Initial import

libc/bits/bigword.h

@@ -0,0 +1,28 @@
+#ifndef COSMOPOLITAN_LIBC_BITS_BIGWORD_H_
+#define COSMOPOLITAN_LIBC_BITS_BIGWORD_H_
+
+#if 0
+/**
+ * Let BIGWORD be the the number of bytes in the largest cpu register
+ * available within the instruction set architecture requirements chosen
+ * at compile-time.
+ *
+ * In plainer terms, if you tune with flags like -mavx, you're not just
+ * giving the compiler permission to generate code that's incompatible
+ * with older computers; you're also asking Cosmopolitan to systemically
+ * change alignment, vectoring, buffering, ABIs, memory allocation, etc.
+ */
+#endif
+#ifndef BIGWORD
+#if __AVX512F__ + 0
+#define BIGWORD 64
+#elif __AVX2__ + 0
+#define BIGWORD 32
+#elif __SSE2__ + 0
+#define BIGWORD 16
+#else
+#define BIGWORD __BIGGEST_ALIGNMENT__
+#endif
+#endif /*BIGWORD*/
+
+#endif /* COSMOPOLITAN_LIBC_BITS_BIGWORD_H_ */