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| author | Jan Hubicka <jh@suse.cz> | 2021-12-13 17:29:26 +0100 |
|---|---|---|
| committer | Jan Hubicka <jh@suse.cz> | 2021-12-13 17:30:13 +0100 |
| commit | 16c848090f237c2398930b8c0ef75acebf4fa44d (patch) | |
| tree | a4f3291b1af698d22a2ad009f2b08ffab81d3950 | |
| parent | 5954b4d415f6424f1232c6b22a772ce184773f54 (diff) | |
| download | gcc-16c848090f237c2398930b8c0ef75acebf4fa44d.zip gcc-16c848090f237c2398930b8c0ef75acebf4fa44d.tar.gz gcc-16c848090f237c2398930b8c0ef75acebf4fa44d.tar.bz2 | |
Add -fipa-strict-aliasing
gcc/ChangeLog:
2021-12-13 Jan Hubicka <hubicka@ucw.cz>
* common.opt: Add -fipa-strict-aliasing.
* doc/invoke.texi: Document -fipa-strict-aliasing.
* ipa-modref.c (modref_access_analysis::record_access): Honor
-fipa-strict-aliasing.
(modref_access_analysis::record_access_lto): Likewise.
| -rw-r--r-- | gcc/common.opt | 4 | ||||
| -rw-r--r-- | gcc/doc/invoke.texi | 12 | ||||
| -rw-r--r-- | gcc/ipa-modref.c | 8 |
3 files changed, 20 insertions, 4 deletions
diff --git a/gcc/common.opt b/gcc/common.opt index 445a53a..8f8fc2f 100644 --- a/gcc/common.opt +++ b/gcc/common.opt @@ -1945,6 +1945,10 @@ fira-algorithm= Common Joined RejectNegative Enum(ira_algorithm) Var(flag_ira_algorithm) Init(IRA_ALGORITHM_CB) Optimization -fira-algorithm=[CB|priority] Set the used IRA algorithm. +fipa-strict-aliasing +Common Var(flag_ipa_strict_aliasing) Init(1) Optimization +Assume strict aliasing rules apply across (uninlined) function boundaries. + Enum Name(ira_algorithm) Type(enum ira_algorithm) UnknownError(unknown IRA algorithm %qs) diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 221c7c3..80c36b9 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -570,7 +570,7 @@ Objective-C and Objective-C++ Dialects}. -fsingle-precision-constant -fsplit-ivs-in-unroller -fsplit-loops@gol -fsplit-paths @gol -fsplit-wide-types -fsplit-wide-types-early -fssa-backprop -fssa-phiopt @gol --fstdarg-opt -fstore-merging -fstrict-aliasing @gol +-fstdarg-opt -fstore-merging -fstrict-aliasing -fipa-strict-aliasing @gol -fthread-jumps -ftracer -ftree-bit-ccp @gol -ftree-builtin-call-dce -ftree-ccp -ftree-ch @gol -ftree-coalesce-vars -ftree-copy-prop -ftree-dce -ftree-dominator-opts @gol @@ -12423,6 +12423,16 @@ int f() @{ The @option{-fstrict-aliasing} option is enabled at levels @option{-O2}, @option{-O3}, @option{-Os}. +@item -fipa-strict-aliasing +@opindex fipa-strict-aliasing +Constrols whether rules of @option{-fstrict-aliasing} are applied across +function boundaries. Note that if multiple functions gets inlined into a +signle function the memory accesses are no longer considred to be crossing a +function bounday. + +The @option{-fipa-strict-aliasing} option is enabled by default and is +effective only in combination with @option{-fstrict-aliasing}. + @item -falign-functions @itemx -falign-functions=@var{n} @itemx -falign-functions=@var{n}:@var{m} diff --git a/gcc/ipa-modref.c b/gcc/ipa-modref.c index 2c89c63..d6bd9d3 100644 --- a/gcc/ipa-modref.c +++ b/gcc/ipa-modref.c @@ -999,9 +999,11 @@ modref_access_analysis::record_access (modref_records *tt, ao_ref *ref, modref_access_node &a) { - alias_set_type base_set = !flag_strict_aliasing ? 0 + alias_set_type base_set = !flag_strict_aliasing + || !flag_ipa_strict_aliasing ? 0 : ao_ref_base_alias_set (ref); - alias_set_type ref_set = !flag_strict_aliasing ? 0 + alias_set_type ref_set = !flag_strict_aliasing + || !flag_ipa_strict_aliasing ? 0 : (ao_ref_alias_set (ref)); if (dump_file) { @@ -1021,7 +1023,7 @@ modref_access_analysis::record_access_lto (modref_records_lto *tt, ao_ref *ref, /* get_alias_set sometimes use different type to compute the alias set than TREE_TYPE (base). Do same adjustments. */ tree base_type = NULL_TREE, ref_type = NULL_TREE; - if (flag_strict_aliasing) + if (flag_strict_aliasing && flag_ipa_strict_aliasing) { tree base; |