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This patch is intended to solve: https://llvm.org/bugs/show_bug.cgi?id=28044 By changing the definition of X86ISD::CMPP to use float types, we allow it to be created and pass legalization for an SSE1-only target where v4i32 is not legal. The motivational trail for this change includes: https://llvm.org/bugs/show_bug.cgi?id=28001 and eventually makes this trigger: http://reviews.llvm.org/D21190 Ie, after this step, we should be free to have Clang generate FP compare IR instead of x86 intrinsics for SSE C packed compare intrinsics. (We can auto-upgrade and remove the LLVM sse.cmp intrinsics as a follow-up step.) Once we're generating vector IR instead of x86 intrinsics, a big pile of generic optimizations can trigger. Differential Revision: http://reviews.llvm.org/D21235 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@272511 91177308-0d34-0410-b5e6-96231b3b80d8