diff options
| author | bd <bdunahu@operationnull.com> | 2025-04-16 23:35:59 -0400 |
|---|---|---|
| committer | bd <bdunahu@operationnull.com> | 2025-04-16 23:35:59 -0400 |
| commit | 796b2691146a3a4eaace4fa155d3c0c2f7379832 (patch) | |
| tree | 8dd83f646bd9ef29ff3c3c492e4f64485d44c1b7 /inc | |
| parent | 23d3ebb2702e6b08c7f6b997067e1bc76483b813 (diff) | |
Fix a bug related to parsing immediates in decode
Diffstat (limited to 'inc')
| -rw-r--r-- | inc/pipe_spec.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/inc/pipe_spec.h b/inc/pipe_spec.h index 772314e..d211b72 100644 --- a/inc/pipe_spec.h +++ b/inc/pipe_spec.h @@ -65,4 +65,21 @@ */ #define GET_MID_BITS(k, m, n) GET_LS_BITS((k) >> (m), ((n) - (m))) +/** + * Return the bits from integer K starting at N and ending at M using a bit + * mask, but sign-extends the result. This is required to parse immediates. + * @param the integer to be parsed + * @param the index of the starting bit to be parsed + * @param the index of the ending bit to be parsed + * @return a section of bits from K + */ +// clang-format off +#define GET_BITS_SIGN_EXTEND(k, m, n) \ + ({\ + int _f = GET_MID_BITS(k, m, n); \ + int _w = (n) - (m) - (1); \ + _f = (_f & (1 << (_w - 1))) ? (_f | (-1 << _w)) : _f; \ + }) +// clang-format on + #endif /* DEFINITIONS_H_INCLUDED */ |