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author | Korey Sewell <ksewell@umich.edu> | 2010-04-10 23:31:36 -0400 |
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committer | Korey Sewell <ksewell@umich.edu> | 2010-04-10 23:31:36 -0400 |
commit | b49511ae4843fc7af3b28d7dfdb18d4e474b81d3 (patch) | |
tree | e7a8e0fe0d96f8cee1a6bb809a43003dcd2701ea /src/cpu/inorder/reg_dep_map.hh | |
parent | d71f9712b3640239f70382baade7439ac783f9a1 (diff) | |
download | gem5-b49511ae4843fc7af3b28d7dfdb18d4e474b81d3.tar.xz |
inorder: timing for inst forwarding
when insts execute, they mark the time they finish to be used for subsequent isnts
they may need forwarding of data. However, the regdepmap was using the wrong
value to index into the destination operands of the instruction to be forwarded.
Thus, in some cases, we are checking to see if the 3rd destination register
for an instruction is executed at a certain time, when there is only 1 dest. register
valid. Thus, we get a bad, uninitialized time value that will stall forwarding
causing performance loss but still the correct execution.
Diffstat (limited to 'src/cpu/inorder/reg_dep_map.hh')
-rw-r--r-- | src/cpu/inorder/reg_dep_map.hh | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/cpu/inorder/reg_dep_map.hh b/src/cpu/inorder/reg_dep_map.hh index cb9d35bf4..2e938a6b5 100644 --- a/src/cpu/inorder/reg_dep_map.hh +++ b/src/cpu/inorder/reg_dep_map.hh @@ -77,7 +77,7 @@ class RegDepMap /** Is the current instruction able to get a forwarded value from another instruction * for this destination register? */ - DynInstPtr canForward(unsigned reg_idx, unsigned src_idx, DynInstPtr inst); + DynInstPtr canForward(unsigned reg_idx, DynInstPtr inst); /** find an instruction to forward/bypass a value from */ DynInstPtr findBypassInst(unsigned idx); |