Macros and postincrement

[jean343]

When using the postincrement operator (i++) in an SIMDE function call, it sometimes gets incremented multiple times because of macro syntax. See this question for reference.

In my specific case, the function _mm_srli_epi32(InReg1, shift++) ends up incrementing shift by 4 only on the ARM platform. This is very difficult to debug as the code is working on Intel machines, and the code in question is nested very deep in a third party library.

I would recommend something like this. The code does work on ARM. It does not compile on Visual Studio, but it's also not required in VS.

#elif defined(SIMDE_ARM_NEON_A32V7_NATIVE)
  #define simde_mm_srli_epi32(a, _imm8) \
    ({ typeof (_imm8) imm8 = (_imm8); \
    (((imm8) <= 0) ? \
      (a) : \
      simde__m128i_from_neon_u32( \
        ((imm8) > 31) ? \
          vandq_u32(simde__m128i_to_neon_u32(a), vdupq_n_u32(0)) : \
          vshrq_n_u32(simde__m128i_to_neon_u32(a), ((imm8) & 31) | (((imm8) & 31) == 0)))); })