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translate-c: translate 80/128-bit long double literals

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Carl Åstholm
2023-11-01 19:12:54 +01:00
committed by Veikka Tuominen
parent 40bd93e2a2
commit 8bf4b3c611
5 changed files with 77 additions and 15 deletions
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14
test/translate_c.zig
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@@ -1240,6 +1240,7 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
\\extern const float my_float = 1.0f;
\\extern const double my_double = 1.0;
\\extern const long double my_longdouble = 1.0l;
\\extern const long double my_extended_precision_longdouble = 1.0000000000000003l;
, &([_][]const u8{
"pub const foo = @as(f32, 3.14);",
"pub const bar = @as(c_longdouble, 16.0e-2);",
@@ -1250,13 +1251,14 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
"pub const foobar = -@as(c_longdouble, 73.0);",
"pub export const my_float: f32 = 1.0;",
"pub export const my_double: f64 = 1.0;",
} ++ if (@bitSizeOf(c_longdouble) != 64) .{
// TODO properly translate non-64-bit long doubles
"source.h:10:42: warning: unsupported floating point constant format",
"source.h:10:26: warning: unable to translate variable initializer, demoted to extern",
"pub extern const my_longdouble: c_longdouble;",
} else .{
"pub export const my_longdouble: c_longdouble = 1.0;",
switch (@bitSizeOf(c_longdouble)) {
// TODO implement decimal format for f128 <https://github.com/ziglang/zig/issues/1181>
// (so that f80/f128 values not exactly representable as f64 can be emitted in decimal form)
80 => "pub export const my_extended_precision_longdouble: c_longdouble = 0x1.000000000000159ep0;",
128 => "pub export const my_extended_precision_longdouble: c_longdouble = 0x1.000000000000159e05f1e2674d21p0;",
else => "pub export const my_extended_precision_longdouble: c_longdouble = 1.0000000000000002;",
},
}));
cases.add("macro defines hexadecimal float",