Code Development Steps - Texas Instruments TMS320C6000 Programmer's Manual

Code Development Flow To Increase Performance
Table 1–1. Code Development Steps
Phase
1
Phase Phase
2
Phase
3
1-6
Table 1–1, Code Development Steps , describes the recommended code de-
velopment flow for developing code which achieves the highest performance
on loops.
Step Description
1 Compile and profile native C/C++ code
Validates original C/C++ code
Determines which loops are most important in terms of MIPS require-
ments.
2 Add restrict qualifier, loop iteration count, memory bank, and data alignment
information.
Reduces potential pointer aliasing problems
Allows loops with indeterminate iteration counts to execute epilogs
Uses pragmas to pass count information to the compiler
Uses memory bank pragmas and _nassert intrinsic to pass memory
bank and alignment information to the compiler.
3 Optimize C code using other 'C6000 intrinsics and other methods
Facilitates use of certain 'C6000 instructions not easily represented in
C.
Optimizes data flow bandwidth (uses word access for short ('C62x,
'C64x, and 'C67x) data, and double word access for word ('C64x, and
'C67x) data).
4a Write linear assembly
Allows control in determining exact 'C6000 instructions to be used
Provides flexibility of hand-coded assembly without worry of pipelining,
parallelism, or register allocation.
Can pass memory bank information to the tools
Uses .trip directive to convey loop count information
4b Add partitioning information to the linear assembly
Can improve partitioning of loops when necessary
Can avoid bottlenecks of certain hardware resources