Inspired by the linux kernel, the more we keep adds in the pointer realm, the better...

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30495 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/InstCombine/cast_ptr.ll b/test/Transforms/InstCombine/cast_ptr.ll
new file mode 100644 (file)
index 0000000..be0a897
--- /dev/null
+++ b/test/Transforms/InstCombine/cast_ptr.ll
@@ -0,0 +1,15 @@
+; Tests to make sure elimination of casts is working correctly
+; RUN: llvm-as < %s | opt -instcombine -disable-output &&
+; RUN: llvm-as < %s | opt -instcombine | llvm-dis | not grep cast
+
+target pointersize = 32
+
+implementation
+
+sbyte* %test1(sbyte* %t) {
+       %tmpc = cast sbyte* %t to uint
+       %tmpa = add uint %tmpc, 32
+       %tv = cast uint %tmpa to sbyte*
+       ret sbyte* %tv
+}
+