[PATCH] D158852: [SDAG] Add computeKnownBits support for ISD::SPLAT_VECTOR_PARTS

[Craig Topper via Phabricator via llvm-commits]

craig.topper accepted this revision.
craig.topper added a comment.
This revision is now accepted and ready to land.

LGTM



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Comment at: llvm/test/CodeGen/RISCV/rvv/vror-sdnode.ll:2063
-; CHECK-RV32-NEXT:    vsetvli a0, zero, e64, m8, ta, ma
-; CHECK-RV32-NEXT:    vmv.v.i v16, 1
-; CHECK-RV32-NEXT:    vrsub.vi v16, v16, 0
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There's a missed constant fold of sub of two constant splat_vector parts here. computeKnownBits is hiding it because we constant fold it inside computeKnownBits, but we should handle it in FoldConstantArithmetic


Repository:
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  https://reviews.llvm.org/D158852/new/

https://reviews.llvm.org/D158852