+
+#!-(and win32 (not sb-thread))
+(deftransform sleep ((seconds) ((integer 0 #.(expt 10 8))))
+ `(sb!unix:nanosleep seconds 0))
+
+#!-(and win32 (not sb-thread))
+(deftransform sleep ((seconds) ((constant-arg (real 0))))
+ (let ((seconds-value (lvar-value seconds)))
+ (multiple-value-bind (seconds nano)
+ (sb!impl::split-seconds-for-sleep seconds-value)
+ (if (> seconds (expt 10 8))
+ (give-up-ir1-transform)
+ `(sb!unix:nanosleep ,seconds ,nano)))))