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arm7thmb.cpp this should be more accurate ROR fix

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This commit is contained in:
MetalliC 2020-08-05 02:30:22 +03:00
parent 365d94a31b
commit b943e67aa4
1 changed files with 3 additions and 3 deletions
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6
src/devices/cpu/arm7/arm7thmb.cpp
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@ -657,12 +657,12 @@ void arm7_cpu_device::tg04_00_07(uint32_t pc, uint32_t op) /* ROR Rd, Rs */
const uint32_t rs = (op & THUMB_ADDSUB_RS) >> THUMB_ADDSUB_RS_SHIFT;
const uint32_t rd = (op & THUMB_ADDSUB_RD) >> THUMB_ADDSUB_RD_SHIFT;
const uint32_t rrd = GetRegister(rd);
const uint32_t imm = GetRegister(rs);
const uint32_t imm = GetRegister(rs) & 0xff;
const uint32_t imm_masked = imm & 0x1f;
SetRegister(rd, (rrd >> imm_masked) | (rrd << (32 - imm_masked)));
if (imm > 0)
{
if (rrd & (1 << (imm - 1)))
SetRegister(rd, (rrd >> imm_masked) | (rrd << (32 - imm_masked)));
if (rrd & (1 << ((imm - 1) & 0x1f)))
{
set_cpsr(GET_CPSR | C_MASK);
}