[PATCH] D124325: [AArch64][SVE] Support logical operation BIC with DestructiveBinary patterns

[Paul Walker via Phabricator via llvm-commits]

paulwalker-arm added inline comments.


================
Comment at: llvm/lib/Target/AArch64/AArch64ExpandPseudoInsts.cpp:454-455
-
-  if (DType == AArch64::DestructiveBinary)
-    assert(DstReg != MI.getOperand(3).getReg());
-
----------------
Is it possible to move this logic into the `DOPRegIsUnique` switch statement like
```
case AArch64::DestructiveBinary:
  DOPRegIsUnique = DstReg != MI.getOperand(SrcIdx).getReg();
```



================
Comment at: llvm/lib/Target/AArch64/AArch64ExpandPseudoInsts.cpp:558
+    // prefixed_zeroing_mov for DestructiveBinary.
+    assert((AArch64::DestructiveBinary == DType || DOPRegIsUnique) &&
+           "The destructive operand should be unique");
----------------
I think this reads better as `DOPRegIsUnique || AArch64::DestructiveBinary == DType` because the second part os the exception.


================
Comment at: llvm/lib/Target/AArch64/AArch64ExpandPseudoInsts.cpp:575-576
+    // movprfx z0.b, p0/z, z0.b; lsl z0.b, p0/m, z0.b, #0;
+    if (DType == AArch64::DestructiveBinary &&
+        DstReg == MI.getOperand(SrcIdx).getReg()) {
+      BuildMI(MBB, MBBI, MI.getDebugLoc(), TII->get(LSLZero))
----------------
With my previous suggestion does
```
if (DType == AArch64::DestructiveBinary && !DOPRegIsUnique)
```
work here?



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  https://reviews.llvm.org/D124325/new/

https://reviews.llvm.org/D124325