[LLD] Do not combine cg_profile from obj and ordering file (#121325)

cg_profile in object is from CGProfilePass and it is often inaccurate. While call-graph-ordering-file is provided by user. It is weird to aggregate them together especially when call-graph-ordering-file is accurate enough.
llvm · Jan 5, 2025 · 2d9d291 · 2d9d291
1 parent 36dd421
commit 2d9d291
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Showing 4 changed files with 14 additions and 13 deletions.
diff --git a/lld/COFF/Driver.cpp b/lld/COFF/Driver.cpp
@@ -2878,10 +2878,10 @@ void LinkerDriver::linkerMain(ArrayRef<const char *> argsArr) {
   // Handle /call-graph-ordering-file and /call-graph-profile-sort (default on).
   if (config->callGraphProfileSort) {
     llvm::TimeTraceScope timeScope("Call graph");
-    if (auto *arg = args.getLastArg(OPT_call_graph_ordering_file)) {
+    if (auto *arg = args.getLastArg(OPT_call_graph_ordering_file))
       parseCallGraphFile(arg->getValue());
-    }
-    readCallGraphsFromObjectFiles(ctx);
+    else
+      readCallGraphsFromObjectFiles(ctx);
   }
 
   // Handle /print-symbol-order.

diff --git a/lld/ELF/Driver.cpp b/lld/ELF/Driver.cpp
@@ -3215,11 +3215,12 @@ template <class ELFT> void LinkerDriver::link(opt::InputArgList &args) {
 
   // Read the callgraph now that we know what was gced or icfed
   if (ctx.arg.callGraphProfileSort != CGProfileSortKind::None) {
-    if (auto *arg = args.getLastArg(OPT_call_graph_ordering_file))
+    if (auto *arg = args.getLastArg(OPT_call_graph_ordering_file)) {
       if (std::optional<MemoryBufferRef> buffer =
               readFile(ctx, arg->getValue()))
         readCallGraph(ctx, *buffer);
-    readCallGraphsFromObjectFiles<ELFT>(ctx);
+    } else
+      readCallGraphsFromObjectFiles<ELFT>(ctx);
   }
 
   // Write the result to the file.

diff --git a/lld/test/COFF/cgprofile-obj.s b/lld/test/COFF/cgprofile-obj.s
@@ -46,7 +46,7 @@ Aa:
 # NO-CG: 140001002 T B
 # NO-CG: 140001003 T A
 
-# CG-OBJ-OF: 140001000 T C
-# CG-OBJ-OF: 140001001 t D
-# CG-OBJ-OF: 140001002 T A
-# CG-OBJ-OF: 140001003 T B
+# CG-OBJ-OF: 140001000 t D
+# CG-OBJ-OF: 140001001 T A
+# CG-OBJ-OF: 140001004 T C
+# CG-OBJ-OF: 140001005 T B
diff --git a/lld/test/ELF/cgprofile-obj.s b/lld/test/ELF/cgprofile-obj.s
@@ -49,7 +49,7 @@ Aa:
 # NO-CG: 0000000000201122 T B
 # NO-CG: 0000000000201123 T A
 
-# CG-OBJ-OF: 0000000000201121 t D
-# CG-OBJ-OF: 0000000000201120 T C
-# CG-OBJ-OF: 0000000000201123 T B
-# CG-OBJ-OF: 0000000000201122 T A
+# CG-OBJ-OF: 0000000000201120 t D
+# CG-OBJ-OF: 0000000000201124 T C
+# CG-OBJ-OF: 0000000000201125 T B
+# CG-OBJ-OF: 0000000000201121 T A