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authorbunnei <bunneidev@gmail.com>2014-12-30 04:15:15 +0100
committerbunnei <bunneidev@gmail.com>2014-12-30 04:15:15 +0100
commit021fb420752aa34dc3bee70fb2f3fe673176594f (patch)
treec5b620ccf025845e87e81f8079dc9438f052dae7 /src/core/arm/interpreter/armsupp.cpp
parentMerge pull request #253 from purpasmart96/mem_map (diff)
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Diffstat (limited to 'src/core/arm/interpreter/armsupp.cpp')
-rw-r--r--src/core/arm/interpreter/armsupp.cpp35
1 files changed, 35 insertions, 0 deletions
diff --git a/src/core/arm/interpreter/armsupp.cpp b/src/core/arm/interpreter/armsupp.cpp
index 8b3661c8f..426b67831 100644
--- a/src/core/arm/interpreter/armsupp.cpp
+++ b/src/core/arm/interpreter/armsupp.cpp
@@ -578,6 +578,41 @@ u16 ARMul_UnsignedSaturatedSub16(u16 left, u16 right)
return left - right;
}
+// Signed saturation.
+u32 ARMul_SignedSatQ(s32 value, u8 shift, bool* saturation_occurred)
+{
+ const u32 max = (1 << shift) - 1;
+ const s32 top = (value >> shift);
+
+ if (top > 0) {
+ *saturation_occurred = true;
+ return max;
+ }
+ else if (top < -1) {
+ *saturation_occurred = true;
+ return ~max;
+ }
+
+ *saturation_occurred = false;
+ return (u32)value;
+}
+
+// Unsigned saturation
+u32 ARMul_UnsignedSatQ(s32 value, u8 shift, bool* saturation_occurred)
+{
+ const u32 max = (1 << shift) - 1;
+
+ if (value < 0) {
+ *saturation_occurred = true;
+ return 0;
+ } else if ((u32)value > max) {
+ *saturation_occurred = true;
+ return max;
+ }
+
+ *saturation_occurred = false;
+ return (u32)value;
+}
/* This function does the work of generating the addresses used in an
LDC instruction. The code here is always post-indexed, it's up to the