21 lines
610 B
Diff
21 lines
610 B
Diff
diff --git a/base/third_party/cityhash/city.cc b/base/third_party/cityhash/city.cc
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index b0d2294aabb3..2ab3db20f4fa 100644
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--- a/base/third_party/cityhash/city.cc
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+++ b/base/third_party/cityhash/city.cc
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@@ -35,7 +35,14 @@
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using std::make_pair;
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using std::pair;
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-#ifdef _MSC_VER
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+#if defined(__clang__)
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+
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+// Use builtins where possible. On Windows for instance, this may prevent a
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+// function call instead of emitting a single instruction.
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+#define bswap_32(x) __builtin_bswap32(x)
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+#define bswap_64(x) __builtin_bswap64(x)
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+
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+#elif _MSC_VER
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#include <stdlib.h>
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#define bswap_32(x) _byteswap_ulong(x)
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