[all-commits] [llvm/llvm-project] 685c8b: [AARCH64] Improve accumulator forwarding for Corte...
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Mon Jan 4 03:03:33 PST 2021
Branch: refs/heads/master
Home: https://github.com/llvm/llvm-project
Commit: 685c8b537af3138cff24ec6060a86140b8963a1e
https://github.com/llvm/llvm-project/commit/685c8b537af3138cff24ec6060a86140b8963a1e
Author: Usman Nadeem <mnadeem at quicinc.com>
Date: 2021-01-04 (Mon, 04 Jan 2021)
Changed paths:
M llvm/lib/Target/AArch64/AArch64SchedA57.td
M llvm/lib/Target/AArch64/AArch64SchedA57WriteRes.td
A llvm/test/tools/llvm-mca/AArch64/Cortex/forwarding-A57.s
Log Message:
-----------
[AARCH64] Improve accumulator forwarding for Cortex-A57 model
The old CPU model only had MLA->MLA forwarding. I added some missing
MUL->MLA read advances and a missing absolute diff accumulator read
advance according to the Cortex A57 Software Optimization Guide.
The patch improves performance in EEMBC rgbyiqv2 by about 6%-7% and
spec2006/milc by 8% (repeated runs on multiple devices), causes no
significant regressions (none in SPEC).
Differential Revision: https://reviews.llvm.org/D92296
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