Machine model comments. Explain a ProcessorUnit's BufferSize.

[oota-llvm.git] / include / llvm / MC / MCSchedule.h

diff --git a/include/llvm/MC/MCSchedule.h b/include/llvm/MC/MCSchedule.h
index 8cd56b331571efb90900368013a300e71c0f1eb0..7d85f83119bbc5b9cc5419698a72bffba924bae2 100644 (file)
--- a/include/llvm/MC/MCSchedule.h
+++ b/include/llvm/MC/MCSchedule.h
@@ -36,7 +36,8 @@ struct MCProcResourceDesc {
   // 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).
+  // instruction interlocking that may stall the pipeline). If BufferSize==1,
+  // the latency between producer and consumer is modeled as a stall.
   int BufferSize;
 
   bool operator==(const MCProcResourceDesc &Other) const {