[llvm] [InstCombine] simplify `icmp pred x, ~x` (PR #73990)

[Yingwei Zheng via llvm-commits]

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@@ -5,6 +5,327 @@ declare void @llvm.assume(i1)
 declare void @barrier()
 declare void @use.i8(i8)
 
+; X s< ~X --> X s< 0
+define i1 @src_slt_xnx_to_slt_0_i1(i1 %x) {
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dtcxzyw wrote:

Please add some tests that commute operands (e.g., `icmp sgt ~X, X`).
And some negative tests (e.g., `icmp sgt X, ~Y`).


https://github.com/llvm/llvm-project/pull/73990