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-rw-r--r--libguile/whippet/src/gc-align.h22
1 files changed, 22 insertions, 0 deletions
diff --git a/libguile/whippet/src/gc-align.h b/libguile/whippet/src/gc-align.h
new file mode 100644
index 000000000..c0758b1e0
--- /dev/null
+++ b/libguile/whippet/src/gc-align.h
@@ -0,0 +1,22 @@
+#ifndef GC_ALIGN_H
+#define GC_ALIGN_H
+
+#ifndef GC_IMPL
+#error internal header file, not part of API
+#endif
+
+#include <stdint.h>
+
+static inline uintptr_t align_down(uintptr_t addr, size_t align) {
+ return addr & ~(align - 1);
+}
+static inline uintptr_t align_up(uintptr_t addr, size_t align) {
+ return align_down(addr + align - 1, align);
+}
+
+// Poor man's equivalent of std::hardware_destructive_interference_size.
+#define AVOID_FALSE_SHARING 128
+#define ALIGNED_TO_AVOID_FALSE_SHARING \
+ __attribute__((aligned(AVOID_FALSE_SHARING)))
+
+#endif // GC_ALIGN_H