https://llvm.org/bugs/show_bug.cgi?id=24522
Bug ID: 24522
Summary: [AArch64 MachineCombine] Enhance/Add support for
general reassociation to reduce the critical path
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: Backend: AArch64
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected],
[email protected]
Classification: Unclassified
The x86 target supports general reassociation optimizations in the machine
combiner. We should support/extend the same type of optimization for AArch64.
Here are a few of the related commits (not necessarily all inclusive):
r239486: [x86] Add a reassociation optimization to increase ILP via the
MachineCombiner pass
r240361: [x86] generalize reassociation optimization in machine combiner to 2
instructions
r241515: [x86] extend machine combiner reassociation optimization to SSE scalar
adds
r241752: [x86] enable machine combiner reassociations for scalar
single-precision multiplies
r241871: [x86] enable machine combiner reassociations for scalar
double-precision adds
IIRC, this might improve the performance of 188.ammp.
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