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hex float parsing: solve another case

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this works now: 0x1.edcb34a235253948765432134674fp-1
This commit is contained in:
Andrew Kelley 2019-03-21 16:35:18 -04:00
parent af509c68b0
commit d04a1456df
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GPG Key ID: 7C5F548F728501A9
2 changed files with 11 additions and 2 deletions
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3
src/tokenizer.cpp
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@ -365,6 +365,9 @@ static void end_float_token(Tokenize *t) {
bigint_init_unsigned(&shift_bigint, -shift);
BigInt shifted_significand;
bigint_shr(&shifted_significand, &t->significand, &shift_bigint);
if (t->exponent_in_bin_or_dec == -1) {
bigint_incr(&shifted_significand);
}
bigint_write_twos_complement(&shifted_significand, (uint8_t*) f_bits.repr, 128, false);
} else {
uint64_t sig_bits[2] = {0, 0};

10
test/stage1/behavior/math.zig
View File

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