[llvm] [AMDGPU] Extend promotion of alloca to vectors (PR #127973)

[Shilei Tian via llvm-commits]

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@@ -66,6 +66,18 @@ static cl::opt<unsigned> PromoteAllocaToVectorLimit(
     cl::desc("Maximum byte size to consider promote alloca to vector"),
     cl::init(0));
 
+static cl::opt<unsigned> PromoteAllocaToVectorMaxElements(
+    "amdgpu-promote-alloca-to-vector-max-elements",
+    cl::desc("Maximum vector size (in elements) to use when promoting alloca"),
+    cl::init(16));
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shiltian wrote:

Okay. The reason I was asking is, if we expect any uses from users, we need to expose them as an option instead of a pass option, but based on your description, we don't expect from end users, and compiler front end can tune it via function attributes.

https://github.com/llvm/llvm-project/pull/127973