diff options
| -rw-r--r-- | llvm/test/CodeGen/Generic/dont-remove-empty-preheader.ll | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/Generic/dont-remove-empty-preheader.ll b/llvm/test/CodeGen/Generic/dont-remove-empty-preheader.ll new file mode 100644 index 00000000000..36af1ffa8ba --- /dev/null +++ b/llvm/test/CodeGen/Generic/dont-remove-empty-preheader.ll @@ -0,0 +1,39 @@ +; RUN: opt -codegenprepare -S < %s | FileCheck %s +; CHECK: for.body.preheader + +@N = common global i32 0, align 4 +@E = common global i8** null, align 8 +@B = common global i8** null, align 8 + +; Function Attrs: nounwind +define i32 @foo() { +entry: + %0 = load i32, i32* @N, align 4 + %1 = load i8**, i8*** @E, align 8 + %2 = load i8**, i8*** @B, align 8 + %cmp7 = icmp eq i8** %2, %1 + br i1 %cmp7, label %for.cond.cleanup, label %for.body.preheader + +for.body.preheader: ; preds = %entry + br label %for.body + +for.cond.cleanup.loopexit: ; preds = %for.body + %add.lcssa = phi i32 [ %add, %for.body ] + br label %for.cond.cleanup + +for.cond.cleanup: ; preds = %for.cond.cleanup.loopexit, %entry + %n.0.lcssa = phi i32 [ %0, %entry ], [ %add.lcssa, %for.cond.cleanup.loopexit ] + ret i32 %n.0.lcssa + +for.body: ; preds = %for.body.preheader, %for.body + %I.09 = phi i8** [ %incdec.ptr, %for.body ], [ %2, %for.body.preheader ] + %n.08 = phi i32 [ %add, %for.body ], [ %0, %for.body.preheader ] + %3 = load i8*, i8** %I.09, align 8 + %call = tail call i32 @map(i8* %3) + %add = add nsw i32 %call, %n.08 + %incdec.ptr = getelementptr inbounds i8*, i8** %I.09, i64 1 + %cmp = icmp eq i8** %incdec.ptr, %1 + br i1 %cmp, label %for.cond.cleanup.loopexit, label %for.body +} + +declare i32 @map(i8*) |
