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-rw-r--r--llvm/lib/Target/PowerPC/README_ALTIVEC.txt8
1 files changed, 8 insertions, 0 deletions
diff --git a/llvm/lib/Target/PowerPC/README_ALTIVEC.txt b/llvm/lib/Target/PowerPC/README_ALTIVEC.txt
index 9611f9e318d..143804da07f 100644
--- a/llvm/lib/Target/PowerPC/README_ALTIVEC.txt
+++ b/llvm/lib/Target/PowerPC/README_ALTIVEC.txt
@@ -169,3 +169,11 @@ LBB1_2: ; entry
blr
//===----------------------------------------------------------------------===//
+
+CodeGen/PowerPC/vec_constants.ll has an and operation that should be
+codegen'd to andc. The issue is that the 'all ones' build vector is
+SelectNodeTo'd a VSPLTISB instruction node before the and/xor is selected
+which prevents the vnot pattern from matching.
+
+
+//===----------------------------------------------------------------------===//
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