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benchtests: Mark output variables as used

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Prevent function calls that don't return anything from being optimized
out by the compiler by marking its input variables as used.

This prevents the sincos function call from being optimized out in the
benchmark.
This commit is contained in:
Siddhesh Poyarekar 2015-11-17 16:01:15 +05:30
parent b43e85786f
commit 4916acd87b
2 changed files with 6 additions and 1 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2015-11-17 Siddhesh Poyarekar <siddhesh.poyarekar@linaro.org>
* benchtests/scripts/bench.py (_print_arg_data): Mark output variables
as used.
2015-11-16 Florian Weimer <fweimer@redhat.com>
* math/test-signgam-finite-c99.c (_Mlong_double_): Undefine.

2
benchtests/scripts/bench.py
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@ -164,7 +164,7 @@ def _print_arg_data(func, directives, all_vals):
if pos == -1:
die('Output argument must be a pointer type')
outargs.append('static %s out%d;' % (arg[1:pos], i))
outargs.append('static %s out%d __attribute__((used));' % (arg[1:pos], i))
func_args.append(' &out%d' % i)
else:
arg_struct.append(' %s volatile arg%d;' % (arg, i))