Inline a function when the always_inline attribute

is set even when it contains a indirect branch.
The attribute overrules correctness concerns
like the escape of a local block address.

This is for rdar://16501761

llvm-svn: 206429

1 files changed, 26 insertions, 0 deletions

diff --git a/llvm/test/Transforms/Inline/always-inline-attribute.ll b/llvm/test/Transforms/Inline/always-inline-attribute.ll
new file mode 100644
index 00000000000..c146122e163
--- /dev/null
+++ b/llvm/test/Transforms/Inline/always-inline-attribute.ll
@@ -0,0 +1,26 @@
+; RUN: opt < %s -O3 -S | FileCheck %s
+@gv = external global i32
+
+define i32 @main() nounwind {
+; CHECK-NOT: call i32 @foo
+  %1 = load i32* @gv, align 4
+  %2 = tail call i32 @foo(i32 %1)
+  unreachable
+}
+
+define internal i32 @foo(i32) alwaysinline {
+  br label %2
+
+; <label>:2                                       ; preds = %8, %1
+  %3 = phi i32 [ %0, %1 ], [ %10, %8 ]
+  %4 = phi i8* [ blockaddress(@foo, %2), %1 ], [ %6, %8 ]
+  %5 = icmp eq i32 %3, 1
+  %6 = select i1 %5, i8* blockaddress(@foo, %8), i8* %4
+  %7 = add nsw i32 %3, -1
+  br label %8
+
+; <label>:8                                       ; preds = %8, %2
+  %9 = phi i32 [ %7, %2 ], [ %10, %8 ]
+  %10 = add nsw i32 %9, -1
+  indirectbr i8* %6, [label %2, label %8]
+}