mirror of
https://github.com/Mercury-Language/mercury.git
synced 2026-04-16 09:53:36 +00:00
8fe2751758
Add functions for performing conversion of 8- and 16-bit integers to floats.
Since the ranges of all these integer types lie within the what can be exactly
represented by both single- and double-precision floating-point values, these
conversions always succeed.
Add a note about the float/1 function.
library/float.m:
Add the new conversion functions.
Note that the behaviour of float/1 is currently undefined if the
argument is outside the range that the floating-point type can exactly
represent integers.
Fix section headings.
tests/hard_coded/Mmakfile:;
tests/hard_coded/float_conv.{m,exp}
A test of int->float conversion; currently for 8- and 16-bit integers.
99 lines
2.1 KiB
Mathematica
99 lines
2.1 KiB
Mathematica
%---------------------------------------------------------------------------%
|
|
% vim: ft=mercury ts=4 sw=4 et
|
|
%---------------------------------------------------------------------------%
|
|
|
|
:- module float_conv.
|
|
:- interface.
|
|
|
|
:- import_module io.
|
|
|
|
:- pred main(io::di, io::uo) is det.
|
|
|
|
%---------------------------------------------------------------------------%
|
|
%---------------------------------------------------------------------------%
|
|
|
|
:- implementation.
|
|
|
|
:- import_module float.
|
|
:- import_module list.
|
|
:- import_module string.
|
|
|
|
%---------------------------------------------------------------------------%
|
|
|
|
main(!IO) :-
|
|
io.write_string("*** Testing int8 -> float conversion ***\n\n", !IO),
|
|
run_test("from_int8", float.from_int8, int8s, !IO),
|
|
io.write_string("\n*** Testing uint8 -> float conversion ***\n\n", !IO),
|
|
run_test("from_uint8", float.from_uint8, uint8s, !IO),
|
|
io.write_string("\n*** Testing int16 -> float conversion ***\n\n", !IO),
|
|
run_test("from_int16", float.from_int16, int16s, !IO),
|
|
io.write_string("\n*** Testing uint16 -> float conversion ***\n\n", !IO),
|
|
run_test("from_uint16", float.from_uint16, uint16s, !IO).
|
|
|
|
:- pred run_test(string::in, (func(T) = float)::in, list(T)::in,
|
|
io::di, io::uo) is det.
|
|
|
|
run_test(ConvDesc, ConvFunc, Ints, !IO) :-
|
|
list.foldl(do_test(ConvDesc, ConvFunc), Ints, !IO).
|
|
|
|
:- pred do_test(string::in, (func(T) = float)::in, T::in, io::di, io::uo) is det.
|
|
|
|
do_test(ConvDesc, ConvFunc, Int, !IO) :-
|
|
io.write_string(ConvDesc ++ "(", !IO),
|
|
io.write(Int, !IO),
|
|
io.write_string(") = ", !IO),
|
|
Float = ConvFunc(Int),
|
|
io.write_line(Float, !IO).
|
|
|
|
:- func int8s = list(int8).
|
|
|
|
int8s = [
|
|
-128i8,
|
|
-1i8,
|
|
0i8,
|
|
8i8,
|
|
16i8,
|
|
32i8,
|
|
64i8,
|
|
127i8
|
|
].
|
|
|
|
:- func uint8s = list(uint8).
|
|
|
|
uint8s = [
|
|
0u8,
|
|
1u8,
|
|
2u8,
|
|
8u8,
|
|
23u8,
|
|
127u8,
|
|
128u8,
|
|
255u8
|
|
].
|
|
|
|
:- func int16s = list(int16).
|
|
|
|
int16s = [
|
|
-32768i16,
|
|
-129i16,
|
|
-128i16,
|
|
-1i16,
|
|
0i16,
|
|
1i16,
|
|
127i16,
|
|
128i16,
|
|
32767i16
|
|
].
|
|
|
|
:- func uint16s = list(uint16).
|
|
|
|
uint16s = [
|
|
0u16,
|
|
1u16,
|
|
8u16,
|
|
127u16,
|
|
128u16,
|
|
32767u16
|
|
].
|
|
|