[llvm] [CFI][annotation] Leave alone function pointers in function annotations (PR #80173)

[via llvm-commits]

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@@ -0,0 +1,46 @@
+; RUN: opt -passes=lowertypetests %s -o %t.o
+; RUN: llvm-dis %t.o -o - | FileCheck %s --check-prefix=CHECK-foobar
+; CHECK-foobar: {{llvm.global.annotations = .*[foo|bar], .*[foo|bar],}}
+; RUN: llvm-dis %t.o -o - | FileCheck %s --check-prefix=CHECK-cfi
+; CHECK-cfi-NOT: {{llvm.global.annotations = .*cfi.*}}
+
+target triple = "aarch64-none-linux-gnu"
+
+ at fptr = global ptr null, align 8
+ at .src = private unnamed_addr constant [7 x i8] c"test.c\00", align 1
+ at anon.eb4aa7a5d41c72267995d92d93c37bde.0 = private unnamed_addr constant { i16, i16, [14 x i8] } { i16 -1, i16 0, [14 x i8] c"'void (void)'\00" }
+ at .str = private unnamed_addr constant [30 x i8] c"annotation_string_literal_bar\00", section "llvm.metadata"
+ at .str.1 = private unnamed_addr constant [7 x i8] c"test.c\00", section "llvm.metadata"
+ at .str.2 = private unnamed_addr constant [30 x i8] c"annotation_string_literal_foo\00", section "llvm.metadata"
+ at llvm.global.annotations = appending global [2 x { ptr, ptr, ptr, i32, ptr }] [{ ptr, ptr, ptr, i32, ptr } { ptr @bar, ptr @.str, ptr @.str.1, i32 3, ptr null }, { ptr, ptr, ptr, i32, ptr } { ptr @foo, ptr @.str.2, ptr @.str.1, i32 2, ptr null }], section "llvm.metadata"
+
+define void @bar() {
+entry:
+  ret void
+}
+
+define void @test(i32 noundef %x) {
+entry:
+  %x.addr = alloca i32, align 4
+  store i32 %x, ptr %x.addr, align 4
+  %0 = load i32, ptr %x.addr, align 4
+  %cmp = icmp sgt i32 %0, 0
+  %1 = zext i1 %cmp to i64
+  %cond = select i1 %cmp, ptr @foo, ptr @bar
+  store ptr %cond, ptr @fptr, align 8
+  %2 = load ptr, ptr @fptr, align 8
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yozhu wrote:

I'll move `@fptr` from global to a function local variable. 

https://github.com/llvm/llvm-project/pull/80173