[llvm] [InstSimplify] Simplify select if it combinated `and/or/xor` (PR #73362)

[Yingwei Zheng via llvm-commits]

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@@ -4640,6 +4692,9 @@ static Value *simplifySelectWithICmpCond(Value *CondVal, Value *TrueVal,
     }
   }
 
+  if (Value *V = simplifySelectBitTestSpec(CmpLHS, CmpRHS, TrueVal, FalseVal))
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dtcxzyw wrote:

You should implement this logic in `simplifySelectWithICmpEq` (rebasing may be required).
Please add a negative test:
```
define i32 @src_select_and_eq0_or_xor(i32 %x, i32 %y) {
 ; CHECK-LABEL: @src_select_and_eq0_or_xor(
 ; CHECK-NEXT:    [[XOR:%.*]] = xor i32 [[X:%.*]], [[Y:%.*]]
 ; CHECK-NEXT:    ret i32 [[XOR]]
 ;
   %and = and i32 %x, %y
   %and0 = icmp slt i32 %and, 0
   %xor = xor i32 %x, %y
   %or = or i32 %x, %y
   %cond = select i1 %and0, i32 %or, i32 %xor
   ret i32 %cond
 }
```

Handling `ICMP_NE` is unnecessary because we always canonicalize `A != 0 ? C : D` into `A == 0 ? D : C`. See the code above this line:
https://github.com/llvm/llvm-project/blob/2bf01d73f6ebca11f36c17a65b7a86109d44681e/llvm/lib/Analysis/InstructionSimplify.cpp#L4620-L4624

https://github.com/llvm/llvm-project/pull/73362