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authorManman Ren <manman.ren@gmail.com>2014-02-05 22:53:44 +0000
committerManman Ren <manman.ren@gmail.com>2014-02-05 22:53:44 +0000
commitdf7da79db6879032da83de83a90f981cacdb5f1a (patch)
treea1262d6b26806c03345754bba4861e3f9b250c98 /test
parent8147752976bda4499863c3db9feee760cf0b9015 (diff)
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Inliner uses a smaller inline threshold for callees with cold attribute.
Added command line option inlinecold-threshold to set threshold for inlining functions with cold attribute. Listen to the cold attribute when it would decrease the inline threshold. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200886 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test')
-rw-r--r--test/Transforms/Inline/inline-cold.ll88
1 files changed, 88 insertions, 0 deletions
diff --git a/test/Transforms/Inline/inline-cold.ll b/test/Transforms/Inline/inline-cold.ll
new file mode 100644
index 0000000000..bbf4e54be4
--- /dev/null
+++ b/test/Transforms/Inline/inline-cold.ll
@@ -0,0 +1,88 @@
+; RUN: opt < %s -inline -S | FileCheck %s
+
+; Test that functions with attribute Cold are not inlined while the
+; same function without attribute Cold will be inlined.
+
+@a = global i32 4
+
+; This function should be larger than the cold threshold (75), but smaller
+; than the regular threshold.
+; Function Attrs: nounwind readnone uwtable
+define i32 @simpleFunction(i32 %a) #0 {
+entry:
+ %a1 = load volatile i32* @a
+ %x1 = add i32 %a1, %a1
+ %a2 = load volatile i32* @a
+ %x2 = add i32 %x1, %a2
+ %a3 = load volatile i32* @a
+ %x3 = add i32 %x2, %a3
+ %a4 = load volatile i32* @a
+ %x4 = add i32 %x3, %a4
+ %a5 = load volatile i32* @a
+ %x5 = add i32 %x4, %a5
+ %a6 = load volatile i32* @a
+ %x6 = add i32 %x5, %a6
+ %a7 = load volatile i32* @a
+ %x7 = add i32 %x6, %a6
+ %a8 = load volatile i32* @a
+ %x8 = add i32 %x7, %a8
+ %a9 = load volatile i32* @a
+ %x9 = add i32 %x8, %a9
+ %a10 = load volatile i32* @a
+ %x10 = add i32 %x9, %a10
+ %a11 = load volatile i32* @a
+ %x11 = add i32 %x10, %a11
+ %a12 = load volatile i32* @a
+ %x12 = add i32 %x11, %a12
+ %add = add i32 %x12, %a
+ ret i32 %add
+}
+
+; Function Attrs: nounwind cold readnone uwtable
+define i32 @ColdFunction(i32 %a) #1 {
+; CHECK-LABEL: @ColdFunction
+; CHECK: ret
+entry:
+ %a1 = load volatile i32* @a
+ %x1 = add i32 %a1, %a1
+ %a2 = load volatile i32* @a
+ %x2 = add i32 %x1, %a2
+ %a3 = load volatile i32* @a
+ %x3 = add i32 %x2, %a3
+ %a4 = load volatile i32* @a
+ %x4 = add i32 %x3, %a4
+ %a5 = load volatile i32* @a
+ %x5 = add i32 %x4, %a5
+ %a6 = load volatile i32* @a
+ %x6 = add i32 %x5, %a6
+ %a7 = load volatile i32* @a
+ %x7 = add i32 %x6, %a6
+ %a8 = load volatile i32* @a
+ %x8 = add i32 %x7, %a8
+ %a9 = load volatile i32* @a
+ %x9 = add i32 %x8, %a9
+ %a10 = load volatile i32* @a
+ %x10 = add i32 %x9, %a10
+ %a11 = load volatile i32* @a
+ %x11 = add i32 %x10, %a11
+ %a12 = load volatile i32* @a
+ %x12 = add i32 %x11, %a12
+ %add = add i32 %x12, %a
+ ret i32 %add
+}
+
+; Function Attrs: nounwind readnone uwtable
+define i32 @bar(i32 %a) #0 {
+; CHECK-LABEL: @bar
+; CHECK: call i32 @ColdFunction(i32 5)
+; CHECK-NOT: call i32 @simpleFunction(i32 6)
+; CHECK: ret
+entry:
+ %0 = tail call i32 @ColdFunction(i32 5)
+ %1 = tail call i32 @simpleFunction(i32 6)
+ %add = add i32 %0, %1
+ ret i32 %add
+}
+
+attributes #0 = { nounwind readnone uwtable }
+attributes #1 = { nounwind cold readnone uwtable }