[llvm] [GlobalOpt][FMV] Fix static resolution of calls. (PR #160011)

[Alexandros Lamprineas via llvm-commits]

================
@@ -340,14 +433,167 @@ entry:
 
 define i32 @caller7.default() #0 {
 ; CHECK-LABEL: define i32 @caller7.default(
-; CHECK-SAME: ) local_unnamed_addr #[[ATTR0]] {
+; CHECK-SAME: ) #[[ATTR0]] {
 ; CHECK:    [[CALL:%.*]] = tail call i32 @test_alternative_names.default()
 ;
 entry:
   %call = tail call i32 @test_alternative_names()
   ret i32 %call
 }
 
+define weak_odr ptr @caller7.resolver() comdat {
+; CHECK-LABEL: define weak_odr ptr @caller7.resolver() comdat {
+resolver_entry:
+  tail call void @__init_cpu_features_resolver()
+  %0 = load i64, ptr @__aarch64_cpu_features, align 8
+  %1 = and i64 %0, 17563904
+  %2 = icmp eq i64 %1, 17563904
+  br i1 %2, label %common.ret, label %resolver_else
+
+common.ret:                                       ; preds = %resolver_else2, %resolver_else, %resolver_entry
+  %common.ret.op = phi ptr [ @caller7._Mdpb2Mfrintts, %resolver_entry ], [ @caller7._Mfrintts, %resolver_else ], [ %caller7._Mrcpc2.caller7.default, %resolver_else2 ]
+  ret ptr %common.ret.op
+
+resolver_else:                                    ; preds = %resolver_entry
+  %3 = and i64 %0, 16777472
+  %4 = icmp eq i64 %3, 16777472
+  br i1 %4, label %common.ret, label %resolver_else2
+
+resolver_else2:                                   ; preds = %resolver_else
+  %5 = and i64 %0, 12582912
+  %6 = icmp eq i64 %5, 12582912
+  %caller7._Mrcpc2.caller7.default = select i1 %6, ptr @caller7._Mrcpc2, ptr @caller7.default
+  br label %common.ret
+}
+
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labrinea wrote:

The top of trunk seems to be crashing with the newly added test below https://godbolt.org/z/nqz7ePrfa

https://github.com/llvm/llvm-project/pull/160011