FreeChainXenon/gcc
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

RISC-V: Add optim-no-fusion compile option [VSETVL PASS]

Browse source 
This patch adds no fusion compile option to disable phase 2 global fusion.

It can help us to analyze the compile-time and debugging.

Committed.

gcc/ChangeLog:

	* config/riscv/riscv-opts.h (enum vsetvl_strategy_enum): Add optim-no-fusion option.
	* config/riscv/riscv-vsetvl.cc (pass_vsetvl::lazy_vsetvl): Ditto.
	(pass_vsetvl::execute): Ditto.
	* config/riscv/riscv.opt: Ditto.
This commit is contained in:
Juzhe-Zhong 2024-01-25 15:55:39 +08:00 • committed by Pan Li
parent 77159546b2
commit 1a8bebb1c5
3 changed files with 21 additions and 14 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

8
gcc/config/riscv/riscv-opts.h
View file

@ -118,11 +118,13 @@ enum stringop_strategy_enum {
/* Behavior of VSETVL Pass. */
enum vsetvl_strategy_enum {
/* Simple: Insert a vsetvl* instruction for each Vector instruction. */
VSETVL_SIMPLE = 1,
/* Optimized: Run LCM dataflow analysis to reduce vsetvl* insns and
delete any redundant ones generated in the process. */
VSETVL_OPT = 2
VSETVL_OPT,
/* Simple: Insert a vsetvl* instruction for each Vector instruction. */
VSETVL_SIMPLE,
/* No fusion: Disable Phase 2 earliest global fusion. */
VSETVL_OPT_NO_FUSION,
};
#define TARGET_ZICOND_LIKE (TARGET_ZICOND || (TARGET_XVENTANACONDOPS && TARGET_64BIT))

22
gcc/config/riscv/riscv-vsetvl.cc
View file

@ -3495,16 +3495,18 @@ pass_vsetvl::lazy_vsetvl ()
/* Phase 2: Fuse header and footer vsetvl infos between basic blocks. */
if (dump_file)
fprintf (dump_file, "\nPhase 2: Lift up vsetvl info.\n\n");
bool changed;
int fused_count = 0;
do
if (vsetvl_strategy != VSETVL_OPT_NO_FUSION)
{
if (dump_file)
fprintf (dump_file, " Try lift up %d.\n\n", fused_count);
changed = pre.earliest_fuse_vsetvl_info (fused_count);
fused_count += 1;
} while (changed);
bool changed = true;
int fused_count = 0;
do
{
if (dump_file)
fprintf (dump_file, " Try lift up %d.\n\n", fused_count);
changed = pre.earliest_fuse_vsetvl_info (fused_count);
fused_count += 1;
} while (changed);
}
if (dump_file && (dump_flags & TDF_DETAILS))
pre.dump (dump_file, "phase 2");
@ -3545,7 +3547,7 @@ pass_vsetvl::execute (function *)
if (!has_vector_insn (cfun))
return 0;
if (!optimize || vsetvl_strategy & VSETVL_SIMPLE)
if (!optimize || vsetvl_strategy == VSETVL_SIMPLE)
simple_vsetvl ();
else
lazy_vsetvl ();

5
gcc/config/riscv/riscv.opt
View file

@ -552,11 +552,14 @@ Enum
Name(vsetvl_strategy) Type(enum vsetvl_strategy_enum)
Valid arguments to -param=vsetvl-strategy=:
EnumValue
Enum(vsetvl_strategy) String(optim) Value(VSETVL_OPT)
EnumValue
Enum(vsetvl_strategy) String(simple) Value(VSETVL_SIMPLE)
EnumValue
Enum(vsetvl_strategy) String(optim) Value(VSETVL_OPT)
Enum(vsetvl_strategy) String(optim-no-fusion) Value(VSETVL_OPT_NO_FUSION)
-param=vsetvl-strategy=
Target Undocumented RejectNegative Joined Enum(vsetvl_strategy) Var(vsetvl_strategy) Init(VSETVL_OPT)