22 lines · cpp
1// RUN: %clang_cc1 -triple x86_64-unknown-unknown %s -O3 -emit-llvm -debug-info-kind=line-tables-only -verify -o /dev/null2// REQUIRES: x86-registered-target3 4// Test verifies optimization failures generated by the backend are handled5// correctly by clang. LLVM tests verify all of the failure conditions.6 7void test_switch(int *A, int *B, int Length,int J) {8#pragma clang loop vectorize(enable) unroll(disable)9 for (int i = 0; i < Length; i++) {10/* expected-warning@-1 {{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}} */ 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