1 files changed, 2 insertions, 2 deletions
diff --git a/lib/CodeGen/GlobalISel/CallLowering.cpp b/lib/CodeGen/GlobalISel/CallLowering.cpp
index 035a2ac78ed99..ebfe6cb3b733f 100644
--- a/lib/CodeGen/GlobalISel/CallLowering.cpp
+++ b/lib/CodeGen/GlobalISel/CallLowering.cpp
@@ -83,8 +83,8 @@ void CallLowering::setArgFlags(CallLowering::ArgInfo &Arg, unsigned OpIdx,
     // For ByVal, alignment should be passed from FE.  BE will guess if
     // this info is not there but there are cases it cannot get right.
     unsigned FrameAlign;
-    if (FuncInfo.getParamAlignment(OpIdx))
-      FrameAlign = FuncInfo.getParamAlignment(OpIdx);
+    if (FuncInfo.getParamAlignment(OpIdx - 1))
+      FrameAlign = FuncInfo.getParamAlignment(OpIdx - 1);
     else
       FrameAlign = getTLI()->getByValTypeAlignment(ElementTy, DL);
     Arg.Flags.setByValAlign(FrameAlign);