Add Uses=[SP] to call instructions. This fixes a miscompilation with a

variable sized alloca.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138433 91177308-0d34-0410-b5e6-96231b3b80d8

test/CodeGen/XCore/2011-08-01-DynamicAllocBug.ll

@@ -0,0 +1,20 @@
+; RUN: llc < %s -march=xcore | FileCheck %s
+
+declare void @g()
+declare i8* @llvm.stacksave() nounwind
+declare void @llvm.stackrestore(i8*) nounwind
+
+define void @f(i32** %p, i32 %size) {
+allocas:
+  %0 = call i8* @llvm.stacksave()
+  %a = alloca i32, i32 %size
+  store i32* %a, i32** %p
+  call void @g()
+  call void @llvm.stackrestore(i8* %0)
+  ret void
+}
+; CHECK: f:
+; CHECK: ldaw [[REGISTER:r[0-9]+]], {{r[0-9]+}}[-r1]
+; CHECK: set sp, [[REGISTER]]
+; CHECK extsp 1
+; CHECK bl g