[PATCH] D99195: [RISCV] Optimize BUILD_VECTOR sequences that reveal hidden splats

[Fraser Cormack via Phabricator via llvm-commits]

frasercrmck marked an inline comment as done.
frasercrmck added inline comments.


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Comment at: llvm/lib/Target/RISCV/RISCVISelLowering.cpp:1274
+    }
+
+    // Since we can't introduce illegal i64 types at this stage, we can only
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craig.topper wrote:
> Do we need to sign extend SplatValue if the ViaIntVT is 32 and XLen is 64 bit to guarantee optimal constant materialization?
Ah yes of course. Thanks! Done, with a test to show its benefit.


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https://reviews.llvm.org/D99195