clang/test/CodeGen/2008-07-31-promotion-of-compound-pointer-arithmetic.c

   1 // RUN: %clang_cc1 -triple i386-unknown-unknown -O1 -Wno-int-conversion -emit-llvm -o - %s | FileCheck %s
   2 // CHECK-LABEL: define{{.*}} i32 @f0
   3 // CHECK:   ret i32 1
   4 // CHECK-LABEL: define{{.*}} i32 @f1
   5 // CHECK:   ret i32 1
   6 // CHECK-LABEL: define{{.*}} i32 @f2
   7 // CHECK:   ret i32 1
   8 // <rdr://6115726>
   9
  10 int f0(void) {
  11   int x;
  12   unsigned short n = 1;
  13   int *a = &x;
  14   int *b = &x;
  15   a = a - n;
  16   b -= n;
  17   return a == b;
  18 }
  19
  20 int f1(int *a) {
  21   long b = a - (int*) 1;
  22   a -= (int*) 1;
  23   return b == (long) a;
  24 }
  25
  26 int f2(long n) {
  27   int *b = n + (int*) 1;
  28   n += (int*) 1;
  29   return b == (int*) n;
  30 }
  31