[llvm] [X86] ICMP EQ/NE MIN_SIGNED_INT - avoid immediate argument by using NEG + SETO/SETNO (PR #94948)

[Phoebe Wang via llvm-commits]

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@@ -23816,6 +23816,20 @@ SDValue X86TargetLowering::emitFlagsForSetcc(SDValue Op0, SDValue Op1,
       }
     }
 
+    // Look for X == INT_MIN or X != INT_MIN. We can use NEG and test for
+    // overflow.
+    if (isMinSignedConstant(Op1)) {
+      EVT VT = Op0.getValueType();
+      if ((VT == MVT::i32 || VT == MVT::i64) || Op0->hasOneUse()) {
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phoebewang wrote:

The parentheses of `(VT == MVT::i32 || VT == MVT::i64)` isn't necessary.

https://github.com/llvm/llvm-project/pull/94948