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authorGravatar Lioncash2015-01-02 18:21:45 -0500
committerGravatar Lioncash2015-01-02 18:29:30 -0500
commit3337b846204c3d18fde4e28ad1558f5e73532ccc (patch)
tree32689d9d8e3c8cb811682c9b025370fa0c332844 /src/core/arm/interpreter/armsupp.cpp
parentMerge pull request #382 from lioncash/sx (diff)
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dyncom: Implement SMLAD/SMUAD/SMLSD/SMUSD
Diffstat (limited to 'src/core/arm/interpreter/armsupp.cpp')
-rw-r--r--src/core/arm/interpreter/armsupp.cpp8
1 files changed, 5 insertions, 3 deletions
diff --git a/src/core/arm/interpreter/armsupp.cpp b/src/core/arm/interpreter/armsupp.cpp
index 426b67831..eec34143e 100644
--- a/src/core/arm/interpreter/armsupp.cpp
+++ b/src/core/arm/interpreter/armsupp.cpp
@@ -453,12 +453,14 @@ ARMul_AddOverflow (ARMul_State * state, ARMword a, ARMword b, ARMword result)
453 ASSIGNV (AddOverflow (a, b, result)); 453 ASSIGNV (AddOverflow (a, b, result));
454} 454}
455 455
456/* Assigns the Q flag if the given result is considered an overflow from the addition of a and b */ 456// Returns true if the Q flag should be set as a result of overflow.
457void ARMul_AddOverflowQ(ARMul_State* state, ARMword a, ARMword b) 457bool ARMul_AddOverflowQ(ARMword a, ARMword b)
458{ 458{
459 u32 result = a + b; 459 u32 result = a + b;
460 if (((result ^ a) & (u32)0x80000000) && ((a ^ b) & (u32)0x80000000) == 0) 460 if (((result ^ a) & (u32)0x80000000) && ((a ^ b) & (u32)0x80000000) == 0)
461 SETQ; 461 return true;
462
463 return false;
462} 464}
463 465
464/* Assigns the C flag after an subtraction of a and b to give result. */ 466/* Assigns the C flag after an subtraction of a and b to give result. */