This is an attempt to reland D42600 and enabling this optimisation by default.
This also resolves the issue pointed out in the context of PGO build.
Differential Revision: https://reviews.llvm.org/D42600
This reverts commit 1ddfd1c8186735c62b642df05c505dc4907ffac4.
The original commit causes a Chrome build assertion failure with
ThinLTO: https://crbug.com/1443635
This patch splits a restore point to allow it to only post-dominate blocks reachable by use
or def of CSRs(Callee Saved Registers)/FI(Frame Index).
Benchmarking this on SPEC2017, this gives around 4% improvement on povray and no significant change
for others.
Co-authored-by: junbuml
Differential Revision: https://reviews.llvm.org/D42600
doesn't happened in peephole optimizer.
Summary: Converting a comparison against 1 or -1 into a comparison
against 0 can exploit record-form instructions for comparison optimization.
The conversion will happen only when a record-form instruction can be used
to replace the comparison during the peephole optimizer (see function optimizeCompareInstr).
In post-RA, we also want to optimize the comparison by using the record
form (see D131873) and it requires additional dataflow analysis to reliably
find uses of the CR register set.
It's reasonable to common the conversion for both peephole optimizer and
post-RA optimizer.
Converting to comparison against zero even when the optimization doesn't
happened in peephole optimizer may create additional opportunities for the
post-RA optimization.
Reviewed By: nemanjai
Differential Revision: https://reviews.llvm.org/D131374
Summary:
Currently Shrinkwrap is not enabled on AIX.
This patch enables shrink wrap on 32 and 64 bit AIX, and 64 bit ELF.
Reviewed By: sfertile, nemanjai
Differential Revision: https://reviews.llvm.org/D95094
Putting the +1 before the zero-extend will allow scalar evolution to fold the expression in some cases such as the one shown in PowerPC's `shrink-wrap.ll` test.
Reviewed By: samparker
Differential Revision: https://reviews.llvm.org/D91724
