[PATCH] D118545: [ARM] Fix 8-bit immediate overflow in the instruction of segmented stack prologue.

[Eli Friedman via Phabricator via llvm-commits]

efriedma added a comment.

When we don't have movw/movt, there is no two-instruction sequence to materialize an arbitrary immediate, so we only use ARM::MOVi32imm in very limited cases.  See https://github.com/llvm/llvm-project/blob/807e2f12fab52c6abf3e89c02eec0f585b3b8f22/llvm/lib/Target/ARM/ARMInstrInfo.td#L836 and https://github.com/llvm/llvm-project/blob/807e2f12fab52c6abf3e89c02eec0f585b3b8f22/llvm/lib/Target/ARM/ARMExpandPseudoInsts.cpp#L970 .  (Maybe ARMExpandPseudo::ExpandMOV32BitImm should have an assertion to make this clear.)


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