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TheRock/compiler/amd-llvm/clang/test/Misc/backend-optimization-failure.cpp
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// RUN: %clang_cc1 -triple x86_64-unknown-unknown %s -O3 -emit-llvm -debug-info-kind=line-tables-only -verify -o /dev/null
// REQUIRES: x86-registered-target
// Test verifies optimization failures generated by the backend are handled
// correctly by clang. LLVM tests verify all of the failure conditions.
void test_switch(int *A, int *B, int Length,int J) {
#pragma clang loop vectorize(enable) unroll(disable)
for (int i = 0; i < Length; i++) {
/* 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]) {
case 0:
B[i] = 1;
break;
case 1:
B[J] = 2;
break;
default:
B[i] = 3;
}
}
}