TargetLibraryInfo: Disable memcpy and memset on R600

There are no implementations of these for R600.

llvm-svn: 205455

2 files changed, 64 insertions, 1 deletions

diff --git a/llvm/lib/Target/TargetLibraryInfo.cpp b/llvm/lib/Target/TargetLibraryInfo.cpp
index 7f8919772f7..6ec0b1f929c 100644
--- a/llvm/lib/Target/TargetLibraryInfo.cpp
+++ b/llvm/lib/Target/TargetLibraryInfo.cpp
@@ -378,7 +378,16 @@ static void initialize(TargetLibraryInfo &TLI, const Triple &T,
       llvm_unreachable("TargetLibraryInfo function names must be sorted");
   }
 #endif // !NDEBUG
-  
+
+  // There are no library implementations of mempcy and memset for r600 and
+  // these can be difficult to lower in the backend.
+  if (T.getArch() == Triple::r600) {
+    TLI.setUnavailable(LibFunc::memcpy);
+    TLI.setUnavailable(LibFunc::memset);
+    TLI.setUnavailable(LibFunc::memset_pattern16);
+    return;
+  }
+
   // memset_pattern16 is only available on iOS 3.0 and Mac OS X 10.5 and later.
   if (T.isMacOSX()) {
     if (T.isMacOSXVersionLT(10, 5))
diff --git a/llvm/test/CodeGen/R600/loop-idiom.ll b/llvm/test/CodeGen/R600/loop-idiom.ll
new file mode 100644
index 00000000000..8a9cba2796c
--- /dev/null
+++ b/llvm/test/CodeGen/R600/loop-idiom.ll
@@ -0,0 +1,54 @@
+; RUN: opt -basicaa -loop-idiom -S < %s -march=r600 -mcpu=redwood | FileCheck --check-prefix=R600 --check-prefix=FUNC %s
+; RUN: opt -basicaa -loop-idiom -S < %s -march=r600 -mcpu=SI | FileCheck --check-prefix=SI --check-prefix=FUNC %s
+
+target datalayout = "e-p:32:32-p1:64:64-p2:64:64-p3:32:32-p4:32:32-p5:64:64-i64:64-v16:16-v24:32-v32:32-v48:64-v96:128-v192:256-v256:256-v512:512-v1024:1024-v2048:2048-n32:64"
+target triple = "r600--"
+
+
+
+; Make sure loop-idiom doesn't create memcpy or memset.  There are no library
+; implementations of these for R600.
+
+; FUNC: @no_memcpy
+; R600-NOT: @llvm.memcpy
+; SI-NOT: @llvm.memcpy
+define void @no_memcpy(i8 addrspace(3)* %in, i32 %size) {
+entry:
+  %dest = alloca i8, i32 32
+  br label %for.body
+
+for.body:
+  %0 = phi i32 [0, %entry], [%4, %for.body]
+  %1 = getelementptr i8 addrspace(3)* %in, i32 %0
+  %2 = getelementptr i8* %dest, i32 %0
+  %3 = load i8 addrspace(3)* %1
+  store i8 %3, i8* %2
+  %4 = add i32 %0, 1
+  %5 = icmp eq i32 %4, %size
+  br i1 %5, label %for.end, label %for.body
+
+for.end:
+  ret void
+}
+
+; FUNC: @no_memset
+; R600-NOT: @llvm.memset
+; R600-NOT: @memset_pattern16
+; SI-NOT: @llvm.memset
+; SI-NOT: @memset_pattern16
+define void @no_memset(i32 %size) {
+entry:
+  %dest = alloca i8, i32 32
+  br label %for.body
+
+for.body:
+  %0 = phi i32 [0, %entry], [%2, %for.body]
+  %1 = getelementptr i8* %dest, i32 %0
+  store i8 0, i8* %1
+  %2 = add i32 %0, 1
+  %3 = icmp eq i32 %2, %size
+  br i1 %3, label %for.end, label %for.body
+
+for.end:
+  ret void
+}