From 0c50a0b4fe3956f9d2e08e75d47c9cbd79bf0268 Mon Sep 17 00:00:00 2001 From: Rekai Gonzalez-Alberquilla Date: Mon, 6 Feb 2017 11:10:06 +0000 Subject: cpu: Fix the usage of const DynInstPtr Summary: Usage of const DynInstPtr& when possible and introduction of move operators to RefCountingPtr. In many places, scoped references to dynamic instructions do a copy of the DynInstPtr when a reference would do. This is detrimental to performance. On top of that, in case there is a need for reference tracking for debugging, the redundant copies make the process much more painful than it already is. Also, from the theoretical point of view, a function/method that defines a convenience name to access an instruction should not be considered an owner of the data, i.e., doing a copy and not a reference is not justified. On a related topic, C++11 introduces move semantics, and those are useful when, for example, there is a class modelling a HW structure that contains a list, and has a getHeadOfList function, to prevent doing a copy to an internal variable -> update pointer, remove from the list -> update pointer, return value making a copy to the assined variable -> update pointer, destroy the returned value -> update pointer. Change-Id: I3bb46c20ef23b6873b469fd22befb251ac44d2f6 Signed-off-by: Giacomo Gabrielli Reviewed-on: https://gem5-review.googlesource.com/c/13105 Reviewed-by: Andreas Sandberg Reviewed-by: Jason Lowe-Power Maintainer: Andreas Sandberg Maintainer: Jason Lowe-Power --- src/cpu/base_dyn_inst_impl.hh | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'src/cpu/base_dyn_inst_impl.hh') diff --git a/src/cpu/base_dyn_inst_impl.hh b/src/cpu/base_dyn_inst_impl.hh index b499fe4e6..f638f754c 100644 --- a/src/cpu/base_dyn_inst_impl.hh +++ b/src/cpu/base_dyn_inst_impl.hh @@ -217,7 +217,7 @@ BaseDynInst::markSrcRegReady(RegIndex src_idx) template bool -BaseDynInst::eaSrcsReady() +BaseDynInst::eaSrcsReady() const { // For now I am assuming that src registers 1..n-1 are the ones that the // EA calc depends on. (i.e. src reg 0 is the source of the data to be -- cgit v1.2.3