* [PATCH v2] xtensa: Make full transition to LRA
@ 2024-01-24 5:15 Max Filippov
0 siblings, 0 replies; 3+ messages in thread
From: Max Filippov @ 2024-01-24 5:15 UTC (permalink / raw)
To: gcc-patches; +Cc: Takayuki 'January June' Suwa
From: Takayuki 'January June' Suwa <jjsuwa_sys3175@yahoo.co.jp>
gcc/ChangeLog:
* config/xtensa/constraints.md (R, T, U):
Change define_constraint to define_memory_constraint.
* config/xtensa/predicates.md (move_operand): Don't check that a
constant pool operand size is a multiple of UNITS_PER_WORD.
* config/xtensa/xtensa.cc
(xtensa_lra_p, TARGET_LRA_P): Remove.
(xtensa_emit_move_sequence): Remove "if (reload_in_progress)"
clause as it can no longer be true.
(fixup_subreg_mem): Drop function.
(xtensa_output_integer_literal_parts): Consider 16-bit wide
constants.
(xtensa_legitimate_constant_p): Add short-circuit path for
integer load instructions. Don't check that mode size is
at least UNITS_PER_WORD.
* config/xtensa/xtensa.md (movsf): Use can_create_pseudo_p()
rather reload_in_progress and reload_completed.
(doloop_end): Drop operand 2.
(movhi_internal): Add alternative loading constant from a
literal pool.
* config/xtensa/xtensa.opt (mlra): Change to no effect.
---
gcc/config/xtensa/constraints.md | 26 ++++++------------
gcc/config/xtensa/predicates.md | 4 +--
gcc/config/xtensa/xtensa.cc | 46 +++++---------------------------
gcc/config/xtensa/xtensa.md | 15 +++++------
gcc/config/xtensa/xtensa.opt | 4 +--
5 files changed, 24 insertions(+), 71 deletions(-)
diff --git a/gcc/config/xtensa/constraints.md b/gcc/config/xtensa/constraints.md
index 5cade1db8ff1..dc6ffb5ba15c 100644
--- a/gcc/config/xtensa/constraints.md
+++ b/gcc/config/xtensa/constraints.md
@@ -123,29 +123,19 @@
(and (match_code "const_int")
(match_test "! xtensa_split1_finished_p ()"))))
-;; Memory constraints. Do not use define_memory_constraint here. Doing so
-;; causes reload to force some constants into the constant pool, but since
-;; the Xtensa constant pool can only be accessed with L32R instructions, it
-;; is always better to just copy a constant into a register. Instead, use
-;; regular constraints but add a check to allow pseudos during reload.
+;; Memory constraints.
-(define_constraint "R"
+(define_memory_constraint "R"
"Memory that can be accessed with a 4-bit unsigned offset from a register."
- (ior (and (match_code "mem")
- (match_test "smalloffset_mem_p (op)"))
- (and (match_code "reg")
- (match_test "reload_in_progress
- && REGNO (op) >= FIRST_PSEUDO_REGISTER"))))
+ (and (match_code "mem")
+ (match_test "smalloffset_mem_p (op)")))
-(define_constraint "T"
+(define_memory_constraint "T"
"Memory in a literal pool (addressable with an L32R instruction)."
(and (match_code "mem")
(match_test "!TARGET_CONST16 && constantpool_mem_p (op)")))
-(define_constraint "U"
+(define_memory_constraint "U"
"Memory that is not in a literal pool."
