Add a note about lowering llvm.memset, llvm.memcpy, and llvm.memmove to a
few stores under certain conditions.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25777 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/README.txt b/lib/Target/X86/README.txt
index 2308761..ac8f3f1 100644
--- a/lib/Target/X86/README.txt
+++ b/lib/Target/X86/README.txt
@@ -168,6 +168,13 @@
//===---------------------------------------------------------------------===//
+For all targets, not just X86:
+When llvm.memcpy, llvm.memset, or llvm.memmove are lowered, they should be
+optimized to a few store instructions if the source is constant and the length
+is smallish (< 8). This will greatly help some tests like Shootout/strcat.c
+
+//===---------------------------------------------------------------------===//
+
Solve this DAG isel folding deficiency:
int X, Y;