[clang] [clang-tools-extra] [compiler-rt] [llvm] [Profile] Allow profile merging with multiple correlate files. (PR #75957)

[Ellis Hoag via cfe-commits]

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@@ -0,0 +1,33 @@
+// REQUIRES: lld-available
+// Test llvm-profdata merging with multiple correlation files mixing different correlation modes.
+
+// RUN: %clang_pgogen -o %t.normal -mllvm --disable-vp=true %S/../Inputs/instrprof-debug-info-correlate-main.cpp %S/../Inputs/instrprof-debug-info-correlate-foo.cpp
+// RUN: env LLVM_PROFILE_FILE=%t.profraw %run %t.normal
+// RUN: llvm-profdata merge -o %t.normal.profdata %t.profraw
+
+// Compiling with differnt configs.
+// RUN: %clang_pgogen -o %t -mllvm --disable-vp=true %S/../Inputs/instrprof-debug-info-correlate-main.cpp -c -o %t-main.o
+// RUN: %clang_pgogen -o %t -g -mllvm --debug-info-correlate -mllvm --disable-vp=true %S/../Inputs/instrprof-debug-info-correlate-main.cpp -c -o %t-main.debug.o
+// RUN: %clang_pgogen -o %t -g -mllvm --debug-info-correlate -mllvm --disable-vp=true %S/../Inputs/instrprof-debug-info-correlate-foo.cpp -fpic -shared -Wl,--build-id -o %t-libfoo.debug.so
+// RUN: %clang_pgogen -o %t -mllvm -profile-correlate=binary -mllvm --disable-vp=true %S/../Inputs/instrprof-debug-info-correlate-foo.cpp -fpic -shared -Wl,--build-id -o %t-libfoo.binary.so
+
+// Test mixing default raw profile and lightweight raw profile generated with debug info correlate.
+// The raw profiles are mixed in %t.proflite.
+// RUN: %clang_pgogen -o %t %t-main.o %t-libfoo.debug.so -Wl,--build-id -o %t
+// RUN: env LLVM_PROFILE_FILE=%t.proflite %run %t
+// RUN: llvm-profdata merge -o %t.profdata --debug-info=%t-libfoo.debug.so %t.proflite
+// RUN: diff <(llvm-profdata show --all-functions --counts %t.normal.profdata) <(llvm-profdata show --all-functions --counts %t.profdata)
+// Two separate raw profiles.
+// RUN: rm -rf %t.dir && mkdir %t.dir
+// RUN: env LLVM_PROFILE_FILE=%t.dir/raw%m.proflite %run %t
+// RUN: llvm-profdata merge -o %t.profdata --debug-info=%t-libfoo.debug.so %t.dir
+// RUN: diff <(llvm-profdata show --all-functions --counts %t.normal.profdata) <(llvm-profdata show --all-functions --counts %t.profdata)
+
+// Test lightweight raw profiles generated with debug info correlate and binary correlate.
+// Note we can not mix different correlation modes in static linking because when merging, the same correlate file can not be used for more than one correaltion mode.
----------------
ellishg wrote:

```suggestion
// Note we can not mix different correlation modes in static linking because when merging, the same correlate file can not be used for more than one correlation mode.
```

https://github.com/llvm/llvm-project/pull/75957