diff --git a/test/CodeGen/X86/2008-12-02-dagcombine-1.ll b/test/CodeGen/X86/2008-12-02-dagcombine-1.ll
new file mode 100644
index 00000000000..48bb4e43832
--- /dev/null
+++ b/test/CodeGen/X86/2008-12-02-dagcombine-1.ll
@@ -0,0 +1,19 @@
+; RUN: llvm-as < %s | llc -march=x86 | grep "(%esp)" | count 2
+target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
+target triple = "i386-apple-darwin9.5"
+; a - a should be found and removed, leaving refs to only L and P
+define i8* @test(i8* %a, i8* %L, i8* %P) nounwind {
+entry:
+        %0 = ptrtoint i8* %a to i32
+        %1 = sub i32 -2, %0
+        %2 = ptrtoint i8* %P to i32
+        %3 = sub i32 0, %2
+        %4 = ptrtoint i8* %L to i32
+        %5 = add i32 %4, %3
+	%6 = add i32 %5, %1         	; <i32> [#uses=1]
+	%7 = getelementptr i8* %a, i32 %6		; <i8*> [#uses=1]
+	br label %return
+
+return:		; preds = %bb3
+	ret i8* %7
+}
diff --git a/test/CodeGen/X86/2008-12-02-dagcombine-2.ll b/test/CodeGen/X86/2008-12-02-dagcombine-2.ll
new file mode 100644
index 00000000000..ba7dfbbcecc
--- /dev/null
+++ b/test/CodeGen/X86/2008-12-02-dagcombine-2.ll
@@ -0,0 +1,17 @@
+; RUN: llvm-as < %s | llc -march=x86 | grep "(%esp)" | count 2
+target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
+target triple = "i386-apple-darwin9.5"
+; a - a should be found and removed, leaving refs to only L and P
+define i8* @test(i8* %a, i8* %L, i8* %P) nounwind {
+entry:
+        %0 = ptrtoint i8* %a to i32
+        %1 = ptrtoint i8* %P to i32
+        %2 = sub i32 %1, %0
+        %3 = ptrtoint i8* %L to i32
+	%4 = sub i32 %2, %3         	; <i32> [#uses=1]
+	%5 = getelementptr i8* %a, i32 %4		; <i8*> [#uses=1]
+	br label %return
+
+return:		; preds = %bb3
+	ret i8* %5
+}
diff --git a/test/CodeGen/X86/2008-12-02-dagcombine-3.ll b/test/CodeGen/X86/2008-12-02-dagcombine-3.ll
new file mode 100644
index 00000000000..5fb639d5fc3
--- /dev/null
+++ b/test/CodeGen/X86/2008-12-02-dagcombine-3.ll
@@ -0,0 +1,18 @@
+; RUN: llvm-as < %s | llc -march=x86 | grep add | count 2
+; RUN: llvm-as < %s | llc -march=x86 | grep sub | grep -v subsections | count 1
+target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
+target triple = "i386-apple-darwin9.5"
+; this should be rearranged to have two +s and one -
+define i32 @test(i8* %a, i8* %L, i8* %P) nounwind {
+entry:
+        %0 = ptrtoint i8* %P to i32
+        %1 = sub i32 -2, %0
+        %2 = ptrtoint i8* %L to i32
+        %3 = ptrtoint i8* %a to i32
+	%4 = sub i32 %2, %3         	; <i32> [#uses=1]
+	%5 = add i32 %1, %4		; <i32> [#uses=1]
+	br label %return
+
+return:		; preds = %bb3
+	ret i32 %5
+}