// constant. This happens frequently when iterating over a global array.
if (Opc == Instruction::Sub && TD) {
GlobalValue *GV1, *GV2;
- APInt Offs1(TD->getPointerSizeInBits(), 0),
- Offs2(TD->getPointerSizeInBits(), 0);
+ unsigned PtrSize = TD->getPointerSizeInBits();
+ unsigned OpSize = TD->getTypeSizeInBits(Op0->getType());
+ APInt Offs1(PtrSize, 0), Offs2(PtrSize, 0);
if (IsConstantOffsetFromGlobal(Op0, GV1, Offs1, *TD))
if (IsConstantOffsetFromGlobal(Op1, GV2, Offs2, *TD) &&
GV1 == GV2) {
// (&GV+C1) - (&GV+C2) -> C1-C2, pointer arithmetic cannot overflow.
- return ConstantInt::get(Op0->getType(), Offs1-Offs2);
+ // PtrToInt may change the bitwidth so we have convert to the right size
+ // first.
+ return ConstantInt::get(Op0->getType(), Offs1.zextOrTrunc(OpSize) -
+ Offs2.zextOrTrunc(OpSize));
}
}
%sub = sub <4 x i32> %p1, %p2
ret <4 x i32> %sub
}
+
+%struct.ham = type { i32, [2 x [2 x i32]] }
+
+@global = internal global %struct.ham zeroinitializer, align 4
+
+define i32 @ptrdiff5() nounwind {
+bb:
+ %tmp = getelementptr inbounds %struct.ham* @global, i32 0, i32 1
+ %tmp1 = getelementptr inbounds [2 x [2 x i32]]* %tmp, i32 0, i32 0
+ %tmp2 = bitcast [2 x i32]* %tmp1 to i32*
+ %tmp3 = ptrtoint i32* %tmp2 to i32
+ %tmp4 = getelementptr inbounds %struct.ham* @global, i32 0, i32 1
+ %tmp5 = getelementptr inbounds [2 x [2 x i32]]* %tmp4, i32 0, i32 0
+ %tmp6 = ptrtoint [2 x i32]* %tmp5 to i32
+ %tmp7 = sub i32 %tmp3, %tmp6
+ ret i32 %tmp7
+; CHECK: @ptrdiff5
+; CHECK: ret i32 0
+}