- (ior (and (match_code "mem")
- (match_test "! constantpool_mem_p (op)"))
- (and (match_code "reg")
- (match_test "reload_in_progress
- && REGNO (op) >= FIRST_PSEUDO_REGISTER"))))
+ (and (match_code "mem")
+ (match_test "! constantpool_mem_p (op)")))
diff --git a/gcc/config/xtensa/predicates.md b/gcc/config/xtensa/predicates.md
index 672fb003a6c5..dd77911e3b70 100644
--- a/gcc/config/xtensa/predicates.md
+++ b/gcc/config/xtensa/predicates.md
@@ -143,9 +143,7 @@
(define_predicate "move_operand"
(ior
(ior (match_operand 0 "register_operand")
- (and (match_operand 0 "memory_operand")
- (match_test "!constantpool_mem_p (op)
- || GET_MODE_SIZE (mode) % UNITS_PER_WORD == 0")))
+ (match_operand 0 "memory_operand"))
(ior (and (match_code "const_int")
(match_test "(GET_MODE_CLASS (mode) == MODE_INT
&& xtensa_simm12b (INTVAL (op)))
diff --git a/gcc/config/xtensa/xtensa.cc b/gcc/config/xtensa/xtensa.cc
index a4f8e3e49d06..22b4416f48e4 100644
--- a/gcc/config/xtensa/xtensa.cc
+++ b/gcc/config/xtensa/xtensa.cc
@@ -115,7 +115,6 @@ static enum internal_test map_test_to_internal_test (enum rtx_code);
static rtx gen_int_relational (enum rtx_code, rtx, rtx);
static rtx gen_float_relational (enum rtx_code, rtx, rtx);
static rtx gen_conditional_move (enum rtx_code, machine_mode, rtx, rtx);
-static rtx fixup_subreg_mem (rtx);
static struct machine_function * xtensa_init_machine_status (void);
static rtx xtensa_legitimize_tls_address (rtx);
static rtx xtensa_legitimize_address (rtx, rtx, machine_mode);
@@ -192,7 +191,6 @@ static void xtensa_output_mi_thunk (FILE *file, tree thunk ATTRIBUTE_UNUSED,
HOST_WIDE_INT delta,
HOST_WIDE_INT vcall_offset,
tree function);
-static bool xtensa_lra_p (void);
static rtx xtensa_delegitimize_address (rtx);
@@ -286,9 +284,6 @@ static rtx xtensa_delegitimize_address (rtx);
#undef TARGET_CANNOT_FORCE_CONST_MEM
#define TARGET_CANNOT_FORCE_CONST_MEM xtensa_cannot_force_const_mem
-#undef TARGET_LRA_P
-#define TARGET_LRA_P xtensa_lra_p
-
#undef TARGET_LEGITIMATE_ADDRESS_P
#define TARGET_LEGITIMATE_ADDRESS_P xtensa_legitimate_address_p
@@ -1333,35 +1328,10 @@ xtensa_emit_move_sequence (rtx *operands, machine_mode mode)
operands[1] = xtensa_copy_incoming_a7 (operands[1]);
- /* During reload we don't want to emit (subreg:X (mem:Y)) since that
- instruction won't be recognized after reload, so we remove the
- subreg and adjust mem accordingly. */
- if (reload_in_progress)
- {
- operands[0] = fixup_subreg_mem (operands[0]);
- operands[1] = fixup_subreg_mem (operands[1]);
- }
return 0;
}
-static rtx
-fixup_subreg_mem (rtx x)
-{
- if (GET_CODE (x) == SUBREG
- && GET_CODE (SUBREG_REG (x)) == REG
- && REGNO (SUBREG_REG (x)) >= FIRST_PSEUDO_REGISTER)
- {
- rtx temp =
- gen_rtx_SUBREG (GET_MODE (x),
- reg_equiv_mem (REGNO (SUBREG_REG (x))),
- SUBREG_BYTE (x));
- x = alter_subreg (&temp, true);
- }
- return x;
-}
-
-
/* Check if an incoming argument in a7 is expected to be used soon and
if OPND is a register or register pair that includes a7. If so,
create a new pseudo and copy a7 into that pseudo at the very
@@ -2355,7 +2325,7 @@ xtensa_legitimate_address_p (machine_mode mode, rtx addr, bool strict,
code_helper)
{
/* Allow constant pool addresses. */
- if (mode != BLKmode && GET_MODE_SIZE (mode) >= UNITS_PER_WORD
+ if (mode != BLKmode
&& ! TARGET_CONST16 && constantpool_address_p (addr)
&& ! xtensa_tls_referenced_p (addr))
return true;
@@ -3280,7 +3250,7 @@ xtensa_output_integer_literal_parts (FILE *file, rtx x, int size)
fputs (", ", file);
xtensa_output_integer_literal_parts (file, second, size / 2);
}
- else if (size == 4)
+ else if (size == 4 || size == 2)
{
output_addr_const (file, x);
}
@@ -4952,6 +4922,10 @@ xtensa_trampoline_init (rtx m_tramp, tree fndecl, rtx chain)
static bool
xtensa_legitimate_constant_p (machine_mode mode ATTRIBUTE_UNUSED, rtx x)
{
+ if (CONST_INT_P (x))
+ return TARGET_AUTO_LITPOOLS || TARGET_CONST16
+ || xtensa_simm12b (INTVAL (x));
+
return !xtensa_tls_referenced_p (x);
}
