Fixed-point values can use all 32-Q magnitude bits (#1085)

test/asm/fixed-point-magnitude.asm

@@ -1,13 +1,19 @@
-OPT Q.4
-println 1.0
-println -1.0
-println 0.0625
-println -0.0625
-println 7.25
-println -7.25
-println 12.25
-println -12.25
-println 15.9375
-println -15.9375
-println 20.0
-println -20.0
+for precision, 1, 32
+	opt Q{d:precision}
+	def magnitude = 32 - precision
+
+	def maxInt = 1 << magnitude - 1
+	redef defMaxValue equs "def maxValue = {d:maxInt}.0"
+	{defMaxValue}
+	println "Q.{2d:precision}: max ok  = 1 << {2d:magnitude} - 1  = {11d:maxInt}.0 = {#09x:maxValue}"
+
+	def minBadInt = maxInt + 1
+	redef defMinBadValue equs "def minBadValue = {d:minBadInt}.0"
+	{defMinBadValue}
+	println "Q.{2d:precision}: min bad = 1 << {2d:magnitude}      = {11d:minBadInt}.0 = {#09x:minBadValue}"
+
+	def worseInt = minBadInt + 42
+	redef defWorseValue equs "def worseValue = {d:worseInt}.0"
+	{defWorseValue}
+	println "Q.{2d:precision}: worse   = 1 << {2d:magnitude} + 42 = {11d:worseInt}.0 = {#09x:worseValue}"
+endr