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tstellar opened this issue Dec 1, 2020 · 2 comments
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Driver/hip-toolchain-rdc-static-lib.hip fails on Windows #254

tstellar opened this issue Dec 1, 2020 · 2 comments

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tstellar commented Dec 1, 2020

https://llvm.org/PR48289
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tstellar commented Dec 1, 2020

cherry-pick: f89e9c8201ea5a5b63f854c92ed26bc7ab4b8db

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github-actions bot commented Dec 1, 2020

Cherry pick of f89e9c8201ea5a5b63f854c92ed26bc7ab4b8db failed

tstellar pushed a commit that referenced this issue Apr 9, 2024
@snikitav
[AArch64] SimplifyDemandedBitsForTargetNode - add AArch64ISD::BICi ha…
d38bff4 
…ndling (llvm#76644)

Fold BICi if all destination bits are already known to be zeroes

```llvm
define <8 x i16> @haddu_known(<8 x i8> %a0, <8 x i8> %a1) {
  %x0 = zext <8 x i8> %a0 to <8 x i16>
  %x1 = zext <8 x i8> %a1 to <8 x i16>
  %hadd = call <8 x i16> @llvm.aarch64.neon.uhadd.v8i16(<8 x i16> %x0, <8 x i16> %x1)
  %res = and <8 x i16> %hadd, <i16 511, i16 511, i16 511, i16 511,i16 511, i16 511, i16 511, i16 511>
  ret <8 x i16> %res
}
declare <8 x i16> @llvm.aarch64.neon.uhadd.v8i16(<8 x i16>, <8 x i16>)
```

```
haddu_known:                            // @haddu_known
        ushll   v0.8h, v0.8b, #0
        ushll   v1.8h, v1.8b, #0
        uhadd   v0.8h, v0.8h, v1.8h
        bic     v0.8h, #254, lsl #8 <-- this one will be removed as we know high bits are zero extended
        ret
```

Fixes llvm#53881
Fixes llvm#53622
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