34 lines
955 B
Diff
34 lines
955 B
Diff
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From cb0b1c30103abc17dbbed14210bbc59a73802206 Mon Sep 17 00:00:00 2001
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From: Peter Jones <pjones@redhat.com>
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Date: Mon, 7 Jan 2019 10:30:23 -0500
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Subject: [PATCH 01/86] util.h: add unlikely() and likely() macros
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Signed-off-by: Peter Jones <pjones@redhat.com>
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---
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src/util.h | 9 +++++++++
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1 file changed, 9 insertions(+)
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diff --git a/src/util.h b/src/util.h
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index f63a8907611..ba8fee35ae9 100644
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--- a/src/util.h
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+++ b/src/util.h
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@@ -52,6 +52,15 @@
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#define PACKED __attribute__((__packed__))
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#define VERSION(sym, ver) __asm__(".symver " # sym "," # ver)
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+#define __branch_check__(x, expect, is_constant) \
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+ __builtin_expect(!!(x), expect)
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+#ifndef likely
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+#define likely(x) (__branch_check__(x, 1, __builtin_constant_p(x)))
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+#endif
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+#ifndef unlikely
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+#define unlikely(x) (__branch_check__(x, 0, __builtin_constant_p(x)))
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+#endif
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+
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/*
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* I'm not actually sure when these appear, but they're present in the
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* version in front of me.
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--
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2.24.1
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