The 'optnone' attribute means don't inline anything into this function

(except functions marked always_inline).
Functions with 'optnone' must also have 'noinline' so they don't get
inlined into any other function.

Based on work by Andrea Di Biagio.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@195046 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 57 insertions, 5 deletions

diff --git a/test/Bitcode/attributes.ll b/test/Bitcode/attributes.ll
index 2ff87d6..1789878 100644
--- a/test/Bitcode/attributes.ll
+++ b/test/Bitcode/attributes.ll
@@ -207,7 +207,7 @@ define void @f34()
         ret void;
 }
 
-define void @f35() optnone
+define void @f35() optnone noinline
 ; CHECK: define void @f35() #23
 {
         ret void;
@@ -236,6 +236,6 @@ define void @f35() optnone
 ; CHECK: attributes #20 = { "cpu"="cortex-a8" }
 ; CHECK: attributes #21 = { sspstrong }
 ; CHECK: attributes #22 = { minsize }
-; CHECK: attributes #23 = { optnone }
+; CHECK: attributes #23 = { noinline optnone }
 ; CHECK: attributes #24 = { nobuiltin }
 
diff --git a/test/Feature/optnone.ll b/test/Feature/optnone.ll
index ec1d723..7d8afd4 100644
--- a/test/Feature/optnone.ll
+++ b/test/Feature/optnone.ll
@@ -1,12 +1,12 @@
 ; RUN: llvm-as < %s | llvm-dis | FileCheck %s
 
-; Check for the presence of attribute noopt in the disassembly.
+; Check for the presence of attribute optnone in the disassembly.
 
 ; CHECK: @foo() #0
 define void @foo() #0 {
   ret void
 }
 
-; CHECK: attributes #0 = { optnone }
-attributes #0 = { optnone }
+; CHECK: attributes #0 = { noinline optnone }
+attributes #0 = { optnone noinline }
 
diff --git a/test/Transforms/Inline/inline-optnone.ll b/test/Transforms/Inline/inline-optnone.ll
new file mode 100644
index 0000000..9b99c45
--- /dev/null
+++ b/test/Transforms/Inline/inline-optnone.ll
@@ -0,0 +1,52 @@
+; RUN: opt < %s -inline -S | FileCheck %s
+
+; Test that functions with attribute optnone are not inlined.
+; Also test that only functions with attribute alwaysinline are
+; valid candidates for inlining if the caller has the optnone attribute.
+
+; Function Attrs: alwaysinline nounwind readnone uwtable
+define i32 @alwaysInlineFunction(i32 %a) #0 {
+entry:
+  %mul = mul i32 %a, %a
+  ret i32 %mul
+}
+
+; Function Attrs: nounwind readnone uwtable
+define i32 @simpleFunction(i32 %a) #1 {
+entry:
+  %add = add i32 %a, %a
+  ret i32 %add
+}
+
+; Function Attrs: nounwind noinline optnone readnone uwtable
+define i32 @OptnoneFunction(i32 %a) #2 {
+entry:
+  %0 = tail call i32 @alwaysInlineFunction(i32 %a)
+  %1 = tail call i32 @simpleFunction(i32 %a)
+  %add = add i32 %0, %1
+  ret i32 %add
+}
+
+; CHECK-LABEL: @OptnoneFunction
+; CHECK-NOT: call i32 @alwaysInlineFunction(i32 %a)
+; CHECK: call i32 @simpleFunction(i32 %a)
+; CHECK: ret
+
+; Function Attrs: nounwind readnone uwtable
+define i32 @bar(i32 %a) #1 {
+entry:
+  %0 = tail call i32 @OptnoneFunction(i32 5)
+  %1 = tail call i32 @simpleFunction(i32 6)
+  %add = add i32 %0, %1
+  ret i32 %add
+}
+
+; CHECK-LABEL: @bar
+; CHECK: call i32 @OptnoneFunction(i32 5)
+; CHECK-NOT: call i32 @simpleFunction(i32 6)
+; CHECK: ret
+
+
+attributes #0 = { alwaysinline nounwind readnone uwtable }
+attributes #1 = { nounwind readnone uwtable }
+attributes #2 = { nounwind noinline optnone readnone uwtable }