Changes imported from Abseil "staging" branch:
- 3f758237a43af1f277990492701d26d1153b4d74 Generalize the construction/destruction tests, to prepare... by Greg Falcon <gfalcon@google.com> - 7bea88f74fbac34b0c0b00b8b832a544988b9465 Simplify non intrinsic uint128 multiply. by Alex Strelnikov <strel@google.com> GitOrigin-RevId: 3f758237a43af1f277990492701d26d1153b4d74 Change-Id: Idd9a2df0b90403f10f56bb66d30b76a8ba9f50e7
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2 changed files with 11 additions and 26 deletions
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@ -570,25 +570,14 @@ inline uint128& uint128::operator*=(uint128 other) {
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static_cast<unsigned __int128>(other);
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return *this;
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#else // ABSL_HAVE_INTRINSIC128
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uint64_t a96 = hi_ >> 32;
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uint64_t a64 = hi_ & 0xffffffff;
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uint64_t a32 = lo_ >> 32;
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uint64_t a00 = lo_ & 0xffffffff;
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uint64_t b96 = other.hi_ >> 32;
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uint64_t b64 = other.hi_ & 0xffffffff;
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uint64_t b32 = other.lo_ >> 32;
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uint64_t b00 = other.lo_ & 0xffffffff;
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// multiply [a96 .. a00] x [b96 .. b00]
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// terms higher than c96 disappear off the high side
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// terms c96 and c64 are safe to ignore carry bit
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uint64_t c96 = a96 * b00 + a64 * b32 + a32 * b64 + a00 * b96;
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uint64_t c64 = a64 * b00 + a32 * b32 + a00 * b64;
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this->hi_ = (c96 << 32) + c64;
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this->lo_ = 0;
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// add terms after this one at a time to capture carry
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hi_ = hi_ * other.lo_ + lo_ * other.hi_ + a32 * b32;
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lo_ = a00 * b00;
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*this += uint128(a32 * b00) << 32;
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*this += uint128(a00 * b32) << 32;
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*this += a00 * b00;
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return *this;
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#endif // ABSL_HAVE_INTRINSIC128
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}
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@ -18,6 +18,7 @@
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#include "absl/base/attributes.h"
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#include "absl/base/internal/raw_logging.h"
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#include "absl/base/thread_annotations.h"
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#include "absl/synchronization/mutex.h"
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#include "absl/synchronization/notification.h"
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@ -106,24 +107,19 @@ void TestLocals() {
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// definitions. We can use this to arrange for tests to be run on these objects
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// before they are created, and after they are destroyed.
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class ConstructorTestRunner {
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using Function = void (*)();
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class OnConstruction {
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public:
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ConstructorTestRunner(absl::Mutex* mutex, absl::CondVar* condvar,
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absl::Notification* notification) {
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RunTests(mutex, condvar, notification);
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}
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explicit OnConstruction(Function fn) { fn(); }
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};
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class DestructorTestRunner {
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class OnDestruction {
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public:
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DestructorTestRunner(absl::Mutex* mutex, absl::CondVar* condvar,
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absl::Notification* notification)
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: mutex_(mutex), condvar_(condvar), notification_(notification) {}
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~DestructorTestRunner() { RunTests(mutex_, condvar_, notification_); }
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explicit OnDestruction(Function fn) : fn_(fn) {}
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~OnDestruction() { fn_(); }
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private:
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absl::Mutex* mutex_;
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absl::CondVar* condvar_;
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absl::Notification* notification_;
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Function fn_;
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};
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} // namespace
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