1 // RUN: %clang_cc1 -triple x86_64-unknown-unknown %s -O3 -emit-llvm -S -verify -o /dev/null
2 // REQUIRES: x86-registered-target
3 
4 // Test verifies optimization failures generated by the backend are handled
5 // correctly by clang. LLVM tests verify all of the failure conditions.
6 
test_switch(int * A,int * B,int Length,int J)7 void test_switch(int *A, int *B, int Length, int J) { /* expected-warning {{loop not vectorized: the optimizer was unable to perform the requested transformation; the transformation might be disabled or specified as part of an unsupported transformation ordering}} */
8 #pragma clang loop vectorize(enable) unroll(disable)
9   for (int i = 0; i < Length; i++) {
10     switch (A[i]) {
11     case 0:
12       B[i] = 1;
13       break;
14     case 1:
15       B[J] = 2;
16       break;
17     default:
18       B[i] = 3;
19     }
20   }
21 }
22