Jakob Stoklund Olesen 9f63e10427 Start scaffolding for a MachineTraceMetrics analysis pass. ... This is still a work in progress. Out-of-order CPUs usually execute instructions from multiple basic blocks simultaneously, so it is necessary to look at longer traces when estimating the performance effects of code transformations. The MachineTraceMetrics analysis will pick a typical trace through a given basic block and provide performance metrics for the trace. Metrics will include: - Instruction count through the trace. - Issue count per functional unit. - Critical path length, and per-instruction 'slack'. These metrics can be used to determine the performance limiting factor when executing the trace, and how it will be affected by a code transformation. Initially, this will be used by the early if-conversion pass. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160796 91177308-0d34-0410-b5e6-96231b3b80d8		2012-07-26 18:38:11 +00:00
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llvm	Start scaffolding for a MachineTraceMetrics analysis pass.	2012-07-26 18:38:11 +00:00
llvm-c	Remove tabs.	2012-07-19 00:01:33 +00:00