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| author | Segher Boessenkool <segher@kernel.crashing.org> | 2015-10-01 08:38:24 +0200 |
|---|---|---|
| committer | Segher Boessenkool <segher@gcc.gnu.org> | 2015-10-01 08:38:24 +0200 |
| commit | 59faab7cc48681d8b2c995bdc466e1f3262839fa (patch) | |
| tree | a8576e110feff8492232a921cc8f8c525d14265c /gcc/common.opt | |
| parent | 248c16c49ac74146a3b21f7536ede9b0f4378493 (diff) | |
| download | gcc-59faab7cc48681d8b2c995bdc466e1f3262839fa.tar.gz | |
bb-reorder: Add -freorder-blocks-algorithm= and wire it up
This adds an -freorder-blocks-algorithm=[simple|stc] flag, with "simple"
as default. For -O2 and up (except -Os) it is switched to "stc" instead.
Targets that never want STC can override this. This changes -freorder-blocks
to be on at -O1 and up (was -O2 and up).
In effect, the changes are for -O1 (which now gets "simple" instead of
nothing), -Os (which now gets "simple" instead of "stc", since STC results
in much bigger code), and for targets that wish to never use STC (not in
this patch though).
2015-09-23 Segher Boessenkool <segher@kernel.crashing.org>
* bb-reorder.c (reorder_basic_blocks): Use the algorithm selected
with flag_reorder_blocks_algorithm.
* common.opt (freorder-blocks-algorithm=): New flag.
(reorder_blocks_algorithm): New enum.
* flag-types.h (reorder_blocks_algorithm): New enum.
* opts.c (default_options_table): Use -freorder-blocks at -O1 and up,
and -freorder-blocks-algorithm=stc at -O2 and up (not at -Os).
From-SVN: r228318
Diffstat (limited to 'gcc/common.opt')
| -rw-r--r-- | gcc/common.opt | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/gcc/common.opt b/gcc/common.opt index 94d1d884833..b0f70fb4e9e 100644 --- a/gcc/common.opt +++ b/gcc/common.opt @@ -1910,6 +1910,19 @@ freorder-blocks Common Report Var(flag_reorder_blocks) Optimization Reorder basic blocks to improve code placement +freorder-blocks-algorithm= +Common Joined RejectNegative Enum(reorder_blocks_algorithm) Var(flag_reorder_blocks_algorithm) Init(REORDER_BLOCKS_ALGORITHM_SIMPLE) Optimization +-freorder-blocks-algorithm=[simple|stc] Set the used basic block reordering algorithm + +Enum +Name(reorder_blocks_algorithm) Type(enum reorder_blocks_algorithm) UnknownError(unknown basic block reordering algorithm %qs) + +EnumValue +Enum(reorder_blocks_algorithm) String(simple) Value(REORDER_BLOCKS_ALGORITHM_SIMPLE) + +EnumValue +Enum(reorder_blocks_algorithm) String(stc) Value(REORDER_BLOCKS_ALGORITHM_STC) + freorder-blocks-and-partition Common Report Var(flag_reorder_blocks_and_partition) Optimization Reorder basic blocks and partition into hot and cold sections |