Add subtraction operators to SIMD_32 classes, needed for XTEA decrypt

2 files changed, 26 insertions, 0 deletions

diff --git a/src/utils/simd_32/simd_scalar.h b/src/utils/simd_32/simd_scalar.h
index a6067f115..4b81c183b 100644
--- a/src/utils/simd_32/simd_scalar.h
+++ b/src/utils/simd_32/simd_scalar.h
@@ -96,6 +96,22 @@ class SIMD_Scalar
                             R3 + other.R3);
          }
 
+      void operator-=(const SIMD_Scalar& other)
+         {
+         R0 -= other.R0;
+         R1 -= other.R1;
+         R2 -= other.R2;
+         R3 -= other.R3;
+         }
+
+      SIMD_Scalar operator-(const SIMD_Scalar& other) const
+         {
+         return SIMD_Scalar(R0 - other.R0,
+                            R1 - other.R1,
+                            R2 - other.R2,
+                            R3 - other.R3);
+         }
+
       void operator^=(const SIMD_Scalar& other)
          {
          R0 ^= other.R0;
diff --git a/src/utils/simd_32/simd_sse.h b/src/utils/simd_32/simd_sse.h
index d9135f1c7..d2ef4b211 100644
--- a/src/utils/simd_32/simd_sse.h
+++ b/src/utils/simd_32/simd_sse.h
@@ -70,6 +70,16 @@ class SIMD_SSE2
          return _mm_add_epi32(reg, other.reg);
          }
 
+      void operator-=(const SIMD_SSE2& other)
+         {
+         reg = _mm_sub_epi32(reg, other.reg);
+         }
+
+      SIMD_SSE2 operator-(const SIMD_SSE2& other) const
+         {
+         return _mm_sub_epi32(reg, other.reg);
+         }
+
       void operator^=(const SIMD_SSE2& other)
          {
          reg = _mm_xor_si128(reg, other.reg);