@@ -5393,12 +5367,4 @@ xtensa_delegitimize_address (rtx op)
return op;
}
-/* Implement TARGET_LRA_P. */
-
-static bool
-xtensa_lra_p (void)
-{
- return TARGET_LRA;
-}
-
#include "gt-xtensa.h"
diff --git a/gcc/config/xtensa/xtensa.md b/gcc/config/xtensa/xtensa.md
index 20af1cbfbd03..184b44e45f49 100644
--- a/gcc/config/xtensa/xtensa.md
+++ b/gcc/config/xtensa/xtensa.md
@@ -1328,8 +1328,8 @@
})
(define_insn "movhi_internal"
- [(set (match_operand:HI 0 "nonimmed_operand" "=D,D,a,a,a,a,U,*a,*A")
- (match_operand:HI 1 "move_operand" "M,d,r,I,Y,U,r,*A,*r"))]
+ [(set (match_operand:HI 0 "nonimmed_operand" "=D,D,a,a,a,a,a,U,*a,*A")
+ (match_operand:HI 1 "move_operand" "M,d,r,I,Y,T,U,r,*A,*r"))]
"xtensa_valid_move (HImode, operands)"
"@
movi.n\t%0, %x1
@@ -1337,13 +1337,14 @@
mov\t%0, %1
movi\t%0, %x1
movi\t%0, %1
+ %v1l32r\t%0, %1
%v1l16ui\t%0, %1
%v0s16i\t%1, %0
rsr\t%0, ACCLO
wsr\t%1, ACCLO"
- [(set_attr "type" "move,move,move,move,move,load,store,rsr,wsr")
+ [(set_attr "type" "move,move,move,move,move,load,load,store,rsr,wsr")
(set_attr "mode" "HI")
- (set_attr "length" "2,2,3,3,3,3,3,3,3")])
+ (set_attr "length" "2,2,3,3,3,3,3,3,3,3")])
;; 8-bit Integer moves
@@ -1420,7 +1421,7 @@
if ((!register_operand (operands[0], SFmode)
&& !register_operand (operands[1], SFmode))
|| (FP_REG_P (xt_true_regnum (operands[0]))
- && !(reload_in_progress | reload_completed)
+ && can_create_pseudo_p ()
&& (constantpool_mem_p (operands[1])
|| CONSTANT_P (operands[1]))))
operands[1] = force_reg (SFmode, operands[1]);
@@ -2368,14 +2369,12 @@
(set (match_dup 0)
(plus:SI (match_dup 0)
(const_int -1)))
- (unspec [(const_int 0)] UNSPEC_LSETUP_END)
- (clobber (match_dup 2))])] ; match_scratch
+ (unspec [(const_int 0)] UNSPEC_LSETUP_END)])]
"TARGET_LOOPS && optimize"
{
/* The loop optimizer doesn't check the predicates... */
if (GET_MODE (operands[0]) != SImode)
FAIL;
- operands[2] = gen_rtx_SCRATCH (SImode);
})
\f
diff --git a/gcc/config/xtensa/xtensa.opt b/gcc/config/xtensa/xtensa.opt
index f16b53bf409f..19c9bd37a187 100644
--- a/gcc/config/xtensa/xtensa.opt
+++ b/gcc/config/xtensa/xtensa.opt
@@ -38,8 +38,8 @@ Target RejectNegative Joined UInteger Var(xtensa_extra_l32r_costs) Init(0)
Set extra memory access cost for L32R instruction, in clock-cycle units.
mlra
-Target Mask(LRA)
-Use LRA instead of reload (transitional).
+Target Ignore
+Does nothing. Preserved for backward compatibility.
mtarget-align
Target
--
2.39.2
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH v2] xtensa: Make full transition to LRA
2023-05-08 14:44 ` [PATCH v2] " Takayuki 'January June' Suwa
@ 2023-05-08 22:26 ` Jeff Law
0 siblings, 0 replies; 3+ messages in thread
From: Jeff Law @ 2023-05-08 22:26 UTC (permalink / raw)
To: Takayuki 'January June' Suwa, Richard Biener, GCC Patches
Cc: Max Filippov
On 5/8/23 08:44, Takayuki 'January June' Suwa via Gcc-patches wrote:
> On 2023/05/08 22:43, Richard Biener wrote:
> [snip]
>>> -mlra
>>
>> If they were in any released compiler options should be kept
>> (doing nothing) for backward compatibility. Use for example
>>
>> mlra
>> Target WarnRemoved
>> Removed in GCC 14. This switch has no effect.
>>
>> or
>>
>> mlra
>> Target Ignore
>> Does nothing. Preserved for backward compatibility.
>>
>> which doesn't inform the user (I think that's the better choice here).
>>
>>> -Target Mask(LRA)
> Thank you for your helpful advice.
>
> =====
> gcc/ChangeLog:
>
> * config/xtensa/constraints.md (R, T, U):
> Change define_constraint to define_memory_constraint.
> * config/xtensa/xtensa.cc
> (xtensa_lra_p, TARGET_LRA_P): Remove.
> (xtensa_emit_move_sequence): Remove "if (reload_in_progress)"
> clause as it can no longer be true.
> (xtensa_output_integer_literal_parts): Consider 16-bit wide
> constants.
> (xtensa_legitimate_constant_p): Add short-circuit path for
> integer load instructions.
> * config/xtensa/xtensa.md (movsf): Use can_create_pseudo_p()
> rather reload_in_progress and reload_completed.
> * config/xtensa/xtensa.opt (mlra): Change to no effect.
