diff options
Diffstat (limited to 'opcodes/mt-ibld.c')
| -rw-r--r-- | opcodes/mt-ibld.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/opcodes/mt-ibld.c b/opcodes/mt-ibld.c index ffc7910..c678e99 100644 --- a/opcodes/mt-ibld.c +++ b/opcodes/mt-ibld.c @@ -207,12 +207,19 @@ insert_normal (CGEN_CPU_DESC cd, #if CGEN_INT_INSN_P { - int shift; + int shift_within_word, shift_to_word, shift; + /* How to shift the value to BIT0 of the word. */ + shift_to_word = total_length - (word_offset + word_length); + + /* How to shift the value to the field within the word. */ if (CGEN_INSN_LSB0_P) - shift = (word_offset + start + 1) - length; + shift_within_word = start + 1 - length; else - shift = total_length - (word_offset + start + length); + shift_within_word = word_length - start - length; + + /* The total SHIFT, then mask in the value. */ + shift = shift_to_word + shift_within_word; *buffer = (*buffer & ~(mask << shift)) | ((value & mask) << shift); } |