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Some BLAS routines do not require matrices or vectors to be initialized in certain use cases. For example, in GEMM when beta=zero, C is set rather than updated, thus input values of C should not be used. In these cases set the inital values of such matrices or vectors to an extreme value, to help detect if these are incorrectly being read. The extreme value can be NaN or Inf. The default is Inf, change it by running cmake ... -DEXT_VALUE=NaN AMD-Internal: [CPUPL-4548] Change-Id: I4a665363779d2496b8247f6357e970b7f23cd1eb