On the current tip of binutils-2_26-branch, gas is emitting an incorrect
warning 'Warning: index and destination registers should be distinct' when the
two zmm registers are separated by 16. For exmaple, zmm19 and zmm3 in
'vgatherqpd (%rax,%zmm19,8), %zmm3 {%k1}'. This warning was added in
commit 8444f82a1d163171deccfcf014cc31adb81f703b. The problem appears to be
that the register_number() function in gas/config/tc-i386.c doesn't check for
RegVRex flag like it does for the RegRex flag, leading to aliasing issues
between the low and high 16 registers.
Steven Vormwald
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