1 files changed, 81 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/getelementptr.ll b/test/Transforms/InstCombine/getelementptr.ll
new file mode 100644
index 0000000000000..c2cb720803194
--- /dev/null
+++ b/test/Transforms/InstCombine/getelementptr.ll
@@ -0,0 +1,81 @@
+; The %A getelementptr instruction should be eliminated here
+
+; RUN: llvm-as < %s | opt -instcombine | llvm-dis | \
+; RUN:    grep -v %B | not grep getelementptr
+; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep foo1
+; END.
+
+@Global = constant [10 x i8] c"helloworld"              ; <[10 x i8]*> [#uses=1]
+
+; Test noop elimination
+define i32* @foo1(i32* %I) {
+        %A = getelementptr i32* %I, i64 0               ; <i32*> [#uses=1]
+        ret i32* %A
+}
+
+; Test noop elimination
+define i32* @foo2(i32* %I) {
+        %A = getelementptr i32* %I              ; <i32*> [#uses=1]
+        ret i32* %A
+}
+
+; Test that two array indexing geps fold
+define i32* @foo3(i32* %I) {
+        %A = getelementptr i32* %I, i64 17              ; <i32*> [#uses=1]
+        %B = getelementptr i32* %A, i64 4               ; <i32*> [#uses=1]
+        ret i32* %B
+}
+
+; Test that two getelementptr insts fold
+define i32* @foo4({ i32 }* %I) {
+        %A = getelementptr { i32 }* %I, i64 1           ; <{ i32 }*> [#uses=1]
+        %B = getelementptr { i32 }* %A, i64 0, i32 0            ; <i32*> [#uses=1]
+        ret i32* %B
+}
+
+define void @foo5(i8 %B) {
+        ; This should be turned into a constexpr instead of being an instruction
+        %A = getelementptr [10 x i8]* @Global, i64 0, i64 4             ; <i8*> [#uses=1]
+        store i8 %B, i8* %A
+        ret void
+}
+
+define i32* @foo6() {
+        %M = malloc [4 x i32]           ; <[4 x i32]*> [#uses=1]
+        %A = getelementptr [4 x i32]* %M, i64 0, i64 0          ; <i32*> [#uses=1]
+        %B = getelementptr i32* %A, i64 2               ; <i32*> [#uses=1]
+        ret i32* %B
+}
+
+define i32* @foo7(i32* %I, i64 %C, i64 %D) {
+        %A = getelementptr i32* %I, i64 %C              ; <i32*> [#uses=1]
+        %B = getelementptr i32* %A, i64 %D              ; <i32*> [#uses=1]
+        ret i32* %B
+}
+
+define i8* @foo8([10 x i32]* %X) {
+        ;; Fold into the cast.
+        %A = getelementptr [10 x i32]* %X, i64 0, i64 0         ; <i32*> [#uses=1]
+        %B = bitcast i32* %A to i8*             ; <i8*> [#uses=1]
+        ret i8* %B
+}
+
+define i32 @test9() {
+        %A = getelementptr { i32, double }* null, i32 0, i32 1          ; <double*> [#uses=1]
+        %B = ptrtoint double* %A to i32         ; <i32> [#uses=1]
+        ret i32 %B
+}
+
+define i1 @test10({ i32, i32 }* %x, { i32, i32 }* %y) {
+        %tmp.1 = getelementptr { i32, i32 }* %x, i32 0, i32 1           ; <i32*> [#uses=1]
+        %tmp.3 = getelementptr { i32, i32 }* %y, i32 0, i32 1           ; <i32*> [#uses=1]
+        ;; seteq x, y
+        %tmp.4 = icmp eq i32* %tmp.1, %tmp.3            ; <i1> [#uses=1]
+        ret i1 %tmp.4
+}
+
+define i1 @test11({ i32, i32 }* %X) {
+        %P = getelementptr { i32, i32 }* %X, i32 0, i32 0               ; <i32*> [#uses=1]
+        %Q = icmp eq i32* %P, null              ; <i1> [#uses=1]
+        ret i1 %Q
+}