[all-commits] [llvm/llvm-project] 396b6b: [RISCV] Recurse on second operand of two operand s...
Philip Reames via All-commits
all-commits at lists.llvm.org
Wed Jan 24 08:29:41 PST 2024
Branch: refs/heads/main
Home: https://github.com/llvm/llvm-project
Commit: 396b6bbc5ecef93fce09d6463f47b44dc501d2aa
https://github.com/llvm/llvm-project/commit/396b6bbc5ecef93fce09d6463f47b44dc501d2aa
Author: Philip Reames <preames at rivosinc.com>
Date: 2024-01-24 (Wed, 24 Jan 2024)
Changed paths:
M llvm/lib/Target/RISCV/RISCVISelLowering.cpp
M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-fp-interleave.ll
M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-int-interleave.ll
M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-int-shuffles.ll
M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-interleaved-access.ll
M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-shuffle-exact-vlen.ll
M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-shuffle-transpose.ll
M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-shufflevector-vnsrl.ll
M llvm/test/CodeGen/RISCV/rvv/vector-deinterleave-fixed.ll
Log Message:
-----------
[RISCV] Recurse on second operand of two operand shuffles (#79197)
This builds on bdc41106ee48dce59c500c9a3957af947f30c8c3.
This change completes the migration to a recursive shuffle lowering
strategy where when we encounter an unknown two argument shuffle, we
lower each operand as a single source permute, and then use a vselect
(i.e. a vmerge) to combine the results. This relies for code quality on
the post-isel combine which will aggressively fold that vmerge back into
the materialization of the second operand if possible.
Note: The change includes only the most immediately obvious of the
stylistic cleanup. There's a bunch of code movement that this enables
that I'll do as a separate patch as rolling it into this creates an
unreadable diff.
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