Fixed-point functions can take specific precision (#1086)

test/asm/fixed-point-specific.asm

@@ -0,0 +1,27 @@
+MACRO compare
+	print "\3: "
+	if _NARG == 4
+		def v1 = \3(\4q\1, \1)
+		def v2 = \3(\4q\2, \2)
+	elif _NARG == 5
+		def v1 = \3(\4q\1, \5q\1, \1)
+		def v2 = \3(\4q\2, \5q\2, \2)
+	endc
+	opt Q\1
+	print "{.4f:v1} == "
+	opt Q\2
+	println "{.4f:v2}"
+ENDM
+
+	compare  8, 16, mul, 6.0, 7.0
+	compare 12, 24, div, 115.625, 9.25
+	compare  7, 14, pow, 3.5, 5.5
+
+	compare  4,  8, sin, 0.25
+	compare  5,  9, cos, 0.75
+	compare  6, 10, asin, 1.0
+	compare  7, 11, acos, 0.0
+
+	compare  3,  6, round, 1.75
+	compare 10, 20, ceil, 123.4
+	compare 13, 17, floor, 567.8

test/asm/fixed-point-specific.out

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+mul: 42.0000 == 42.0000
+div: 12.5000 == 12.5000
+pow: 982.5938 == 982.5943
+sin: 1.0000 == 1.0000
+cos: 0.0000 == 0.0000
+asin: 0.2500 == 0.2500
+acos: 0.2500 == 0.2500
+round: 2.0000 == 2.0000
+ceil: 124.0000 == 124.0000
+floor: 567.0000 == 567.0000