[llvm] [CGData][GMF] Skip No Params (PR #116548)

[Zhaoxuan Jiang via llvm-commits]

================
@@ -35,21 +36,30 @@ static cl::opt<unsigned> GlobalMergingMaxParams(
     cl::desc(
         "The maximum number of parameters allowed when merging functions."),
     cl::init(std::numeric_limits<unsigned>::max()), cl::Hidden);
-static cl::opt<unsigned> GlobalMergingParamOverhead(
+static cl::opt<bool> GlobalMergingSkipNoParams(
+    "global-merging-skip-no-params",
+    cl::desc("Skip merging functions with no parameters."), cl::init(false),
+    cl::Hidden);
+static cl::opt<double> GlobalMergingInstOverhead(
+    "global-merging-inst-overhead",
+    cl::desc("The overhead cost associated with each instruction when lowering "
+             "to machine instruction."),
+    cl::init(1.0), cl::Hidden);
----------------
nocchijiang wrote:

Just did a test with `1.2` and it delivered another 0.6% code size reduction on the same project I tested the effect of accurate `ParamCount`.

https://github.com/llvm/llvm-project/pull/116548