Add test.

Author: rlavaee

llvm/test/CodeGen/X86/prefetch-symbols.ll

@@ -0,0 +1,42 @@
+;; Check that specifying the function in the basic block sections profile
+;; without any other directives is a noop.
+;;
+;; Specify the bb sections profile:
+; RUN: echo 'v1' > %t
+; RUN: echo 'f _Z3foob' >> %t
+; RUN: echo 't 0@0' >> %t
+;;
+; RUN: llc < %s -mtriple=x86_64-pc-linux -function-sections -basic-block-sections=%t  | FileCheck
+
+define i32 @_Z3foob(i1 zeroext %0) nounwind {
+  %2 = alloca i32, align 4
+  %3 = alloca i8, align 1
+  %4 = zext i1 %0 to i8
+  store i8 %4, ptr %3, align 1
+  %5 = load i8, ptr %3, align 1
+  %6 = trunc i8 %5 to i1
+  %7 = zext i1 %6 to i32
+  %8 = icmp sgt i32 %7, 0
+  br i1 %8, label %9, label %11
+
+9:                                                ; preds = %1
+  %10 = call i32 @_Z3barv()
+  store i32 %10, ptr %2, align 4
+  br label %13
+
+11:                                               ; preds = %1
+  %12 = call i32 @_Z3bazv()
+  store i32 %12, ptr %2, align 4
+  br label %13
+
+13:                                               ; preds = %11, %9
+  %14 = load i32, ptr %2, align 4
+  ret i32 %14
+}
+
+declare i32 @_Z3barv() #1
+declare i32 @_Z3bazv() #1
+
+
+; CHECK: _Z3foob
+; CHECK: llvm_prefetch_target