diff options
| author |  Abseil Team <absl-team@google.com> | 2022-02-23 14:30:26 -0800 |
|---|---|---|
| committer |  rogeeff <rogeeff@google.com> | 2022-02-24 12:28:55 -0500 |
| commit | 5e4ea1ce097f3571e7d87af33b6b30d11b3a211e (patch) | |
| tree | 62fbf34f7e310a9ef6602acee8fa7d61ae32df09 /absl/base/optimization.h | |
| parent | 0ad7994f10624cd1538b1287e56cae5ac9c0cb40 (diff) | |
Export of internal Abseil changes
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7473df9e4922c589f6b27cf546aad097381ae552 by Martijn Vels <mvels@google.com>:
Make ABSL_ASSUME publicly available
PiperOrigin-RevId: 430540224
Change-Id: I760e2d86e3a0b676cd2a6d26e0225a77381e948f
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c83e38bc421f715b3c1e20150c2f1ffe8e633028 by Abseil Team <absl-team@google.com>:
Alias absl::bind_front to std::bind_front if available
This avoids ambiguity between the two when enabling C++20.
PiperOrigin-RevId: 430486679
GitOrigin-RevId: 7473df9e4922c589f6b27cf546aad097381ae552
Change-Id: I1e9bba09a8946480ce10ddd28e86b6c86191d38c
Diffstat (limited to 'absl/base/optimization.h')
| -rw-r--r-- | absl/base/optimization.h | 35 |
1 files changed, 19 insertions, 16 deletions
diff --git a/absl/base/optimization.h b/absl/base/optimization.h index d090be12..6fe03c43 100644 --- a/absl/base/optimization.h +++ b/absl/base/optimization.h @@ -181,22 +181,7 @@ #define ABSL_PREDICT_TRUE(x) (x) #endif -// ABSL_INTERNAL_ASSUME(cond) -// Informs the compiler that a condition is always true and that it can assume -// it to be true for optimization purposes. The call has undefined behavior if -// the condition is false. -// In !NDEBUG mode, the condition is checked with an assert(). -// NOTE: The expression must not have side effects, as it will only be evaluated -// in some compilation modes and not others. -// -// Example: -// -// int x = ...; -// ABSL_INTERNAL_ASSUME(x >= 0); -// // The compiler can optimize the division to a simple right shift using the -// // assumption specified above. -// int y = x / 16; -// +// Platform and compilation mode dependent implementation of ABSL_ASSUME. #if !defined(NDEBUG) #define ABSL_INTERNAL_ASSUME(cond) assert(cond) #elif ABSL_HAVE_BUILTIN(__builtin_assume) @@ -215,6 +200,24 @@ } while (0) #endif +// ABSL_ASSUME(cond) +// Informs the compiler that a condition is always true and that it can assume +// it to be true for optimization purposes. The call has undefined behavior if +// the condition is false. +// In !NDEBUG mode, the condition is checked with an assert(). +// NOTE: The expression must not have side effects, as it may only be evaluated +// in some compilation modes and not others. +// +// Example: +// +// int x = ...; +// ABSL_ASSUME(x >= 0); +// // The compiler can optimize the division to a simple right shift using the +// // assumption specified above. +// int y = x / 16; +// +#define ABSL_ASSUME(cond) ABSL_INTERNAL_ASSUME(cond) + // ABSL_INTERNAL_UNIQUE_SMALL_NAME(cond) // This macro forces small unique name on a static file level symbols like // static local variables or static functions. This is intended to be used in |