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Merge pull request #354 from lioncash/usaduflow

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armemu: Fix underflows in USAD8/USADA8
This commit is contained in:
bunnei
2014-12-28 11:57:25 -05:00
parent 3422d81f05 059c65a27a
commit 762f16c4ad
3 changed files with 14 additions and 4 deletions
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8
src/core/arm/interpreter/armemu.cpp
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@ -6672,10 +6672,10 @@ L_stm_s_takeabort:
const u32 rm_val = state->Reg[rm_idx];
const u32 rn_val = state->Reg[rn_idx];
const u8 diff1 = (u8)std::labs((rn_val & 0xFF) - (rm_val & 0xFF));
const u8 diff2 = (u8)std::labs(((rn_val >> 8) & 0xFF) - ((rm_val >> 8) & 0xFF));
const u8 diff3 = (u8)std::labs(((rn_val >> 16) & 0xFF) - ((rm_val >> 16) & 0xFF));
const u8 diff4 = (u8)std::labs(((rn_val >> 24) & 0xFF) - ((rm_val >> 24) & 0xFF));
const u8 diff1 = ARMul_UnsignedAbsoluteDifference(rn_val & 0xFF, rm_val & 0xFF);
const u8 diff2 = ARMul_UnsignedAbsoluteDifference((rn_val >> 8) & 0xFF, (rm_val >> 8) & 0xFF);
const u8 diff3 = ARMul_UnsignedAbsoluteDifference((rn_val >> 16) & 0xFF, (rm_val >> 16) & 0xFF);
const u8 diff4 = ARMul_UnsignedAbsoluteDifference((rn_val >> 24) & 0xFF, (rm_val >> 24) & 0xFF);
u32 finalDif = (diff1 + diff2 + diff3 + diff4);