[all-commits] [llvm/llvm-project] 58c869: [AArch64] Generate usdot instruction with multiple...

[Sushant Gokhale via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 58c869682ac260cbd4e1818b08c4557fd6025aed
      https://github.com/llvm/llvm-project/commit/58c869682ac260cbd4e1818b08c4557fd6025aed
  Author: Sushant Gokhale <sgokhale at nvidia.com>
  Date:   2025-03-04 (Tue, 04 Mar 2025)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
    M llvm/test/CodeGen/AArch64/neon-partial-reduce-dot-product.ll

  Log Message:
  -----------
  [AArch64] Generate usdot instruction with multiple zext users in loop (#129718)

Currently, `partial_reduce(acc,mul(sext, zext))` is reduced to `usdot`
in loop only if `zext` has single user i.e. `mul`

If there are two partial reduce equations in loop body such as: 
```
partial_reduce1(acc1,mul1(sext1, zext))
partial_reduce2(acc2,mul2(sext2, zext))
```
and `zext` has no other users other than `mul1`/`mul2`, then this won't
result in `usdot` instructions.

This patch checks if multiple users of `zext`, like above, satisfy the
same set of conditions as for a single user so that `usdot` instructions
are generated.



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