Add new flag -ftrack-subreg-liveness to enable track-subreg-liveness.
This flag is enabled at -O3/fast.
gcc/ChangeLog:
* common.opt: add -ftrack-subreg-liveness option.
* opts.cc: auto aneble -ftrack-subreg-liveness in -O3/fast
---
gcc/common.opt | 4 ++++
gcc/opts.cc | 1 +
2 files changed, 5 insertions(+)
diff --git a/gcc/common.opt b/gcc/common.opt
index 51c4a17da83..d4592c6426a 100644
--- a/gcc/common.opt
+++ b/gcc/common.opt
@@ -2156,6 +2156,10 @@ fira-verbose=
Common RejectNegative Joined UInteger Var(flag_ira_verbose) Init(5)
-fira-verbose=<number> Control IRA's level of diagnostic messages.
+ftrack-subreg-liveness
+Common Var(flag_track_subreg_liveness) Init(0) Optimization
+Track subreg liveness information for IRA and LRA, enabled at -O3.
+
fivopts
Common Var(flag_ivopts) Init(1) Optimization
Optimize induction variables on trees.
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 },
--
2.36.3
