[PATCH] D49162: [Inliner] Teach inliner to merge 'min-legal-vector-width' function attribute

[Phabricator via Phabricator via llvm-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rL337844: [Inliner] Teach inliner to merge 'min-legal-vector-width' function attribute (authored by ctopper, committed by ).

Changed prior to commit:
  https://reviews.llvm.org/D49162?vs=157081&id=157094#toc

Repository:
  rL LLVM

https://reviews.llvm.org/D49162

Files:
  llvm/trunk/include/llvm/IR/Attributes.td
  llvm/trunk/lib/IR/Attributes.cpp


Index: llvm/trunk/include/llvm/IR/Attributes.td
===================================================================
--- llvm/trunk/include/llvm/IR/Attributes.td
+++ llvm/trunk/include/llvm/IR/Attributes.td
@@ -235,3 +235,4 @@
 def : MergeRule<"adjustCallerSSPLevel">;
 def : MergeRule<"adjustCallerStackProbes">;
 def : MergeRule<"adjustCallerStackProbeSize">;
+def : MergeRule<"adjustMinLegalVectorWidth">;
Index: llvm/trunk/lib/IR/Attributes.cpp
===================================================================
--- llvm/trunk/lib/IR/Attributes.cpp
+++ llvm/trunk/lib/IR/Attributes.cpp
@@ -1682,6 +1682,33 @@
   }
 }
 
+/// If the inlined function defines a min legal vector width, then ensure
+/// the calling function has the same or larger min legal vector width. This
+/// function is called after the inlining decision has been made so we have to
+/// merge the attribute this way. Heuristics that would use
+/// min-legal-vector-width to determine inline compatibility would need to be
+/// handled as part of inline cost analysis.
+static void
+adjustMinLegalVectorWidth(Function &Caller, const Function &Callee) {
+  if (Callee.hasFnAttribute("min-legal-vector-width")) {
+    uint64_t CalleeVectorWidth;
+    Callee.getFnAttribute("min-legal-vector-width")
+          .getValueAsString()
+          .getAsInteger(0, CalleeVectorWidth);
+    if (Caller.hasFnAttribute("min-legal-vector-width")) {
+      uint64_t CallerVectorWidth;
+      Caller.getFnAttribute("min-legal-vector-width")
+            .getValueAsString()
+            .getAsInteger(0, CallerVectorWidth);
+      if (CallerVectorWidth < CalleeVectorWidth) {
+        Caller.addFnAttr(Callee.getFnAttribute("min-legal-vector-width"));
+      }
+    } else {
+      Caller.addFnAttr(Callee.getFnAttribute("min-legal-vector-width"));
+    }
+  }
+}
+
 #define GET_ATTR_COMPAT_FUNC
 #include "AttributesCompatFunc.inc"
 


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