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Rewrite a terrible comment about the machine model. 

llvm-svn: 202576
This commit is contained in:
Andrew Trick 2014-03-01 07:57:02 +00:00
parent fb54821398
commit a83c75d2fd
1 changed files with 10 additions and 6 deletions
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16
llvm/include/llvm/MC/MCSchedule.h
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@ -32,12 +32,16 @@ struct MCProcResourceDesc {
// Number of resources that may be buffered.
//
// Buffered resources (BufferSize > 0 || BufferSize == -1) may be consumed at
// some indeterminate cycle after dispatch (e.g. for instructions that may
// issue out-of-order). Unbuffered resources (BufferSize == 0) always consume
// their resource some fixed number of cycles after dispatch (e.g. for
// instruction interlocking that may stall the pipeline). If BufferSize==1,
// the latency between producer and consumer is modeled as a stall.
// Buffered resources (BufferSize != 0) may be consumed at some indeterminate
// cycle after dispatch. This should be used for out-of-order cpus when
// instructions that use this resource can be buffered in a reservaton
// station.
//
// Unbuffered resources (BufferSize == 0) always consume their resource some
// fixed number of cycles after dispatch. If a resource is unbuffered, then
// the scheduler will avoid scheduling instructions with conflicting resources
// in the same cycle. This is for in-order cpus, or the in-order portion of
// an out-of-order cpus.
int BufferSize;
bool operator==(const MCProcResourceDesc &Other) const {