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Since WebAssembly's vector shift instructions take a scalar shift amount rather than a vector shift amount, we have to check in ISel that the vector shift amount is a splat. Previously, we were checking explicitly for splat BUILD_VECTOR nodes, but this change uses the standard utilities for detecting splat values that can handle more complex splat patterns. Since the C++ ISel lowering is now more general than the ISel patterns, this change also simplifies shift lowering by using the C++ lowering for all SIMD shifts rather than mixing C++ and normal pattern-based lowering. This change improves ISel for shifts to the point that the simd-shift-unroll.ll regression test no longer tests the code path it was originally meant to test. The bug corresponding to that regression test is no longer reproducible with its original reported reproducer, so rather than try to fix the regression test, this change just removes it. Differential Revision: https://reviews.llvm.org/D83278 |
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