RealView Compilation Tools - ARM Information Center

Compiler-specific Features
}
int32_t c, d, e, f;
Overflow = 0;
// set global overflow flag
c = C_L_add(a, b); // C saturating add
d = asm_L_add(a, b); // assembly language saturating add
e = __qadd(a, b); // ARM intrinsic saturating add
f = L_add(a, b); // ETSI saturating add
return Overflow -1 : c == d == e == f; // returns 1, unless overflow
See also
• the header file dspfns.h for definitions of the ETSI basic operations as a
combination of C code and intrinsics
• ETSI basic operations on page 4-6 in the Compiler User Guide
• ETSI Recommendation G.191: Software tools for speech and audio coding
standardization
• ITU-T Software Tool Library 2005 User's manual, included as part of ETSI
Recommendation G.191
• ETSI Recommendation G723.1 : Dual rate speech coder for multimedia
communications transmitting at 5.3 and 6.3 kbit/s
• ETSI Recommendation G.729: Coding of speech at 8 kbit/s using
conjugate-structure algebraic-code-excited linear prediction (CS-ACELP).
4.7.108 C55x intrinsics
The ARM compiler supports the emulation of selected TI C55x compiler intrinsics.
To make use of the TI C55x intrinsics in your own code, include the standard header file
c55x.h. The intrinsics supplied in c55x.h are listed in Table 4-21.
Table 4-21 TI C55x intrinsics supported in RVCT
Intrinsics
_abss _lshrs _rnd _smas
_count _lsadd _norm _smpy
_divs _lsmpy _round _sneg
_labss _lsneg _roundn _sround
_lmax _lsshl _sadd _sroundn
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