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Fix underflow issue with USAD8/USADA8.

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xdec 2014-12-28 02:12:35 -08:00
parent 3422d81f05
commit 3c5aa6f4d6
1 changed files with 4 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 = (u8)std::labs( ((s32) (rn_val & 0xFF)) - ((s32) (rm_val & 0xFF)) );
const u8 diff2 = (u8)std::labs( ((s32) ((rn_val >> 8) & 0xFF)) - ((s32) ((rm_val >> 8) & 0xFF)) );
const u8 diff3 = (u8)std::labs( ((s32) ((rn_val >> 16) & 0xFF)) - ((s32) ((rm_val >> 16) & 0xFF)) );
const u8 diff4 = (u8)std::labs( ((s32) ((rn_val >> 24) & 0xFF)) - ((s32) ((rm_val >> 24) & 0xFF)) );
u32 finalDif = (diff1 + diff2 + diff3 + diff4);