diff options
Diffstat (limited to 'src/tokenizer.cpp')
| -rw-r--r-- | src/tokenizer.cpp | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/src/tokenizer.cpp b/src/tokenizer.cpp index 2950b4eb49..f7f41af8a6 100644 --- a/src/tokenizer.cpp +++ b/src/tokenizer.cpp @@ -357,12 +357,19 @@ static void end_float_token(Tokenize *t) { // Mask the sign bit to 0 since always non-negative lex const uint64_t exp_mask = 0xffffull << exp_shift; - if (shift >= 64) { + // must be special-cased to avoid undefined behavior on shift == 64 + if (shift == 128) { + f_bits.repr[0] = 0; + f_bits.repr[1] = sig_bits[0]; + } else if (shift == 0) { + f_bits.repr[0] = sig_bits[0]; + f_bits.repr[1] = sig_bits[1]; + } else if (shift >= 64) { f_bits.repr[0] = 0; f_bits.repr[1] = sig_bits[0] << (shift - 64); } else { f_bits.repr[0] = sig_bits[0] << shift; - f_bits.repr[1] = ((sig_bits[1] << shift) | (sig_bits[0] >> (64 - shift))); + f_bits.repr[1] = (sig_bits[1] << shift) | (sig_bits[0] >> (64 - shift)); } f_bits.repr[1] &= ~exp_mask; |