Commit 4a35d7eeebec3f345e2482bc189f07c19dcf6f8b | zig

Unblocks #495.

2 files changed, 17 insertions(+), 2 deletions(-)

src/tokenizer.cpp+9-2

...	...	@@ -357,12 +357,19 @@ static void end_float_token(Tokenize *t) {
357	357	// Mask the sign bit to 0 since always non-negative lex
358	358	const uint64_t exp_mask = 0xffffull << exp_shift;
359	359
360		if (shift >= 64) {
	360	// must be special-cased to avoid undefined behavior on shift == 64
	361	if (shift == 128) {
	362	f_bits.repr[0] = 0;
	363	f_bits.repr[1] = sig_bits[0];
	364	} else if (shift == 0) {
	365	f_bits.repr[0] = sig_bits[0];
	366	f_bits.repr[1] = sig_bits[1];
	367	} else if (shift >= 64) {
361	368	f_bits.repr[0] = 0;
362	369	f_bits.repr[1] = sig_bits[0] << (shift - 64);
363	370	} else {
364	371	f_bits.repr[0] = sig_bits[0] << shift;
365		f_bits.repr[1] = ((sig_bits[1] << shift) \| (sig_bits[0] >> (64 - shift)));
	372	f_bits.repr[1] = (sig_bits[1] << shift) \| (sig_bits[0] >> (64 - shift));
366	373	}
367	374
368	375	f_bits.repr[1] &= ~exp_mask;

test/cases/math.zig+8

...	...	@@ -296,6 +296,14 @@ test "quad hex float literal parsing in range" {
296	296	const d = 0x1.edcbff8ad76ab5bf46463233214fp-435;
297	297	}
298	298
	299	test "quad hex float literal parsing accurate" {
	300	const a: f128 = 0x1.1111222233334444555566667777p+0;
	301
	302	// implied 1 is dropped, with an exponent of 0 (0x3fff) after biasing.
	303	const expected: u128 = 0x3fff1111222233334444555566667777;
	304	assert(@bitCast(u128, a) == expected);
	305	}
	306
299	307	test "hex float literal within range" {
300	308	const a = 0x1.0p16383;
301	309	const b = 0x0.1p16387;