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When selecting a G_CONSTANT to a MOVi, we need the value to be an Imm operand. We used to just leave the G_CONSTANT operand unchanged, which works in some cases (such as the GEP offsets that we create when referring to stack slots). However, in many other places the G_CONSTANTs are created with CImm operands. This patch makes sure to handle those as well, and to error out gracefully if in the end we don't end up with an Imm operand. Thanks to Oliver Stannard for reporting this issue. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@301162 91177308-0d34-0410-b5e6-96231b3b80d8
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