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Preface Introduction Getting started with the ARM Compiler Compiler Features Intrinsics
About intrinsics Instruction intrinsics ETSI basic operations TI C55x intrinsics Named register variables Pragmas Coding Practices Diagnostic Messages Using the Inline and Embedded Assemblers SemihostingTI C55x intrinsics
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| Home > Compiler Features > Intrinsics > TI C55x intrinsics | |||
The Texas Instruments (TI) C55x compiler recognizes a number of intrinsics for the optimization of C code. RVCT supports the emulation of selected TI C55x intrinsics through the header file, c55x.h. TI C55x intrinsics that are emulated in c55x.h include:
Intrinsics for addition, subtraction, negation and absolute value, such as
_saddand_ssub. For example,_sadd(v1, v2)returns the 16‑bit saturated sum ofv1andv2.Intrinsics for multiplication and shifting, such as
_smpyand_sshl. For example,_smpy(v1, v2)returns the saturated fractional‑mode product ofv1andv2.Intrinsics for rounding, saturation, bitcount and extremum, such as
_roundand_count. For example,_round(v1)returns the valuev1rounded by adding 215 using unsaturated arithmetic, clearing the lower 16 bits.
The following TI C55x intrinsics are not supported in c55x.h:
Associative variants of intrinsics for addition and multiply‑and‑accumulate. This includes all TI C55x intrinsics prefixed with
_a_, for example,_a_saddand _a_smac.Rounding variants of intrinsics for multiplication and shifting, for example,
_smacrand_smasr.All long long variants of intrinsics. This includes all TI C55x intrinsics prefixed with
_ll, for example,_llsaddand_llshl. long long variants of intrinsics are not supported in RVCT because they operate on 40-bit data.All arithmetic intrinsics with side effects. For example, the TI C55x intrinsics
_firsand_lmsare not defined inc55x.h.Intrinsics for ETSI support functions, such as
L_add_candL_sub_c.Note
An exception is the ETSI support function for saturating division,
divs. This intrinsic is supported inc55x.h.
See the header file c55x.h for a complete list of the TI C55x intrinsics emulated in RVCT.
For more information on TI compiler intrinsics see http://www.ti.com.
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