Fix rounding of fixed-point constants where fractional digits should carry into integer part (#2088)

test/asm/fixed-point-carry.asm

@@ -0,0 +1,17 @@
+opt Q8
+println strfmt("%f", 1.999)
+println strfmt("%f", 2.999)
+println strfmt("%f", 3.999)
+println strfmt("%f", 16777215.999)
+
+opt Q16
+println strfmt("%f", 1.999999)
+println strfmt("%f", 2.999999)
+println strfmt("%f", 3.999999)
+println strfmt("%f", 65535.999999)
+
+opt Q24
+println strfmt("%f", 1.999999999)
+println strfmt("%f", 2.999999999)
+println strfmt("%f", 3.999999999)
+println strfmt("%f", 255.999999999)

test/asm/fixed-point-carry.err

@@ -0,0 +1,6 @@
+warning: Magnitude of fixed-point constant is too large [-Wlarge-constant]
+    at fixed-point-carry.asm(5)
+warning: Magnitude of fixed-point constant is too large [-Wlarge-constant]
+    at fixed-point-carry.asm(11)
+warning: Magnitude of fixed-point constant is too large [-Wlarge-constant]
+    at fixed-point-carry.asm(17)

test/asm/fixed-point-carry.out

@@ -0,0 +1,12 @@
+2.00000
+3.00000
+4.00000
+0.00000
+2.00000
+3.00000
+4.00000
+0.00000
+2.00000
+3.00000
+4.00000
+0.00000

test/asm/fixed-point-syntax.out

@@ -5,9 +5,9 @@ $18B
 $62B85
 $4
 $10000
+$20000
 $10000
-$10000
-$10000
+$20000
 $C570A
 $13333
 $13333