[PATCH] D155876: [PowerPC] vector cost model add cost to extract i1

[ChenZheng via Phabricator via llvm-commits]

shchenz added inline comments.


================
Comment at: llvm/lib/Target/PowerPC/PPCTargetTransformInfo.cpp:738
+      return 3 + MaskCost;
+    }
   }
----------------
I must miss something. I compile following cases:
```
define i1 @ext_ext_or_reduction_v4i1(<4 x i1> %z) {
  %z1 = extractelement <4 x i1> %z, i32 1
  ret i1 %z1
}
```

```
define i32 @ext_ext_or_reduction_v4i32(<4 x i32> %z) {
  %z1 = extractelement <4 x i32> %z, i32 1
  ret i32 %z1
}
```

Seems llc generates exactly same instructions for them at both pwr9 and pwr8. So don't understand why here we need extra cost for i1 types, the i1 type must have some kinds of users?


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D155876/new/

https://reviews.llvm.org/D155876