File: backend-optimization-failure.cpp

package info (click to toggle)
llvm-toolchain-snapshot 1%3A21~%2B%2B20250612091244%2B3f0cf742ac4e-1~exp1
  • links: PTS, VCS
  • area: main
  • in suites: experimental
  • size: 2,204,364 kB
  • sloc: cpp: 7,565,811; ansic: 1,415,365; asm: 1,031,257; python: 250,248; f90: 93,670; objc: 70,556; lisp: 41,926; pascal: 17,847; sh: 10,009; ml: 5,111; perl: 4,720; awk: 3,523; makefile: 3,423; javascript: 2,272; xml: 892; fortran: 763
file content (21 lines) | stat: -rw-r--r-- 807 bytes parent folder | download | duplicates (8) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
 
// 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;
    }
  }
}