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base: Add M5_LIKELY and M5_UNLIKELY macros to compiler.hh.

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The clang/gcc implementation uses the nonstandard __builtin_expect(). In
C++20, new standard attributes can be used instead. We can't use those
yet though.

Change-Id: Idd2541a7eca0d97ac6c643abbf2910cbc343d7e5
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/34816
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
This commit is contained in:
Gabe Black
2020-09-17 20:44:47 -07:00
parent 8d88d84d95
commit 2f6a770ccf
1 changed files with 2 additions and 0 deletions
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src/base/compiler.hh
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@@ -56,6 +56,8 @@
# define M5_UNREACHABLE __builtin_unreachable()
# define M5_PUBLIC __attribute__ ((visibility ("default")))
# define M5_LOCAL __attribute__ ((visibility ("hidden")))
# define M5_LIKELY(cond) __builtin_expect(!!(cond), 1)
# define M5_UNLIKELY(cond) __builtin_expect(!!(cond), 0)
#endif
#if defined(__clang__)