[PATCH] D140381: [PowerPC] Use Power9 test data class instruction to lower IS_FPCLASS

[Qiu Chaofan via Phabricator via llvm-commits]

qiucf added inline comments.


================
Comment at: llvm/test/CodeGen/PowerPC/is_fpclass.ll:577
-; CHECK-NEXT:    li 3, 0
-; CHECK-NEXT:    isellt 3, 4, 3
 ; CHECK-NEXT:    blr
----------------
When return type is `zeroext i1`, this should be:

```
xscvdpspn 0, 1
mffprwz	3, 0
rlwinm 3, 3, 9, 23, 31
subfic 3, 3, 254
rldicl 3, 3, 1, 63
```

1 less instruction than new codegen.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D140381/new/

https://reviews.llvm.org/D140381