Commit d04a1456df996aa51dd5eb5857528ed4a237ca13 | zig | Meg's Mirrors

author	Andrew Kelley <andrew@ziglang.org> 2019-03-21 16:35:18-04:00
committer	Andrew Kelley <andrew@ziglang.org> 2019-03-21 16:35:18-04:00
log	d04a1456df996aa51dd5eb5857528ed4a237ca13
tree	6f69a86696797ed91ef7ee95a1e63e5b68103074
parent	af509c68b01c8645e5efaeec7ea11e809f34ba7d
signature	Commit is signed but in an unrecognized format.

hex float parsing: solve another case

this works now: 0x1.edcb34a235253948765432134674fp-1

2 files changed, 11 insertions(+), 2 deletions(-)

src
- tokenizer.cpp
test
- stage1
  - behavior
    math.zig

src/tokenizer.cpp+3

...	...	@@ -365,6 +365,9 @@ static void end_float_token(Tokenize *t) {
365	365	bigint_init_unsigned(&shift_bigint, -shift);
366	366	BigInt shifted_significand;
367	367	bigint_shr(&shifted_significand, &t->significand, &shift_bigint);
	368	if (t->exponent_in_bin_or_dec == -1) {
	369	bigint_incr(&shifted_significand);
	370	}
368	371	bigint_write_twos_complement(&shifted_significand, (uint8_t*) f_bits.repr, 128, false);
369	372	} else {
370	373	uint64_t sig_bits[2] = {0, 0};

test/stage1/behavior/math.zig+8-2

...	...	@@ -310,8 +310,14 @@ test "quad hex float literal parsing accurate" {
310	310
311	311	const S = struct {
312	312	fn doTheTest() void {
313		var f1: f128 = 0x1.2eab345678439abcdefea56782346p+5;
314		expect(@bitCast(u128, f1) == 0x40042eab345678439abcdefea5678234);
	313	{
	314	var f1: f128 = 0x1.2eab345678439abcdefea56782346p+5;
	315	expect(@bitCast(u128, f1) == 0x40042eab345678439abcdefea5678234);
	316	}
	317	{
	318	var f: f128 = 0x1.edcb34a235253948765432134674fp-1;
	319	expect(@bitCast(u128, f) == 0x3ffeedcb34a235253948765432134675);
	320	}
315	321	const exp2ft = []f64{
316	322	0x1.6a09e667f3bcdp-1,
317	323	0x1.7a11473eb0187p-1,