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authorGravatar Abseil Team <absl-team@google.com>2018-03-06 12:30:19 -0800
committerGravatar Shaindel Schwartz <shaindel@google.com>2018-03-06 17:21:05 -0500
commit94f0f79ecd2d9e5271a21bc4ededea9b58c60674 (patch)
tree7e1fd953b35cd6961e0d5717e5f465d1931fd1d4 /absl/base/config.h
parent5337d2d0e312ce6bce0140b5f1da5548a0b3fed5 (diff)
Changes imported from Abseil "staging" branch:
- aba727a5943a014392e3873349cee9dd5efc634e Avoid using 128-bit intrinsics for Clang on Windows. by Abseil Team <absl-team@google.com> - cdd19f1eda562af8906bff8feff827eb8e8e9797 Utilize the rtems TID infrastructure on myriad2 platforms. by Abseil Team <absl-team@google.com> - 52f7f55daa84ea25fa210d1b9d2bd64d128e1d81 Use intrinsic 128 bit integer when available for division... by Alex Strelnikov <strel@google.com> - 51f881b1152c0c861cf7fcac53f30d3c7ce12902 Merge GitHub #95: Fix compiler version check for clang-cl... by Derek Mauro <dmauro@google.com> GitOrigin-RevId: aba727a5943a014392e3873349cee9dd5efc634e Change-Id: I9b52d84095537acbbc96d3f74917f78da9a51156
Diffstat (limited to 'absl/base/config.h')
-rw-r--r--absl/base/config.h20
1 files changed, 13 insertions, 7 deletions
diff --git a/absl/base/config.h b/absl/base/config.h
index 6703d0ea..a387041d 100644
--- a/absl/base/config.h
+++ b/absl/base/config.h
@@ -176,16 +176,22 @@
// Checks whether the __int128 compiler extension for a 128-bit integral type is
// supported.
//
-// Notes: __SIZEOF_INT128__ is defined by Clang and GCC when __int128 is
-// supported, except on ppc64 and aarch64 where __int128 exists but has exhibits
-// a sporadic compiler crashing bug. Nvidia's nvcc also defines __GNUC__ and
-// __SIZEOF_INT128__ but not all versions actually support __int128.
+// Note: __SIZEOF_INT128__ is defined by Clang and GCC when __int128 is
+// supported, but we avoid using it in certain cases:
+// * On Clang:
+// * Building using Clang for Windows, where the Clang runtime library has
+// 128-bit support only on LP64 architectures, but Windows is LLP64.
+// * Building for aarch64, where __int128 exists but has exhibits a sporadic
+// compiler crashing bug.
+// * On Nvidia's nvcc:
+// * nvcc also defines __GNUC__ and __SIZEOF_INT128__, but not all versions
+// actually support __int128.
#ifdef ABSL_HAVE_INTRINSIC_INT128
#error ABSL_HAVE_INTRINSIC_INT128 cannot be directly set
#elif defined(__SIZEOF_INT128__)
-#if (defined(__clang__) && !defined(__aarch64__)) || \
- (defined(__CUDACC__) && __CUDACC_VER_MAJOR__ >= 9) || \
- (!defined(__clang__) && !defined(__CUDACC__) && defined(__GNUC__))
+#if (defined(__clang__) && !defined(_WIN32) && !defined(__aarch64__)) || \
+ (defined(__CUDACC__) && __CUDACC_VER_MAJOR__ >= 9) || \
+ (defined(__GNUC__) && !defined(__clang__) && !defined(__CUDACC__))
#define ABSL_HAVE_INTRINSIC_INT128 1
#elif defined(__CUDACC__)
// __CUDACC_VER__ is a full version number before CUDA 9, and is defined to a