Fix warnings in Altivec header and add AltiVec detection for POWER8

1 files changed, 37 insertions, 40 deletions

diff --git a/src/lib/simd/simd_altivec/simd_altivec.h b/src/lib/simd/simd_altivec/simd_altivec.h
index f675587bc..133061b97 100644
--- a/src/lib/simd/simd_altivec/simd_altivec.h
+++ b/src/lib/simd/simd_altivec/simd_altivec.h
@@ -26,17 +26,17 @@ class SIMD_Altivec
 
       SIMD_Altivec(const u32bit B[4])
          {
-         reg = (__vector unsigned int){B[0], B[1], B[2], B[3]};
+         m_reg = (__vector unsigned int){B[0], B[1], B[2], B[3]};
          }
 
       SIMD_Altivec(u32bit B0, u32bit B1, u32bit B2, u32bit B3)
          {
-         reg = (__vector unsigned int){B0, B1, B2, B3};
+         m_reg = (__vector unsigned int){B0, B1, B2, B3};
          }
 
       SIMD_Altivec(u32bit B)
          {
-         reg = (__vector unsigned int){B, B, B, B};
+         m_reg = (__vector unsigned int){B, B, B, B};
          }
 
       static SIMD_Altivec load_le(const void* in)
@@ -80,7 +80,7 @@ class SIMD_Altivec
             u32bit R[4];
             } vec;
 
-         vec.V = vec_perm(reg, reg, perm);
+         vec.V = vec_perm(m_reg, m_reg, perm);
 
          Botan::store_be(out, vec.R[0], vec.R[1], vec.R[2], vec.R[3]);
          }
@@ -92,17 +92,15 @@ class SIMD_Altivec
             u32bit R[4];
             } vec;
 
-         vec.V = reg;
+         vec.V = m_reg;
 
          Botan::store_be(out, vec.R[0], vec.R[1], vec.R[2], vec.R[3]);
          }
 
       void rotate_left(size_t rot)
          {
-         __vector unsigned int rot_vec =
-            (__vector unsigned int){rot, rot, rot, rot};
-
-         reg = vec_rl(reg, rot_vec);
+         const unsigned int r = static_cast<unsigned int>(rot);
+         m_reg = vec_rl(m_reg, (__vector unsigned int){r, r, r, r});
          }
 
       void rotate_right(size_t rot)
@@ -112,74 +110,73 @@ class SIMD_Altivec
 
       void operator+=(const SIMD_Altivec& other)
          {
-         reg = vec_add(reg, other.reg);
+         m_reg = vec_add(m_reg, other.m_reg);
          }
 
       SIMD_Altivec operator+(const SIMD_Altivec& other) const
          {
-         return vec_add(reg, other.reg);
+         return vec_add(m_reg, other.m_reg);
          }
 
       void operator-=(const SIMD_Altivec& other)
          {
-         reg = vec_sub(reg, other.reg);
+         m_reg = vec_sub(m_reg, other.m_reg);
          }
 
       SIMD_Altivec operator-(const SIMD_Altivec& other) const
          {
-         return vec_sub(reg, other.reg);
+         return vec_sub(m_reg, other.m_reg);
          }
 
       void operator^=(const SIMD_Altivec& other)
          {
-         reg = vec_xor(reg, other.reg);
+         m_reg = vec_xor(m_reg, other.m_reg);
          }
 
       SIMD_Altivec operator^(const SIMD_Altivec& other) const
          {
-         return vec_xor(reg, other.reg);
+         return vec_xor(m_reg, other.m_reg);
          }
 
       void operator|=(const SIMD_Altivec& other)
          {
-         reg = vec_or(reg, other.reg);
+         m_reg = vec_or(m_reg, other.m_reg);
          }
 
       SIMD_Altivec operator&(const SIMD_Altivec& other)
          {
-         return vec_and(reg, other.reg);
+         return vec_and(m_reg, other.m_reg);
          }
 
       void operator&=(const SIMD_Altivec& other)
          {
-         reg = vec_and(reg, other.reg);
+         m_reg = vec_and(m_reg, other.m_reg);
          }
 
       SIMD_Altivec operator<<(size_t shift) const
          {
-         __vector unsigned int shift_vec =
-            (__vector unsigned int){shift, shift, shift, shift};
-
-         return vec_sl(reg, shift_vec);
+         const unsigned int s = static_cast<unsigned int>(shift);
+         return vec_sl(m_reg, (__vector unsigned int){s, s, s, s});
          }
 
       SIMD_Altivec operator>>(size_t shift) const
          {
-         __vector unsigned int shift_vec =
-            (__vector unsigned int){shift, shift, shift, shift};
-
-         return vec_sr(reg, shift_vec);
+         const unsigned int s = static_cast<unsigned int>(shift);
+         return vec_sr(m_reg, (__vector unsigned int){s, s, s, s});
          }
 
       SIMD_Altivec operator~() const
          {
-         return vec_nor(reg, reg);
+         return vec_nor(m_reg, m_reg);
          }
 
       SIMD_Altivec andc(const SIMD_Altivec& other)
          {
-         // AltiVec does arg1 & ~arg2 rather than SSE's ~arg1 & arg2
-         return vec_andc(other.reg, reg);
+         /*
+         AltiVec does arg1 & ~arg2 rather than SSE's ~arg1 & arg2
+         so swap the arguments
+         */
+         return vec_andc(other.m_reg, m_reg);
          }
 
       SIMD_Altivec bswap() const
@@ -188,27 +185,27 @@ class SIMD_Altivec
 
          perm = vec_xor(perm, vec_splat_u8(3));
 
-         return SIMD_Altivec(vec_perm(reg, reg, perm));
+         return SIMD_Altivec(vec_perm(m_reg, m_reg, perm));
          }
 
       static void transpose(SIMD_Altivec& B0, SIMD_Altivec& B1,
                             SIMD_Altivec& B2, SIMD_Altivec& B3)
          {
-         __vector unsigned int T0 = vec_mergeh(B0.reg, B2.reg);
-         __vector unsigned int T1 = vec_mergel(B0.reg, B2.reg);
-         __vector unsigned int T2 = vec_mergeh(B1.reg, B3.reg);
-         __vector unsigned int T3 = vec_mergel(B1.reg, B3.reg);
+         __vector unsigned int T0 = vec_mergeh(B0.m_reg, B2.m_reg);
+         __vector unsigned int T1 = vec_mergel(B0.m_reg, B2.m_reg);
+         __vector unsigned int T2 = vec_mergeh(B1.m_reg, B3.m_reg);
+         __vector unsigned int T3 = vec_mergel(B1.m_reg, B3.m_reg);
 
-         B0.reg = vec_mergeh(T0, T2);
-         B1.reg = vec_mergel(T0, T2);
-         B2.reg = vec_mergeh(T1, T3);
-         B3.reg = vec_mergel(T1, T3);
+         B0.m_reg = vec_mergeh(T0, T2);
+         B1.m_reg = vec_mergel(T0, T2);
+         B2.m_reg = vec_mergeh(T1, T3);
+         B3.m_reg = vec_mergel(T1, T3);
          }
 
    private:
-      SIMD_Altivec(__vector unsigned int input) { reg = input; }
+      SIMD_Altivec(__vector unsigned int input) { m_reg = input; }
 
-      __vector unsigned int reg;
+      __vector unsigned int m_reg;
    };
 
 }