[PATCH] D40524: Handle the case of live 16-bit subregisters in X86FixupBWInsts

[Andrei Elovikov via Phabricator via llvm-commits]

a.elovikov added inline comments.


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Comment at: test/CodeGen/X86/fixup-bw-inst.mir:195
+
+    %r9b = MOV8rr undef %r10b, implicit-def %eflags
+    ; CHECK-NOT: MOV32rr
----------------
I'm surprised not to see "%R9D<imp-use,kill>, %R9D<imp-def>" from the Bugzilla here. IIIC the use below does not prevent anything because it might be use-undef so I'm not sure what exactly in this test prevents the transformation.


https://reviews.llvm.org/D40524