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libstdc++: Add [[unlikely]] attributes to std::random_device routines

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libstdc++-v3/ChangeLog:

	* src/c++11/random.cc (__x86_rdrand, __x86_rdseed): Add
	[[unlikely]] attribute.
This commit is contained in:
Jonathan Wakely 2021-11-05 12:18:52 +00:00
parent 5997e6a6ec
commit 2627e3b7fd
1 changed files with 2 additions and 2 deletions
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4
libstdc++-v3/src/c++11/random.cc
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@ -97,7 +97,7 @@ namespace std _GLIBCXX_VISIBILITY(default)
unsigned int retries = 100;
unsigned int val;
while (__builtin_ia32_rdrand32_step(&val) == 0)
while (__builtin_ia32_rdrand32_step(&val) == 0) [[__unlikely__]]
if (--retries == 0)
std::__throw_runtime_error(__N("random_device: rdrand failed"));
@ -113,7 +113,7 @@ namespace std _GLIBCXX_VISIBILITY(default)
unsigned int retries = 100;
unsigned int val;
while (__builtin_ia32_rdseed_si_step(&val) == 0)
while (__builtin_ia32_rdseed_si_step(&val) == 0) [[__unlikely__]]
{
if (--retries == 0)
{