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[X86] Add a FIXME about why the CWD/CDQ/CQO have a bogus implicit def of the A…

Authored by craig.topper on Thu, Sep 5, 10:24 AM.

Description

[X86] Add a FIXME about why the CWD/CDQ/CQO have a bogus implicit def of the A register. NFC

The instructions copy the sign bit of the A register to every bit
of the D register. But they don't write to the A register.

llvm-svn: 371094

Details

Committed
craig.topperThu, Sep 5, 10:24 AM
Parents
rG673da001c5e6: [X86] Remove unneeded CHECK lines from a test. NFC
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Event Timeline

xbolva00 added inline comments.
/llvm/lib/Target/X86/X86InstrExtension.td
25

Is this a known bug ? If not, please report it.