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Diffstat (limited to 'src/devices/cpu/mips/mips3.cpp')
-rw-r--r--src/devices/cpu/mips/mips3.cpp38
1 files changed, 2 insertions, 36 deletions
diff --git a/src/devices/cpu/mips/mips3.cpp b/src/devices/cpu/mips/mips3.cpp
index df9ff7f96ba..178d81fadbd 100644
--- a/src/devices/cpu/mips/mips3.cpp
+++ b/src/devices/cpu/mips/mips3.cpp
@@ -3530,47 +3530,13 @@ void mips3_device::handle_special(uint32_t op)
m_core->icount -= 35;
break;
case 0x1c: /* DMULT */
- {
- uint64_t a_hi = (uint32_t)(RSVAL64 >> 32);
- uint64_t b_hi = (uint32_t)(RTVAL64 >> 32);
- uint64_t a_lo = (uint32_t)RSVAL64;
- uint64_t b_lo = (uint32_t)RTVAL64;
- uint64_t p1 = a_lo * b_lo;
- uint64_t p2 = a_hi * b_lo;
- uint64_t p3 = a_lo * b_hi;
- uint64_t p4 = a_hi * b_hi;
- uint64_t carry = (uint32_t)(((p1 >> 32) + (uint32_t)p2 + (uint32_t)p3) >> 32);
-
- LOVAL64 = p1 + (p2 << 32) + (p3 << 32);
- HIVAL64 = p4 + (p2 >> 32) + (p3 >> 32) + carry;
-
- // Adjust for sign
- if (RSVAL64 < 0)
- HIVAL64 -= RTVAL64;
- if (RTVAL64 < 0)
- HIVAL64 -= RSVAL64;
-
+ LOVAL64 = mul_64x64(RSVAL64, RTVAL64, reinterpret_cast<s64 *>(&HIVAL64));
m_core->icount -= 7;
break;
- }
case 0x1d: /* DMULTU */
- {
- uint64_t a_hi = (uint32_t)(RSVAL64 >> 32);
- uint64_t b_hi = (uint32_t)(RTVAL64 >> 32);
- uint64_t a_lo = (uint32_t)RSVAL64;
- uint64_t b_lo = (uint32_t)RTVAL64;
- uint64_t p1 = a_lo * b_lo;
- uint64_t p2 = a_hi * b_lo;
- uint64_t p3 = a_lo * b_hi;
- uint64_t p4 = a_hi * b_hi;
- uint64_t carry = (uint32_t)(((p1 >> 32) + (uint32_t)p2 + (uint32_t)p3) >> 32);
-
- LOVAL64 = p1 + (p2 << 32) + (p3 << 32);
- HIVAL64 = p4 + (p2 >> 32) + (p3 >> 32) + carry;
-
+ LOVAL64 = mulu_64x64(RSVAL64, RTVAL64, &HIVAL64);
m_core->icount -= 7;
break;
- }
case 0x1e: /* DDIV */
if (RTVAL64)
{