered by the test cases. Add the missing
pieces.
Assembler disallows "popq %fs", but disassembler still display "popq
%fs".
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https://bugs.launchpad.net/bugs/1843394
Title:
FTBFS in Eoan - Error: operand type mismatch for `push' - gcc 9.2.1 /
binutils 2.32.51.20190905-0ubuntu1
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