Make more use of benchmark::DoNotOptimize in benchmarks.
A lot of these benchmarks predate DoNotOptimize and rolled their own
hacks.
Bug: http://b/148307629
Test: ran benchmarks before & after and got similar results
Change-Id: If44699d261b687f6253af709edda58f4c90fb285
diff --git a/benchmarks/stdio_benchmark.cpp b/benchmarks/stdio_benchmark.cpp
index 037bbd9..03f3f29 100644
--- a/benchmarks/stdio_benchmark.cpp
+++ b/benchmarks/stdio_benchmark.cpp
@@ -155,9 +155,8 @@
while (state.KeepRunning()) {
FILE* fp = fopen("/dev/zero", "re");
if (no_locking) __fsetlocking(fp, FSETLOCKING_BYCALLER);
- volatile int c __attribute__((unused));
for (size_t i = 0; i < nbytes; ++i) {
- c = fgetc(fp);
+ benchmark::DoNotOptimize(fgetc(fp));
}
fclose(fp);
}