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-rw-r--r--src/common/tuklib_integer.h6
-rw-r--r--src/liblzma/common/memcmplen.h10
2 files changed, 16 insertions, 0 deletions
diff --git a/src/common/tuklib_integer.h b/src/common/tuklib_integer.h
index 21256955..aee1ad0d 100644
--- a/src/common/tuklib_integer.h
+++ b/src/common/tuklib_integer.h
@@ -52,6 +52,12 @@
// and such functions.
#if defined(__INTEL_COMPILER) && (__INTEL_COMPILER >= 1500)
# include <immintrin.h>
+// Only include <intrin.h> when it is needed. GCC and Clang can both
+// use __builtin's, so we only need Windows instrincs when using MSVC.
+// GCC and Clang can set _MSC_VER on Windows, so we need to exclude these
+// cases explicitly.
+#elif defined(_MSC_VER) && !TUKLIB_GNUC_REQ(3, 4) && !defined(__clang__)
+# include <intrin.h>
#endif
diff --git a/src/liblzma/common/memcmplen.h b/src/liblzma/common/memcmplen.h
index 5372cfa8..db3fff60 100644
--- a/src/liblzma/common/memcmplen.h
+++ b/src/liblzma/common/memcmplen.h
@@ -19,6 +19,16 @@
# include <immintrin.h>
#endif
+// Only include <intrin.h> if it is needed. The header is only needed
+// on Windows when using an MSVC compatible compiler. The Intel compiler
+// can use the intrinsics without the header file.
+#if defined(TUKLIB_FAST_UNALIGNED_ACCESS) \
+ && (defined(_MSC_VER) \
+ && defined(_M_X64) \
+ && !defined(__INTEL_COMPILER))
+# include <intrin.h>
+#endif
+
/// Find out how many equal bytes the two buffers have.
///