Add prefix based function layout when profile is available.
Summary: If a function is hot, put it in text.hot section.
Reviewers: davidxl
Subscribers: llvm-commits
Differential Revision: http://reviews.llvm.org/D17532
llvm-svn: 261607
diff --git a/llvm/test/CodeGen/X86/partition-sections.ll b/llvm/test/CodeGen/X86/partition-sections.ll
new file mode 100644
index 0000000..bc7d4b1
--- /dev/null
+++ b/llvm/test/CodeGen/X86/partition-sections.ll
@@ -0,0 +1,31 @@
+; RUN: llc < %s -mtriple=x86_64-pc-linux -group-functions-by-hotness=true | FileCheck %s -check-prefix=PARTITION
+; RUN: llc < %s -mtriple=x86_64-pc-linux -function-sections -group-functions-by-hotness=false | FileCheck %s -check-prefix=NO-PARTITION-FUNCTION-SECTION
+; RUN: llc < %s -mtriple=x86_64-pc-linux -function-sections -group-functions-by-hotness=true | FileCheck %s -check-prefix=PARTITION-FUNCTION-SECTION
+
+; PARTITION: .text.unlikely
+; PARTITION: .globl _Z3foov
+; NO-PARTITION-FUNCTION-SECTION: .text._Z3foov
+; PARTITION-FUNCTION-SECTION: .text.unlikely._Z3foov
+define i32 @_Z3foov() #0 {
+ ret i32 0
+}
+
+; PARTITION: .globl _Z3barv
+; NO-PARTITION-FUNCTION-SECTION: .text._Z3barv
+; PARTITION-FUNCTION-SECTION: .text.unlikely._Z3barv
+define i32 @_Z3barv() #1 !prof !0 {
+ ret i32 1
+}
+
+; PARTITION: .text
+; PARTITION: .globl _Z3bazv
+; NO-PARTITION-FUNCTION-SECTION: .text._Z3bazv
+; PARTITION-FUNCTION-SECTION: .text._Z3bazv
+define i32 @_Z3bazv() #1 {
+ ret i32 2
+}
+
+attributes #0 = { nounwind uwtable cold }
+attributes #1 = { nounwind uwtable }
+
+!0 = !{!"function_entry_count", i64 0}