This PR separate addend from FMA operands to support cascade FMA. In
some microarchitectures (e.g., ARM cortex-a72 and XiangShan-NanHu), FP
multiply-accumulate pipelines support late-forwarding of accumulate
operands, which reduces the latency of a sequence of multiply-accumulate
instructions.
See also #70232.
D150312 added a TODO:
TODO: consider renaming the field `StartAtCycle` and `Cycles` to
`AcquireAtCycle` and `ReleaseAtCycle` respectively, to stress the
fact that resource allocation is now represented as an interval,
relatively to the issue cycle of the instruction.
This patch implements that TODO. This naming clarifies how to use these
fields in the scheduler. In addition it was confusing that `StartAtCycle` was
singular but `Cycles` was plural. This renaming fixes this inconsistency.
This commit as previously reverted since it missed renaming that came
down after rebasing. This version of the commit fixes those problems.
Differential Revision: https://reviews.llvm.org/D158568
D150312 added a TODO:
TODO: consider renaming the field `StartAtCycle` and `Cycles` to
`AcquireAtCycle` and `ReleaseAtCycle` respectively, to stress the
fact that resource allocation is now represented as an interval,
relatively to the issue cycle of the instruction.
This patch implements that TODO. This naming clarifies how to use these
fields in the scheduler. In addition it was confusing that `StartAtCycle` was
singular but `Cycles` was plural. This renaming fixes this inconsistency.
This commit as previously reverted since it missed renaming that came
down after rebasing. This version of the commit fixes those problems.
Differential Revision: https://reviews.llvm.org/D158568
D150312 added a TODO:
TODO: consider renaming the field `StartAtCycle` and `Cycles` to
`AcquireAtCycle` and `ReleaseAtCycle` respectively, to stress the
fact that resource allocation is now represented as an interval,
relatively to the issue cycle of the instruction.
This patch implements that TODO. This naming clarifies how to use these
fields in the scheduler. In addition it was confusing that `StartAtCycle` was
singular but `Cycles` was plural. This renaming fixes this inconsistency.
Differential Revision: https://reviews.llvm.org/D158568
SCR1 is available at https://github.com/syntacore/scr1
'syntacore-scr1-base' corresponds to SCR1_CFG_RV32IC_BASE,
'syntacore-scr1-max' corresponds to SCR1_CFG_RV32IMC_MAX.
SCR1_CFG_RV32EC_MIN is RV32EC, which is currently unsupported.
Reviewed By: craig.topper
Differential Revision: https://reviews.llvm.org/D139302
