Add latest snippy changes #4
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kv-sc
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Feb 13, 2024
asi-sc
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Jan 10, 2025
Somewhat confusingly a `SCEVMulExpr` is a `SCEVNAryExpr`, so can have > 2 operands. Previously, the vscale immediate matching did not check the number of operands of the `SCEVMulExpr`, so would ignore any operands after the first two. This led to incorrect codegen (and results) for ArmSME in IREE (https://github.com/iree-org/iree), which sometimes addresses things that are a `vscale * vscale` multiple away. The test added with this change shows an example reduced from IREE. The second write should be offset from the first `16 * vscale * vscale` (* 4 bytes), however, previously LSR dropped the second vscale and instead offset the write by `syntacore#4, mul vl`, which is an offset of `16 * vscale` (* 4 bytes). (cherry picked from commit 7fad04e94b7b594389111ae7eca0883ef18dc90b)
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