diff options
Diffstat (limited to 'libcxx/utils/google-benchmark/src/cycleclock.h')
| -rw-r--r-- | libcxx/utils/google-benchmark/src/cycleclock.h | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/libcxx/utils/google-benchmark/src/cycleclock.h b/libcxx/utils/google-benchmark/src/cycleclock.h index 3110804634c..e4825d4ba24 100644 --- a/libcxx/utils/google-benchmark/src/cycleclock.h +++ b/libcxx/utils/google-benchmark/src/cycleclock.h @@ -113,11 +113,11 @@ inline BENCHMARK_ALWAYS_INLINE int64_t Now() { uint32_t pmuseren; uint32_t pmcntenset; // Read the user mode perf monitor counter access permissions. - asm("mrc p15, 0, %0, c9, c14, 0" : "=r"(pmuseren)); + asm volatile("mrc p15, 0, %0, c9, c14, 0" : "=r"(pmuseren)); if (pmuseren & 1) { // Allows reading perfmon counters for user mode code. - asm("mrc p15, 0, %0, c9, c12, 1" : "=r"(pmcntenset)); + asm volatile("mrc p15, 0, %0, c9, c12, 1" : "=r"(pmcntenset)); if (pmcntenset & 0x80000000ul) { // Is it counting? - asm("mrc p15, 0, %0, c9, c13, 0" : "=r"(pmccntr)); + asm volatile("mrc p15, 0, %0, c9, c13, 0" : "=r"(pmccntr)); // The counter is set up to count every 64th cycle return static_cast<int64_t>(pmccntr) * 64; // Should optimize to << 6 } |
