InstSimplify: stripAndComputeConstantOffsets can be called with vectors of pointers too.
Prepare it for vectors of pointers and handle simple cases. We don't handle
complicated cases because accumulateConstantOffset bails on pointer vectors.
Fixes selfhost on i386.
llvm-svn: 174179
diff --git a/llvm/test/Transforms/InstSimplify/ptr_diff.ll b/llvm/test/Transforms/InstSimplify/ptr_diff.ll
index 1eb1fd4..8651628 100644
--- a/llvm/test/Transforms/InstSimplify/ptr_diff.ll
+++ b/llvm/test/Transforms/InstSimplify/ptr_diff.ll
@@ -46,3 +46,14 @@
%diff = sub i64 %last.int, %first.int
ret i64 %diff
}
+
+define <4 x i32> @ptrdiff4(<4 x i8*> %arg) nounwind {
+; Handle simple cases of vectors of pointers.
+; CHECK: @ptrdiff4
+; CHECK: ret <4 x i32> zeroinitializer
+ %p1 = ptrtoint <4 x i8*> %arg to <4 x i32>
+ %bc = bitcast <4 x i8*> %arg to <4 x i32*>
+ %p2 = ptrtoint <4 x i32*> %bc to <4 x i32>
+ %sub = sub <4 x i32> %p1, %p2
+ ret <4 x i32> %sub
+}