[llvm] [StructuralHash] Global Variable (PR #118412)

[Kyungwoo Lee via llvm-commits]

================
@@ -0,0 +1,52 @@
+; This test verifies that global variables are hashed based on their initial contents,
+; allowing them to be outlined even if they appear different due to their names.
+
+; RUN: split-file %s %t
+
+; Check if the outlined function is created locally.
+; RUN: llc -mtriple=arm64-apple-darwin -enable-machine-outliner -codegen-data-generate=true  -aarch64-enable-collect-loh=false -filetype=obj %t/local-two.ll -o %t_write_base
+; RUN: llvm-objdump -d %t_write_base | FileCheck %s
+
+; RUN: llvm-cgdata --merge %t_write_base -o %t_cgdata_base
+
+; Read the cgdata in the machine outliner for optimistically outlining in local-one.ll.
+; RUN: llc -mtriple=arm64-apple-darwin -enable-machine-outliner -codegen-data-use-path=%t_cgdata_base  -aarch64-enable-collect-loh=false -append-content-hash-outlined-name=false -filetype=obj %t/local-one.ll -o %t_read_base
+; RUN: llvm-objdump -d %t_read_base | FileCheck %s
+
+; The names of globals `.str` and `.str.4` are different, but their initial contents are identical.
+; The outlined function now starts with a reference to that global ("hello\00").
----------------
kyulee-com wrote:

Restructured the test cases.

https://github.com/llvm/llvm-project/pull/118412