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MIPS 5kc backend - single issue or limited dual issue
- From: Cherry Vanc <cherry dot vanc at gmail dot com>
- To: gcc-help at gcc dot gnu dot org
- Date: Fri, 5 Sep 2014 13:03:48 -0700
- Subject: MIPS 5kc backend - single issue or limited dual issue
- Authentication-results: sourceware.org; auth=none
According to the SPEC, The 5kc MIPS64 processor has a limited dual
issue pipeline. However, the file comment header of 5k.md file in
gcc/config/mips folder :
;; 5Kc - Single issue with no floating point unit.
;; 5kf - Separate floating point pipe which can dual-issue with the
;; integer pipe.
So the 5kc is being implemented as a single issue pipeline and not a
limited dual issue ? The generated code also seems to be for a
single-issue pipeline.
Is this true that the 5k implementation is a single-issue pipeline indeed ?
Thanks