RealView Compilation Tools Compiler Reference Guide - ARM ...

Compiler-specific Features
Note
Each ARMv6 SIMD intrinsic is guaranteed to be compiled into a single, inline, machine
instruction for an ARM v6 architecture or processor. However, the compiler might use
optimized forms of underlying instructions when it detects opportunities to do so.
The ARMv6 SIMD instructions can set the GE[3:0] bits in the Application Program
Status Register (APSR). The SIMD instructions might update these flags to indicate the
“greater than or equal to” status of each 8/16-bit slice of a SIMD operation.
The ARM compiler treats the GE[3:0] bits as a global variable. To access these bits from
within your C or C++ program, either:
• access bits 16-19 of the APSR through a named register variable
• use the __sel intrinsic to control a SEL instruction.
unsigned int __qadd16(unsigned int, unsigned int)
unsigned int __qadd8(unsigned int, unsigned int)
unsigned int __qasx(unsigned int, unsigned int)
unsigned int __qsax(unsigned int, unsigned int)
unsigned int __qsub16(unsigned int, unsigned int)
unsigned int __qsub8(unsigned int, unsigned int)
unsigned int __sadd16(unsigned int, unsigned int)
unsigned int __sadd8(unsigned int, unsigned int)
unsigned int __sasx(unsigned int, unsigned int)
unsigned int __sel(unsigned int, unsigned int)
unsigned int __shadd16(unsigned int, unsigned int)
unsigned int __shadd8(unsigned int, unsigned int)
unsigned int __shasx(unsigned int, unsigned int)
unsigned int __shsax(unsigned int, unsigned int)
unsigned int __shsub16(unsigned int, unsigned int)
unsigned int __shsub8(unsigned int, unsigned int)
unsigned int __smlad(unsigned int, unsigned int, unsigned int)
unsigned long long __smlald(unsigned int, unsigned int, unsigned long long)
unsigned int __smlsd(unsigned int, unsigned int, unsigned int)
unsigned long long __smlsld(unsigned int, unsigned int, unsigned long long)
unsigned int __smuad(unsigned int, unsigned int)
unsigned int __smusd(unsigned int, unsigned int)
unsigned int __ssat16(unsigned int, unsigned int)
unsigned int __ssax(unsigned int, unsigned int)
unsigned int __ssub16(unsigned int, unsigned int)
unsigned int __ssub8(unsigned int, unsigned int)
unsigned int __sxtab16(unsigned int, unsigned int)
unsigned int __sxtb16(unsigned int, unsigned int)
unsigned int __uadd16(unsigned int, unsigned int)
unsigned int __uadd8(unsigned int, unsigned int)
unsigned int __uasx(unsigned int, unsigned int)
unsigned int __uhadd16(unsigned int, unsigned int)
unsigned int __uhadd8(unsigned int, unsigned int)
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