Skip expanding the intrinsic for __Canon

dotnet · Jan 18, 2024 · eb2b3a9 · eb2b3a9
1 parent afde0ce
commit eb2b3a9
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/src/coreclr/jit/importercalls.cpp b/src/coreclr/jit/importercalls.cpp
@@ -3375,6 +3375,13 @@ GenTree* Compiler::impIntrinsic(GenTree*                newobjThis,
                             {
                                 retNode = gtNewTrue();
                             }
+                            else if ((info.compCompHnd->getClassAttribs(hClass) & CORINFO_FLG_SHAREDINST) != 0)
+                            {
+                                // if we have no type arguments, check that the type itself is not __Canon, and
+                                // simply skip expanding the intrinsic in that case, rather than incorrectly
+                                // hardcoding 'false' as the resulting expression.
+                                retNode = nullptr;
+                            }
                             else
                             {
                                 retNode = gtNewFalse();