1 files changed, 84 insertions, 0 deletions
diff --git a/llvm/test/Transforms/CodeGenPrepare/section.ll b/llvm/test/Transforms/CodeGenPrepare/section.ll
new file mode 100644
index 00000000000..30598ba7afb
--- /dev/null
+++ b/llvm/test/Transforms/CodeGenPrepare/section.ll
@@ -0,0 +1,84 @@
+; RUN: opt < %s -codegenprepare -S | FileCheck %s
+
+target triple = "x86_64-pc-linux-gnu"
+
+; This tests that hot/cold functions get correct section prefix assigned
+
+; CHECK: hot_func1{{.*}}!section_prefix ![[HOT_ID:[0-9]+]]
+; The entry is hot
+define void @hot_func1() !prof !15 {
+  ret void
+}
+
+; CHECK: hot_func2{{.*}}!section_prefix ![[HOT_ID:[0-9]+]]
+; Entry is cold but inner block is hot
+define void @hot_func2(i32 %n) !prof !16 {
+entry:
+  %n.addr = alloca i32, align 4
+  %i = alloca i32, align 4
+  store i32 %n, i32* %n.addr, align 4
+  store i32 0, i32* %i, align 4
+  br label %for.cond
+
+for.cond:
+  %0 = load i32, i32* %i, align 4
+  %1 = load i32, i32* %n.addr, align 4
+  %cmp = icmp slt i32 %0, %1
+  br i1 %cmp, label %for.body, label %for.end, !prof !19
+
+for.body:
+  %2 = load i32, i32* %i, align 4
+  %inc = add nsw i32 %2, 1
+  store i32 %inc, i32* %i, align 4
+  br label %for.cond
+
+for.end:
+  ret void
+}
+
+; For instrumentation based PGO, we should only look at block counts,
+; not call site VP metadata (which can exist on value profiled memcpy,
+; or possibly left behind after static analysis based devirtualization).
+; CHECK: cold_func1{{.*}}!section_prefix ![[COLD_ID:[0-9]+]]
+define void @cold_func1() !prof !16 {
+  call void @hot_func1(), !prof !17
+  call void @hot_func1(), !prof !17
+  ret void
+}
+
+; CHECK: cold_func2{{.*}}!section_prefix ![[COLD_ID]]
+define void @cold_func2() !prof !16 {
+  call void @hot_func1(), !prof !17
+  call void @hot_func1(), !prof !18
+  call void @hot_func1(), !prof !18
+  ret void
+}
+
+; CHECK: cold_func3{{.*}}!section_prefix ![[COLD_ID]]
+define void @cold_func3() !prof !16 {
+  call void @hot_func1(), !prof !18
+  ret void
+}
+
+; CHECK: ![[HOT_ID]] = !{!"function_section_prefix", !".hot"}
+; CHECK: ![[COLD_ID]] = !{!"function_section_prefix", !".unlikely"}
+!llvm.module.flags = !{!1}
+!1 = !{i32 1, !"ProfileSummary", !2}
+!2 = !{!3, !4, !5, !6, !7, !8, !9, !10}
+!3 = !{!"ProfileFormat", !"InstrProf"}
+!4 = !{!"TotalCount", i64 10000}
+!5 = !{!"MaxCount", i64 1000}
+!6 = !{!"MaxInternalCount", i64 1}
+!7 = !{!"MaxFunctionCount", i64 1000}
+!8 = !{!"NumCounts", i64 3}
+!9 = !{!"NumFunctions", i64 3}
+!10 = !{!"DetailedSummary", !11}
+!11 = !{!12, !13, !14}
+!12 = !{i32 10000, i64 100, i32 1}
+!13 = !{i32 999000, i64 100, i32 1}
+!14 = !{i32 999999, i64 1, i32 2}
+!15 = !{!"function_entry_count", i64 1000}
+!16 = !{!"function_entry_count", i64 1}
+!17 = !{!"branch_weights", i32 80}
+!18 = !{!"branch_weights", i32 1}
+!19 = !{!"branch_weights", i32 1000, i32 1}