Taints the non-acquire RMW's store address with the load part

[oota-llvm.git] / include / llvm / Support / LEB128.h

diff --git a/include/llvm/Support/LEB128.h b/include/llvm/Support/LEB128.h
index 4dbc5e91a2cdcd9b0a161aaa755b6ba63a5534c6..6a95432ca2d93c69dd5c89e5186844d75d8f3b81 100644 (file)
--- a/include/llvm/Support/LEB128.h
+++ b/include/llvm/Support/LEB128.h
@@ -90,6 +90,26 @@ inline uint64_t decodeULEB128(const uint8_t *p, unsigned *n = nullptr) {
   return Value;
 }
 
+/// Utility function to decode a SLEB128 value.
+inline int64_t decodeSLEB128(const uint8_t *p, unsigned *n = nullptr) {
+  const uint8_t *orig_p = p;
+  int64_t Value = 0;
+  unsigned Shift = 0;
+  uint8_t Byte;
+  do {
+    Byte = *p++;
+    Value |= ((Byte & 0x7f) << Shift);
+    Shift += 7;
+  } while (Byte >= 128);
+  // Sign extend negative numbers.
+  if (Byte & 0x40)
+    Value |= (-1ULL) << Shift;
+  if (n)
+    *n = (unsigned)(p - orig_p);
+  return Value;
+}
+
+
 /// Utility function to get the size of the ULEB128-encoded value.
 extern unsigned getULEB128Size(uint64_t Value);