Miroirs/crab
1
0
Fork 0
mirror of https://github.com/mattrberry/crab.git synced 2025-01-15 03:40:56 +01:00
Code Issues Projects Releases Packages Wiki Activity

asr simply return the word if the shift is 0

Browse source
This commit is contained in:
Matthew Berry 2020-10-18 11:38:56 -07:00
parent c6a1db4f6c
commit e64b17aea4
1 changed files with 1 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
src/crab/cpu.cr
View file

@ -103,7 +103,7 @@ class CPU
# Arithmetic shift right # Arithmetic shift right
def asr(word : Word, bits : Int, set_conditions : Bool) : Word def asr(word : Word, bits : Int, set_conditions : Bool) : Word
log "asr - word:#{hex_str word}, bits:#{bits}" log "asr - word:#{hex_str word}, bits:#{bits}"
bits = 32 if bits == 0 return word if bits == 0
@cpsr.carry = bit?(word, bits - 1) if set_conditions @cpsr.carry = bit?(word, bits - 1) if set_conditions
word >> bits | (0xFFFFFFFF_u32 &* (word >> 31)) << (32 - bits) word >> bits | (0xFFFFFFFF_u32 &* (word >> 31)) << (32 - bits)
end end