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[InstCombine] try to fold (select C, (sext A), B) into logical ops
Summary: Turn (select C, (sext A), B) into (sext (select C, A, B')) when A is i1 and B is a compatible constant, also for zext instead of sext. This will then be further folded into logical operations. The transformation would be valid for non-i1 types as well, but other parts of InstCombine prefer to have sext from non-i1 as an operand of select. Motivated by the shader compiler frontend in Mesa for AMDGPU, which emits i32 for boolean operations. With this change, the boolean logic is fully recovered. Reviewers: majnemer, spatel, tstellarAMD Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D22747 llvm-svn: 277801
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