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Summary: This patch allows NVPTXFavorNonGenericAddrSpaces to remove addrspacecast from longer chains consisting of GEPs and BitCasts. For example, it can now optimize %0 = addrspacecast [10 x float] addrspace(3)* @a to [10 x float]* %1 = gep [10 x float]* %0, i64 0, i64 %i %2 = bitcast float* %1 to i32* %3 = load i32* %2 ; emits ld.u32 to %0 = gep [10 x float] addrspace(3)* @a, i64 0, i64 %i %1 = bitcast float addrspace(3)* %0 to i32 addrspace(3)* %3 = load i32 addrspace(3)* %1 ; emits ld.shared.f32 Test Plan: @ld_int_from_global_float in access-non-generic.ll Reviewers: broune, eliben, jholewinski, meheff Subscribers: jholewinski, llvm-commits Differential Revision: http://reviews.llvm.org/D10074 llvm-svn: 238574
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