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

fix signed long multiply and negative flag

Browse source
This commit is contained in:
Matthew Berry 2020-10-17 11:18:22 -07:00
parent b51e07b643
commit cce814a3a7
1 changed files with 6 additions and 6 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

12
src/crab/arm/multiply_long.cr
View file

@ -9,16 +9,16 @@ module ARM
rm = bits(instr, 0..3)
res = if signed
(@r[rm].to_i32!.to_i64 &* @r[rs]).to_u64 # todo make this just bit math...
@r[rm].to_i32!.to_i64 &* @r[rs].to_i32!
else
(0_u64 | @r[rm]) &* @r[rs]
@r[rm].to_u64 &* @r[rs]
end
res &+= (0_u64 | @r[rdhi]) << 32 | @r[rdlo] if accumulate
@r[rdhi] = 0_u32 | res >> 32
@r[rdlo] = 0xFFFFFFFF_u32 & res
res &+= @r[rdhi].to_u64 << 32 | @r[rdlo] if accumulate
@r[rdhi] = (res >> 32).to_u32!
@r[rdlo] = res.to_u32!
if set_conditions
@cpsr.zero = res == 0
@cpsr.negative = bit?(res, 63)
@cpsr.negative = bit?(@r[rdhi], 31)
end
end
end