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| author | Justin Bogner <mail@justinbogner.com> | 2013-11-12 21:44:01 +0000 |
|---|---|---|
| committer | Justin Bogner <mail@justinbogner.com> | 2013-11-12 21:44:01 +0000 |
| commit | dc6b4b4fc2665eea17684d29e4dae219b258b5ef (patch) | |
| tree | 3098f3760218f627a65eb20fe6b2935d088dfe63 /test/LTO | |
| parent | 59e648e3c8966e0678902a2994558f25c8573ce4 (diff) | |
| download | external_llvm-dc6b4b4fc2665eea17684d29e4dae219b258b5ef.zip external_llvm-dc6b4b4fc2665eea17684d29e4dae219b258b5ef.tar.gz external_llvm-dc6b4b4fc2665eea17684d29e4dae219b258b5ef.tar.bz2 | |
Protect user-supplied runtime library functions in LTO
Add user-supplied C runtime and compiler-rt library functions to
llvm.compiler.used to protect them from premature optimization by
passes like -globalopt and -ipsccp. Calls to (seemingly unused)
runtime library functions can be added by -instcombine and instruction
lowering.
Patch by Duncan Exon Smith, thanks!
Fixes <rdar://problem/14740087>
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194514 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/LTO')
| -rw-r--r-- | test/LTO/runtime-library.ll | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/test/LTO/runtime-library.ll b/test/LTO/runtime-library.ll new file mode 100644 index 0000000..76fc6f0 --- /dev/null +++ b/test/LTO/runtime-library.ll @@ -0,0 +1,27 @@ +; runtime library implementations should be added to llvm.compiler.used +; RUN: llvm-as <%s >%t1 +; RUN: llvm-lto -o %t2 %t1 +; RUN: llvm-nm -no-sort %t2 | FileCheck %s -check-prefix=KEEP -check-prefix=LOSE + +target triple = "x86_64-apple-darwin9" + +; KEEP-LABEL: _puts +define void @puts() { + ret void +} + +; KEEP-LABEL: ___divti3 +define void @__divti3() { + ret void +} + +; KEEP-LABEL: _memset +define void @memset() { + ret void +} + +; LOSE-NOT: _myprintf +define void @myprintf() { + ret void +} + |