[PATCH] D136383: [PartialInlining] Enable recursive partial inlining.

[Mark Lacey via Phabricator via llvm-commits]

rudkx updated this revision to Diff 474875.
rudkx added a comment.

Update test case to not use --simplify-cfg.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D136383/new/

https://reviews.llvm.org/D136383

Files:
  llvm/lib/Transforms/IPO/PartialInlining.cpp
  llvm/test/Transforms/PartialInlining/recursive_partial_inlining.ll


Index: llvm/test/Transforms/PartialInlining/recursive_partial_inlining.ll
===================================================================
--- /dev/null
+++ llvm/test/Transforms/PartialInlining/recursive_partial_inlining.ll
@@ -0,0 +1,31 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -partial-inliner -skip-partial-inlining-cost-analysis -S < %s | FileCheck %s
+define void @_Z26recursive_partial_inliningi(i32 noundef %i) local_unnamed_addr {
+; CHECK-LABEL: @_Z26recursive_partial_inliningi(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[CMP:%.*]] = icmp slt i32 [[I:%.*]], 0
+; CHECK-NEXT:    br i1 [[CMP]], label [[COMMON_RET2:%.*]], label [[IF_END:%.*]]
+; CHECK:       common.ret2:
+; CHECK-NEXT:    ret void
+; CHECK:       if.end:
+; CHECK-NEXT:    [[SUB:%.*]] = add nsw i32 [[I]], -1
+; CHECK-NEXT:    [[CMP_I:%.*]] = icmp slt i32 [[SUB]], 0
+; CHECK-NEXT:    br i1 [[CMP_I]], label [[_Z26RECURSIVE_PARTIAL_INLININGI_1_EXIT:%.*]], label [[CODEREPL_I:%.*]]
+; CHECK:       codeRepl.i:
+; CHECK-NEXT:    call void @_Z26recursive_partial_inliningi.1.if.end(i32 [[SUB]])
+; CHECK-NEXT:    br label [[_Z26RECURSIVE_PARTIAL_INLININGI_1_EXIT]]
+; CHECK:       _Z26recursive_partial_inliningi.1.exit:
+; CHECK-NEXT:    br label [[COMMON_RET2]]
+;
+entry:
+  %cmp = icmp slt i32 %i, 0
+  br i1 %cmp, label %common.ret2, label %if.end
+
+common.ret2:                                      ; preds = %entry, %if.end
+  ret void
+
+if.end:                                           ; preds = %entry
+  %sub = add nsw i32 %i, -1
+  tail call void @_Z26recursive_partial_inliningi(i32 noundef %sub)
+  br label %common.ret2
+}
Index: llvm/lib/Transforms/IPO/PartialInlining.cpp
===================================================================
--- llvm/lib/Transforms/IPO/PartialInlining.cpp
+++ llvm/lib/Transforms/IPO/PartialInlining.cpp
@@ -1490,16 +1490,6 @@
     if (CurrFunc->use_empty())
       continue;
 
-    bool Recursive = false;
-    for (User *U : CurrFunc->users())
-      if (Instruction *I = dyn_cast<Instruction>(U))
-        if (I->getParent()->getParent() == CurrFunc) {
-          Recursive = true;
-          break;
-        }
-    if (Recursive)
-      continue;
-
     std::pair<bool, Function *> Result = unswitchFunction(*CurrFunc);
     if (Result.second)
       Worklist.push_back(Result.second);


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