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| author | Ahmed Bougacha <ahmed.bougacha@gmail.com> | 2015-04-01 00:45:09 +0000 |
|---|---|---|
| committer | Ahmed Bougacha <ahmed.bougacha@gmail.com> | 2015-04-01 00:45:09 +0000 |
| commit | 408d010a7cfc97065d71869de2209b6f3681d0ce (patch) | |
| tree | 8d83f913fe2ae53598264b831561bc201a6eced7 /llvm/test/Transforms/CodeGenPrepare | |
| parent | 50271aae7e0f7c560121f70245537e4b3d66dc42 (diff) | |
| download | bcm5719-llvm-408d010a7cfc97065d71869de2209b6f3681d0ce.tar.gz bcm5719-llvm-408d010a7cfc97065d71869de2209b6f3681d0ce.zip | |
[SimplifyLibCalls] Ignore nobuiltin/unavailable fortified libcalls.
We used to do this before refactorings around r225640.
Some clang users checked for _chk libcall availability using:
__has_builtin(__builtin___memcpy_chk)
When compiling with -fno-builtin, this is always true.
When passing -ffreestanding/-mkernel, which both imply -fno-builtin, we
end up with fortified libcalls, which isn't acceptable in a freestanding
environment which only provides their non-fortified counterparts.
Until we change clang and/or teach external users to check for availability
differently, disregard the "nobuiltin" attribute and TLI::has.
Workaround for PR23093.
llvm-svn: 233776
Diffstat (limited to 'llvm/test/Transforms/CodeGenPrepare')
| -rw-r--r-- | llvm/test/Transforms/CodeGenPrepare/X86/memset_chk-simplify-nobuiltin.ll | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/llvm/test/Transforms/CodeGenPrepare/X86/memset_chk-simplify-nobuiltin.ll b/llvm/test/Transforms/CodeGenPrepare/X86/memset_chk-simplify-nobuiltin.ll new file mode 100644 index 00000000000..1e12c0192a9 --- /dev/null +++ b/llvm/test/Transforms/CodeGenPrepare/X86/memset_chk-simplify-nobuiltin.ll @@ -0,0 +1,18 @@ +; RUN: opt -S -disable-simplify-libcalls -codegenprepare < %s | FileCheck %s +target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128" + +; This is a workaround for PR23093: when building with -mkernel/-fno-builtin, +; we still generate fortified library calls. + +; Check that we ignore two things: +; - attribute nobuiltin +; - TLI::has (always returns false thanks to -disable-simplify-libcalls) + +; CHECK-NOT: _chk +; CHECK: call void @llvm.memset.p0i8.i64(i8* %dst, i8 0, i64 %len, i32 1, i1 false) +define void @test_nobuiltin(i8* %dst, i64 %len) { + call i8* @__memset_chk(i8* %dst, i32 0, i64 %len, i64 -1) nobuiltin + ret void +} + +declare i8* @__memset_chk(i8*, i32, i64, i64) |
