Export of internal Abseil changes

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dab5caab05d89d03066ef92584660688595a3aaf by Mark Barolak <mbar@google.com>:

Add absl::Status and absl::StatusOr to absl/README.md

Import of https://github.com/abseil/abseil-cpp/pull/863

PiperOrigin-RevId: 347857368

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1ca3c7a96417cd6e6d62f4dc36fd5ddaa61cfa20 by Chris Kennelly <ckennelly@google.com>:

Leverage integer power-of-2 functions and bit counting library in Abseil.

PiperOrigin-RevId: 347816486

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e5cbe05879fd65dce7875e2e0105331a1615d89b by Chris Kennelly <ckennelly@google.com>:

Mitigate narrowing warning on MSVC.

If sizeof(x) <= sizeof(uint32_t), no truncation occurs when casting to
uint32_t, but the compiler cannot always determine this.

PiperOrigin-RevId: 347696526

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079dff64cb175d282d9e22dfb4a522199ffdae2e by Benjamin Barenblat <bbaren@google.com>:

Avoid libgcc -NaN narrowing bug

When testing -NaN parsing, avoid narrowing -NaN from double to float.
This avoids a bug in libgcc
(https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98251).

PiperOrigin-RevId: 347654751

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2e78a7634865aeef6765e1f447e96cf8d9985059 by Chris Kennelly <ckennelly@google.com>:

Mark popcount helpers as inline.

These are conditionally constexpr, so we need to add inline to cover the
non-constexpr builds to avoid ODR violations.

PiperOrigin-RevId: 347620138

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437fbb363aea1654179f102dcdd607ec33c1af1e by Chris Kennelly <ckennelly@google.com>:

Use explicit narrowing cast.

This is never invoked in practice, but compilers with -Wimplicit-int-conversion
may trigger when sizeof(T) > sizeof(uint16_t) prior to determining this never
runs.

PiperOrigin-RevId: 347609857
GitOrigin-RevId: dab5caab05d89d03066ef92584660688595a3aaf
Change-Id: I6296ddffe7ec646f8ce121138f21e1e85a2cff4b

1 files changed, 4 insertions, 3 deletions

diff --git a/absl/random/internal/pcg_engine.h b/absl/random/internal/pcg_engine.h
index 53c23fe1..8efaf2e0 100644
--- a/absl/random/internal/pcg_engine.h
+++ b/absl/random/internal/pcg_engine.h
@@ -19,6 +19,7 @@
 
 #include "absl/base/config.h"
 #include "absl/meta/type_traits.h"
+#include "absl/numeric/bits.h"
 #include "absl/numeric/int128.h"
 #include "absl/random/internal/fastmath.h"
 #include "absl/random/internal/iostream_state_saver.h"
@@ -261,7 +262,7 @@ struct pcg_xsl_rr_128_64 {
     uint64_t rotate = h >> 58u;
     uint64_t s = Uint128Low64(state) ^ h;
 #endif
-    return random_internal::rotr(s, rotate);
+    return rotr(s, rotate);
   }
 };
 
@@ -281,8 +282,8 @@ struct pcg_xsh_rr_64_32 {
   using state_type = uint64_t;
   using result_type = uint32_t;
   inline uint32_t operator()(uint64_t state) {
-    return random_internal::rotr(
-        static_cast<uint32_t>(((state >> 18) ^ state) >> 27), state >> 59);
+    return rotr(static_cast<uint32_t>(((state >> 18) ^ state) >> 27),
+                state >> 59);
   }
 };