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sharc.cpp: fix LSHIFT negative operations to not extend the sign on result, fixes Last Bronx frame flickering [Angelo Salese]

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This commit is contained in:
angelosa 2018-03-14 00:38:54 +01:00
parent 4b356e3b2c
commit 7ae8a01086
1 changed files with 7 additions and 6 deletions
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13
src/devices/cpu/sharc/sharcops.hxx
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@ -472,9 +472,9 @@ void adsp21062_device::SHIFT_OPERATION_IMM(int shiftop, int data, int rn, int rx
case 0x00: /* LSHIFT Rx BY <data8>*/
{
if(shift < 0) {
REG(rn) = (shift > -32 ) ? (REG(rx) >> -shift) : 0;
REG(rn) = (shift > -32 ) ? ((uint32_t)REG(rx) >> -shift) : 0;
} else {
REG(rn) = (shift < 32) ? (REG(rx) << shift) : 0;
REG(rn) = (shift < 32) ? ((uint32_t)REG(rx) << shift) : 0;
if (shift > 0)
{
m_core->astat |= SV;
@ -524,14 +524,15 @@ void adsp21062_device::SHIFT_OPERATION_IMM(int shiftop, int data, int rn, int rx
{
uint32_t r = 0;
if(shift < 0) {
r = (shift > -32 ) ? (REG(rx) >> -shift) : 0;
r = (shift > -32 ) ? ((uint32_t)REG(rx) >> -shift) : 0;
} else {
r = (shift < 32) ? (REG(rx) << shift) : 0;
r = (shift < 32) ? ((uint32_t)REG(rx) << shift) : 0;
if (shift > 0)
{
m_core->astat |= SV;
}
}
SET_FLAG_SZ(r);
REG(rn) = REG(rn) | r;
@ -887,11 +888,11 @@ void adsp21062_device::COMPUTE(uint32_t opcode)
int shift = REG(ry);
if(shift < 0)
{
REG(rn) = (shift > -32 ) ? (REG(rx) >> -shift) : 0;
REG(rn) = (shift > -32 ) ? ((uint32_t)REG(rx) >> -shift) : 0;
}
else
{
REG(rn) = (shift < 32) ? (REG(rx) << shift) : 0;
REG(rn) = (shift < 32) ? ((uint32_t)REG(rx) << shift) : 0;
if (shift > 0)
{
m_core->astat |= SV;