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| author | Ramana Radhakrishnan <ramana.radhakrishnan@arm.com> | 2015-09-14 13:16:59 +0000 |
|---|---|---|
| committer | Ramana Radhakrishnan <ramana@gcc.gnu.org> | 2015-09-14 13:16:59 +0000 |
| commit | b4f50fd4c09a6bb80947e7ea4ee46c976ad44d96 (patch) | |
| tree | 1da7640d452969bb8627ff1d214216b843d57b15 /gcc/config/aarch64/iterators.md | |
| parent | 641f1ab4ed20677f2c9515bb039d8263a463576f (diff) | |
| download | gcc-b4f50fd4c09a6bb80947e7ea4ee46c976ad44d96.zip gcc-b4f50fd4c09a6bb80947e7ea4ee46c976ad44d96.tar.gz gcc-b4f50fd4c09a6bb80947e7ea4ee46c976ad44d96.tar.bz2 | |
[AArch64] Handle literal pools for functions > 1 MiB in size.
This patch fixes the issue in PR63304 where we have
functions that are > 1MiB. The idea is to use adrp / ldr or adrp / add
instructions to address the literal pools under the use of a command line
option. I would like to turn this on by default on trunk but keep this
disabled by default for the release branches in order to get some
serious testing for this feature while it bakes on trunk.
As a follow-up I would like to try and see if estimate_num_insns or
something else can give us a heuristic to turn this on for "large" functions.
After all the number of incidences of this are quite low in real life,
so may be we should look to restrict this use as much as possible on the
grounds that this code generation implies an extra integer register for
addressing for every floating point and vector constant and I don't think
that's great in code that already may have high register pressure.
Tested on aarch64-none-elf with no regressions. A previous
version was bootstrapped and regression tested.
Applied to trunk.
regards
Ramana
2015-09-14 Ramana Radhakrishnan <ramana.radhakrishnan@arm.com>
PR target/63304
* config/aarch64/aarch64.c (aarch64_expand_mov_immediate): Handle
nopcrelative_literal_loads.
(aarch64_classify_address): Likewise.
(aarch64_constant_pool_reload_icode): Define.
(aarch64_secondary_reload): Handle secondary reloads for
literal pools.
(aarch64_override_options): Handle nopcrelative_literal_loads.
(aarch64_classify_symbol): Handle nopcrelative_literal_loads.
* config/aarch64/aarch64.md (aarch64_reload_movcp<GPF_TF:mode><P:mode>):
Define.
(aarch64_reload_movcp<VALL:mode><P:mode>): Likewise.
* config/aarch64/aarch64.opt (mpc-relative-literal-loads): New option.
* config/aarch64/predicates.md (aarch64_constant_pool_symref): New
predicate.
* doc/invoke.texi (mpc-relative-literal-loads): Document.
From-SVN: r227748
Diffstat (limited to 'gcc/config/aarch64/iterators.md')
| -rw-r--r-- | gcc/config/aarch64/iterators.md | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/gcc/config/aarch64/iterators.md b/gcc/config/aarch64/iterators.md index ff69800..42cb979 100644 --- a/gcc/config/aarch64/iterators.md +++ b/gcc/config/aarch64/iterators.md @@ -44,6 +44,9 @@ ;; Double vector modes. (define_mode_iterator VDF [V2SF V4HF]) +;; Iterator for all scalar floating point modes (SF, DF and TF) +(define_mode_iterator GPF_TF [SF DF TF]) + ;; Integer vector modes. (define_mode_iterator VDQ_I [V8QI V16QI V4HI V8HI V2SI V4SI V2DI]) |