Teach DataLayout that pointer ABI and preferred alignments are required to be powers of two.

Previously this resulted in asserts and/or crashes (depending on build configuration) at various phases in the optimizer.

llvm-svn: 230938

1 files changed, 6 insertions, 0 deletions

diff --git a/llvm/lib/IR/DataLayout.cpp b/llvm/lib/IR/DataLayout.cpp
index c414e80..4eb6d78 100644
--- a/llvm/lib/IR/DataLayout.cpp
+++ b/llvm/lib/IR/DataLayout.cpp
@@ -268,12 +268,18 @@ void DataLayout::parseSpecifier(StringRef Desc) {
             "Missing alignment specification for pointer in datalayout string");
       Split = split(Rest, ':');
       unsigned PointerABIAlign = inBytes(getInt(Tok));
+      if (!isPowerOf2_64(PointerABIAlign))
+        report_fatal_error(
+            "Pointer ABI alignment must be a power of 2");
 
       // Preferred alignment.
       unsigned PointerPrefAlign = PointerABIAlign;
       if (!Rest.empty()) {
         Split = split(Rest, ':');
         PointerPrefAlign = inBytes(getInt(Tok));
+        if (!isPowerOf2_64(PointerPrefAlign))
+          report_fatal_error(
+            "Pointer preferred alignment must be a power of 2");
       }
 
       setPointerAlignment(AddrSpace, PointerABIAlign, PointerPrefAlign,