Imported Upstream version 5.18.0.205

Former-commit-id: 7f59f7e792705db773f1caecdaa823092f4e2927

external/llvm/test/Transforms/ConstProp/2002-05-03-NotOperator.ll

@@ -0,0 +1,19 @@
+; This bug has to do with the fact that constant propagation was implemented in
+; terms of _logical_ not (! in C) instead of _bitwise_ not (~ in C).  This was
+; due to a spec change.
+
+; Fix #2: The unary not instruction now no longer exists. Change to xor.
+
+; RUN: opt < %s -constprop -S | \
+; RUN:   not grep "i32 0"
+
+define i32 @test1() {
+        %R = xor i32 123, -1            ; <i32> [#uses=1]
+        ret i32 %R
+}
+
+define i32 @test2() {
+        %R = xor i32 -123, -1           ; <i32> [#uses=1]
+        ret i32 %R
+}
+