Index: lib/Target/PowerPC/PPCISelLowering.cpp
===================================================================
--- lib/Target/PowerPC/PPCISelLowering.cpp
+++ lib/Target/PowerPC/PPCISelLowering.cpp
@@ -3505,9 +3505,14 @@
       // Argument stored in memory.
       assert(VA.isMemLoc());
 
+      // Get the extended size of the argument type in stack
       unsigned ArgSize = VA.getLocVT().getStoreSize();
-      int FI = MFI.CreateFixedObject(ArgSize, VA.getLocMemOffset(),
-                                     isImmutable);
+      // Get the actual size of the argument type
+      unsigned ObjSize = VA.getValVT().getStoreSize();
+      unsigned ArgOffset = VA.getLocMemOffset();
+      // Stack objects in PPC32 are right justified.
+      ArgOffset += ArgSize - ObjSize;
+      int FI = MFI.CreateFixedObject(ArgSize, ArgOffset, isImmutable);
 
       // Create load nodes to retrieve arguments from the stack.
       SDValue FIN = DAG.getFrameIndex(FI, PtrVT);
@@ -5462,10 +5467,11 @@
       Arg = PtrOff;
     }
 
-    if (VA.isRegLoc()) {
-      if (Arg.getValueType() == MVT::i1)
-        Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, MVT::i32, Arg);
+    // Ensure callee will get either 0x00000001 or 0x00000000.
+    if (Arg.getValueType() == MVT::i1)
+      Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, MVT::i32, Arg);
 
+    if (VA.isRegLoc()) {
       seenFloatArg |= VA.getLocVT().isFloatingPoint();
       // Put argument in a physical register.
       RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg));
Index: test/CodeGen/PowerPC/ppc32-i1-stack-arguments-abi-bug.ll
===================================================================
--- /dev/null
+++ test/CodeGen/PowerPC/ppc32-i1-stack-arguments-abi-bug.ll
@@ -0,0 +1,24 @@
+; RUN: llc -verify-machineinstrs < %s -mcpu=ppc32 -mattr=+crbits | FileCheck %s
+target triple = "powerpc-unknown-linux-gnu"
+
+define zeroext i1 @check_callee(
+  i1 zeroext, i1 zeroext, i1 zeroext, i1 zeroext,
+  i1 zeroext, i1 zeroext, i1 zeroext, i1 zeroext,
+  i1 zeroext %s1
+) {
+  call void @check_caller(
+    i1 zeroext true, i1 zeroext true, i1 zeroext true, i1 zeroext true,
+    i1 zeroext true, i1 zeroext true, i1 zeroext true, i1 zeroext true,
+    i1 zeroext %s1)
+  ret i1 true
+}
+
+; CHECK-LABEL: @check_callee
+; CHECK: lbz {{[0-9]+}}, 27(1)
+; CHECK: stw {{[0-9]+}}, 8(1)
+
+declare void @check_caller(
+  i1 zeroext, i1 zeroext, i1 zeroext, i1 zeroext,
+  i1 zeroext, i1 zeroext, i1 zeroext, i1 zeroext,
+  i1 zeroext
+)