diff mbox series

[SUBREG,V3,1/4] DF: Add -ftrack-subreg-liveness option

Message ID 20240511131413.3394912-2-juzhe.zhong@rivai.ai
State New
Headers show
Series Add DF_LIVE_SUBREG data and apply to IRA and LRA | expand

Commit Message

juzhe.zhong@rivai.ai May 11, 2024, 1:14 p.m. UTC 
Add new flag -ftrack-subreg-liveness to enable track-subreg-liveness.
This flag is enabled at -O3/fast.

Co-authored-by: Lehua Ding <lehua.ding@rivai.ai>

gcc/ChangeLog:

        * common.opt: Add -ftrack-subreg-liveness option.
        * common.opt.urls: Ditto.
        * doc/invoke.texi: Ditto.
        * opts.cc: Ditto.

---
 gcc/common.opt      | 4 ++++
 gcc/common.opt.urls | 3 +++
 gcc/doc/invoke.texi | 8 ++++++++
 gcc/opts.cc         | 1 +
 4 files changed, 16 insertions(+)
diff mbox series

Patch

diff --git a/gcc/common.opt b/gcc/common.opt
index 40cab3cb36a..5710e817abe 100644
--- a/gcc/common.opt
+++ b/gcc/common.opt
@@ -2163,6 +2163,10 @@  fira-share-spill-slots
 Common Var(flag_ira_share_spill_slots) Init(1) Optimization
 Share stack slots for spilled pseudo-registers.
 
+ftrack-subreg-liveness
+Common Var(flag_track_subreg_liveness) Init(0) Optimization
+Track subreg liveness information.
+
 fira-verbose=
 Common RejectNegative Joined UInteger Var(flag_ira_verbose) Init(5)
 -fira-verbose=<number>	Control IRA's level of diagnostic messages.
diff --git a/gcc/common.opt.urls b/gcc/common.opt.urls
index f71ed80a34b..59f27a6f7c6 100644
--- a/gcc/common.opt.urls
+++ b/gcc/common.opt.urls
@@ -880,6 +880,9 @@  UrlSuffix(gcc/Optimize-Options.html#index-fira-share-save-slots)
 fira-share-spill-slots
 UrlSuffix(gcc/Optimize-Options.html#index-fira-share-spill-slots)
 
+ftrack-subreg-liveness
+UrlSuffix(gcc/Optimize-Options.html#index-ftrack-subreg-liveness)
+
 fira-verbose=
 UrlSuffix(gcc/Developer-Options.html#index-fira-verbose)
 
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index ddcd5213f06..fbcde8aa745 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -13188,6 +13188,14 @@  Disable sharing of stack slots allocated for pseudo-registers.  Each
 pseudo-register that does not get a hard register gets a separate
 stack slot, and as a result function stack frames are larger.
 
+@opindex ftrack-subreg-liveness
+@item -ftrack-subreg-liveness
+Enable tracking subreg liveness information. This infomation allows IRA
+and LRA to support subreg coalesce feature which can improve the quality
+of register allocation.
+
+This option is enabled at level @option{-O3} for all targets.
+
 @opindex flra-remat
 @item -flra-remat
 Enable CFG-sensitive rematerialization in LRA.  Instead of loading
diff --git a/gcc/opts.cc b/gcc/opts.cc
index 3333600e0ea..50c0b62c5af 100644
--- a/gcc/opts.cc
+++ b/gcc/opts.cc
@@ -689,6 +689,7 @@  static const struct default_options default_options_table[] =
     { OPT_LEVELS_3_PLUS, OPT_funswitch_loops, NULL, 1 },
     { OPT_LEVELS_3_PLUS, OPT_fvect_cost_model_, NULL, VECT_COST_MODEL_DYNAMIC },
     { OPT_LEVELS_3_PLUS, OPT_fversion_loops_for_strides, NULL, 1 },
+    { OPT_LEVELS_3_PLUS, OPT_ftrack_subreg_liveness, NULL, 1 },
 
     /* -O3 parameters.  */
     { OPT_LEVELS_3_PLUS, OPT__param_max_inline_insns_auto_, NULL, 30 },