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fix signed long multiply and negative flag

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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
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12
src/crab/arm/multiply_long.cr
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@ -9,16 +9,16 @@ module ARM
rm = bits(instr, 0..3) rm = bits(instr, 0..3)
res = if signed 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 else
(0_u64 | @r[rm]) &* @r[rs] @r[rm].to_u64 &* @r[rs]
end end
res &+= (0_u64 | @r[rdhi]) << 32 | @r[rdlo] if accumulate res &+= @r[rdhi].to_u64 << 32 | @r[rdlo] if accumulate
@r[rdhi] = 0_u32 | res >> 32 @r[rdhi] = (res >> 32).to_u32!
@r[rdlo] = 0xFFFFFFFF_u32 & res @r[rdlo] = res.to_u32!
if set_conditions if set_conditions
@cpsr.zero = res == 0 @cpsr.zero = res == 0
@cpsr.negative = bit?(res, 63) @cpsr.negative = bit?(@r[rdhi], 31)
end end
end end
end end