"TMS320C55x DSP Library DSPLIB Programmer's Reference"

maxidxmaxidxFunctionIndex of the Maximum Element of a Vectorshort r = maxidx (DATA *x, ushort ng, ushort ng_size);(defined in maxidx.asm)Argumentsx[nx]rngng_sizePointer to input vector of size nx.Index for vector element with maximum value.Number of groups.Size of group.DescriptionThe vector x is divided in ng groups of size ng_size.Size of x = ng x ng_size. ng_size must be an even number between 2 and 34.The larger ng_size, the better the performance.Returns the index of the maximumelement of a vector x. In case of multiple maximum elements, r containsthe index of the first maximum element found.Example 1: size of x is 64.Choose ng_size = 32, ng = 2Example 2: size of x is 100.Choose ng_size = 20, ng = 5Example 3: size of x is 90.Choose ng_size = 30, ng = 3AlgorithmNot applicableOverflow Handling MethodologyNot applicableSpecial Requirements ng_size is an even number between 2 and 34Implementation Notes noneExampleBenchmarksSee examples/maxidx subdirectory(preliminary)Cycles † Core: nx/2 + ng16Overhead: 40Code size(in bytes)143† Assumes all data is in on-chip dual-access RAM and that there is no bus conflict due to twiddletable reads and instruction fetches (provided linker command file reflects those conditions).Function Descriptions4-69