Make sure SP is always aligned on a 2 byte boundary

llvm-svn: 193320

2 files changed, 19 insertions, 2 deletions

diff --git a/llvm/lib/Target/MSP430/MSP430FrameLowering.h b/llvm/lib/Target/MSP430/MSP430FrameLowering.h
index c673f59b5ef..8370714a594 100644
--- a/llvm/lib/Target/MSP430/MSP430FrameLowering.h
+++ b/llvm/lib/Target/MSP430/MSP430FrameLowering.h
@@ -27,8 +27,8 @@ protected:
 
 public:
   explicit MSP430FrameLowering(const MSP430Subtarget &sti)
-    : TargetFrameLowering(TargetFrameLowering::StackGrowsDown, 2, -2), STI(sti) {
-  }
+    : TargetFrameLowering(TargetFrameLowering::StackGrowsDown, 2, -2, 2),
+      STI(sti) {}
 
   /// emitProlog/emitEpilog - These methods insert prolog and epilog code into
   /// the function.
diff --git a/llvm/test/CodeGen/MSP430/transient-stack-alignment.ll b/llvm/test/CodeGen/MSP430/transient-stack-alignment.ll
new file mode 100644
index 00000000000..cca83509cf4
--- /dev/null
+++ b/llvm/test/CodeGen/MSP430/transient-stack-alignment.ll
@@ -0,0 +1,17 @@
+; RUN: llc < %s | FileCheck %s
+
+target datalayout = "e-p:16:16:16-i8:8:8-i16:16:16-i32:16:32-n8:16-a0:16:16"
+target triple = "msp430---elf"
+
+define void @test() #0 {
+; CHECK-LABEL: test:
+; CHECK: sub.w #2, r1
+  %1 = alloca i8, align 1
+; CHECK-NEXT: mov.b #0, 1(r1)
+  store i8 0, i8* %1, align 1
+; CHECK-NEXT: add.w #2, r1
+; CHECK-NEXT: ret
+  ret void
+}
+
+attributes #0 = { nounwind "no-frame-pointer-elim"="false" }