Expose -mllvm -accurate-sample-profile to clang.

Summary: With accurate sample profile, we can do more aggressive size optimization. For some size-critical application, this can reduce the text size by 20%

Reviewers: davidxl, rsmith

Reviewed By: davidxl, rsmith

Subscribers: mehdi_amini, eraman, sanjoy, cfe-commits

Differential Revision: https://reviews.llvm.org/D37091

llvm-svn: 311707

1 files changed, 9 insertions, 0 deletions

diff --git a/clang/test/Integration/thinlto_profile_sample_accurate.c b/clang/test/Integration/thinlto_profile_sample_accurate.c
new file mode 100644
index 00000000000..d7966c215cb
--- /dev/null
+++ b/clang/test/Integration/thinlto_profile_sample_accurate.c
@@ -0,0 +1,9 @@
+// Test to ensure -emit-llvm profile-sample-accurate is honored in ThinLTO.
+// RUN: %clang -O2 %s -flto=thin -fprofile-sample-accurate -c -o %t.o
+// RUN: llvm-lto -thinlto -o %t %t.o
+// RUN: %clang_cc1 -O2 -x ir %t.o -fthinlto-index=%t.thinlto.bc -emit-llvm -o - | FileCheck %s
+
+// CHECK: define void @foo()
+// CHECK: attributes {{.*}} "profile-sample-accurate"
+void foo() {
+}