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| author | Richard Biener <rguenther@suse.de> | 2023-03-02 13:43:51 +0100 |
|---|---|---|
| committer | Richard Biener <rguenther@suse.de> | 2023-03-03 08:26:58 +0100 |
| commit | 6010189923908501ca5b02bd1f4aee05d2283118 (patch) | |
| tree | d2d2108d9e45f2673a33fb2a5bb1c2c640124250 /gcc/gdbhooks.py | |
| parent | 33ca5c92dfa7e2f591a838bb768d9d6eea56793b (diff) | |
| download | gcc-6010189923908501ca5b02bd1f4aee05d2283118.zip gcc-6010189923908501ca5b02bd1f4aee05d2283118.tar.gz gcc-6010189923908501ca5b02bd1f4aee05d2283118.tar.bz2 | |
target/108738 - limit STV chain discovery
The following puts a hard limit on the inherently quadratic STV chain
discovery. Without a limit for the compiler.i testcase in PR26854
we see at -O2
machine dep reorg : 574.45 ( 53%)
with release checking while with the proposed limit it's
machine dep reorg : 2.86 ( 1%)
PR target/108738
* config/i386/i386.opt (--param x86-stv-max-visits): New param.
* doc/invoke.texi (--param x86-stv-max-visits): Document it.
* config/i386/i386-features.h (scalar_chain::max_visits): New.
(scalar_chain::build): Add bitmap parameter, return boolean.
(scalar_chain::add_insn): Likewise.
(scalar_chain::analyze_register_chain): Likewise.
* config/i386/i386-features.cc (scalar_chain::scalar_chain):
Initialize max_visits.
(scalar_chain::analyze_register_chain): When we exhaust
max_visits, abort. Also abort when running into any
disallowed insn.
(scalar_chain::add_insn): Propagate abort.
(scalar_chain::build): Likewise. When aborting amend
the set of disallowed insn with the insns set.
(convert_scalars_to_vector): Adjust. Do not convert aborted
chains.
Diffstat (limited to 'gcc/gdbhooks.py')
0 files changed, 0 insertions, 0 deletions