1 files changed, 84 insertions, 0 deletions
diff --git a/llvm/test/Integer/constexpr_bt.ll b/llvm/test/Integer/constexpr_bt.ll
new file mode 100644
index 00000000000..9792e511924
--- /dev/null
+++ b/llvm/test/Integer/constexpr_bt.ll
@@ -0,0 +1,84 @@
+; RUN: llvm-as %s -o - | llvm-dis > %t1.ll
+; RUN: llvm-as %t1.ll -o - | llvm-dis > %t2.ll
+; RUN: diff %t1.ll %t2.ll
+; XFAIL: *
+
+; This testcase is for testing expressions constructed from
+; constant values, including constant pointers to globals.
+;
+
+;;-------------------------------
+;; Test constant cast expressions
+;;-------------------------------
+
+global i63 0x00001     ; hexadecimal unsigned integer constants
+global i63  0x012312   ; hexadecimal signed integer constants
+
+%t2 = global i33* %t1                             ;; Forward reference without cast
+%t3 = global i33* bitcast (i33* %t1 to i33*)       ;; Forward reference with cast
+%t1 = global i33 4                                ;; i32* %0
+%t4 = global i33** bitcast (i33** %t3 to i33**)     ;; Cast of a previous cast
+%t5 = global i33** %t3                           ;; Reference to a previous cast
+%t6 = global i33*** %t4
+%t7 = global float* inttoptr (i32 12345678 to float*) ;; Cast ordinary value to ptr
+%t9 = global i33 fp2uint (float sitofp (i33 8 to float) to i33) ;; Nested cast expression
+
+global i32* bitcast (float* %0 to i32*)   ;; Forward numeric reference
+global float* %0                       ;; Duplicate forward numeric reference
+global float 0.0
+
+
+;;---------------------------------------------------
+;; Test constant getelementpr expressions for arrays
+;;---------------------------------------------------
+
+%array  = constant [2 x i33] [ i33 12, i33 52 ]
+%arrayPtr = global i33* getelementptr ([2 x i33]* %array, i64 0, i64 0)    ;; i33* &%array[0][0]
+%arrayPtr5 = global i33** getelementptr (i33** %arrayPtr, i64 5)    ;; i33* &%arrayPtr[5]
+
+%somestr = constant [11x i8] c"hello world"
+%char5  = global i8* getelementptr([11x i8]* %somestr, i64 0, i64 5)
+
+;; cast of getelementptr
+%char8a = global i33* sext (i8* getelementptr([11x i8]* %somestr, i64 0, i64 8) to i33*)
+
+;; getelementptr containing casts
+%char8b = global i8* getelementptr([11x i8]* %somestr, i64 sext (i8 0 to i64), i64 sext (i8 8 to i64))
+
+;;-------------------------------------------------------
+;; TODO: Test constant getelementpr expressions for structures
+;;-------------------------------------------------------
+
+%SType  = type { i33 , {float, {i8} }, i64 } ;; struct containing struct
+%SAType = type { i33 , {[2x float], i64} } ;; struct containing array
+
+%S1 = global %SType* null			;; Global initialized to NULL
+%S2c = constant %SType { i33 1, {float,{i8}} {float 2.0, {i8} {i8 3}}, i64 4}
+
+%S3c = constant %SAType { i33 1, {[2x float], i64} {[2x float] [float 2.0, float 3.0], i64 4} }
+
+%S1ptr = global %SType** %S1		    ;; Ref. to global S1
+%S2  = global %SType* %S2c		    ;; Ref. to constant S2
+%S3  = global %SAType* %S3c		    ;; Ref. to constant S3
+
+					    ;; Pointer to float (**%S1).1.0
+%S1fld1a = global float* getelementptr (%SType* %S2c, i64 0, i32 1, i32 0)
+					    ;; Another ptr to the same!
+%S1fld1b = global float* getelementptr (%SType* %S2c, i64 0, i32 1, i32 0)
+
+%S1fld1bptr = global float** %S1fld1b	    ;; Ref. to previous pointer
+
+					    ;; Pointer to i8 (**%S2).1.1.0
+%S2fld3 = global i8* getelementptr (%SType* %S2c, i64 0, i32 1, i32 1, i32 0) 
+
+					    ;; Pointer to float (**%S2).1.0[0]
+;%S3fld3 = global float* getelementptr (%SAType** %S3, i64 0, i64 0, i32 1, i32 0, i64 0) 
+
+;;---------------------------------------------------------
+;; TODO: Test constant expressions for unary and binary operators
+;;---------------------------------------------------------
+
+;;---------------------------------------------------
+
+implementation
+