> ---
> gcc/config/xtensa/constraints.md | 26 ++++++++------------------
> gcc/config/xtensa/xtensa.cc | 26 +++++---------------------
> gcc/config/xtensa/xtensa.md | 2 +-
> gcc/config/xtensa/xtensa.opt | 4 ++--
> 4 files changed, 16 insertions(+), 42 deletions(-)
>
> diff --git a/gcc/config/xtensa/constraints.md b/gcc/config/xtensa/constraints.md
> index 53e4d0d8dd1..9b31e162941 100644
> --- a/gcc/config/xtensa/constraints.md
> +++ b/gcc/config/xtensa/constraints.md
> @@ -123,29 +123,19 @@
> (and (match_code "const_int")
> (match_test "! xtensa_split1_finished_p ()"))))
>
> -;; Memory constraints. Do not use define_memory_constraint here. Doing so
> -;; causes reload to force some constants into the constant pool, but since
> -;; the Xtensa constant pool can only be accessed with L32R instructions, it
> -;; is always better to just copy a constant into a register. Instead, use
> -;; regular constraints but add a check to allow pseudos during reload.
> +;; Memory constraints.
>
> -(define_constraint "R"
> +(define_memory_constraint "R"
> "Memory that can be accessed with a 4-bit unsigned offset from a register."
> - (ior (and (match_code "mem")
> - (match_test "smalloffset_mem_p (op)"))
> - (and (match_code "reg")
> - (match_test "reload_in_progress
> - && REGNO (op) >= FIRST_PSEUDO_REGISTER"))))
> + (and (match_code "mem")
> + (match_test "smalloffset_mem_p (op)")))
>
> -(define_constraint "T"
> +(define_memory_constraint "T"
> "Memory in a literal pool (addressable with an L32R instruction)."
> (and (match_code "mem")
> (match_test "!TARGET_CONST16 && constantpool_mem_p (op)")))
>
> -(define_constraint "U"
> +(define_memory_constraint "U"
> "Memory that is not in a literal pool."
> - (ior (and (match_code "mem")
> - (match_test "! constantpool_mem_p (op)"))
> - (and (match_code "reg")
> - (match_test "reload_in_progress
> - && REGNO (op) >= FIRST_PSEUDO_REGISTER"))))
> + (and (match_code "mem")
> + (match_test "! constantpool_mem_p (op)")))
Given the old comment, you might want to use
define_special_memory_constraint rather than define_memory_constraint.
It might be worth doing some before/after comparisons to see if there's
any noticeable impact.
jeff
^ permalink raw reply [flat|nested] 3+ messages in thread
* [PATCH v2] xtensa: Make full transition to LRA
2023-05-08 13:43 ` Richard Biener
@ 2023-05-08 14:44 ` Takayuki 'January June' Suwa
2023-05-08 22:26 ` Jeff Law
0 siblings, 1 reply; 3+ messages in thread
From: Takayuki 'January June' Suwa @ 2023-05-08 14:44 UTC (permalink / raw)
To: Richard Biener, GCC Patches; +Cc: Max Filippov
On 2023/05/08 22:43, Richard Biener wrote:
[snip]
>> -mlra
>
> If they were in any released compiler options should be kept
> (doing nothing) for backward compatibility. Use for example
>
> mlra
> Target WarnRemoved
> Removed in GCC 14. This switch has no effect.
>
> or
>
> mlra
> Target Ignore
> Does nothing. Preserved for backward compatibility.
>
> which doesn't inform the user (I think that's the better choice here).
>
>> -Target Mask(LRA)
Thank you for your helpful advice.
=====
gcc/ChangeLog:
* config/xtensa/constraints.md (R, T, U):
Change define_constraint to define_memory_constraint.
* config/xtensa/xtensa.cc
(xtensa_lra_p, TARGET_LRA_P): Remove.
(xtensa_emit_move_sequence): Remove "if (reload_in_progress)"
clause as it can no longer be true.
(xtensa_output_integer_literal_parts): Consider 16-bit wide
constants.
(xtensa_legitimate_constant_p): Add short-circuit path for
integer load instructions.
* config/xtensa/xtensa.md (movsf): Use can_create_pseudo_p()
rather reload_in_progress and reload_completed.
* config/xtensa/xtensa.opt (mlra): Change to no effect.
---
gcc/config/xtensa/constraints.md | 26 ++++++++------------------
gcc/config/xtensa/xtensa.cc | 26 +++++---------------------
gcc/config/xtensa/xtensa.md | 2 +-
gcc/config/xtensa/xtensa.opt | 4 ++--
4 files changed, 16 insertions(+), 42 deletions(-)
diff --git a/gcc/config/xtensa/constraints.md b/gcc/config/xtensa/constraints.md
index 53e4d0d8dd1..9b31e162941 100644
--- a/gcc/config/xtensa/constraints.md
+++ b/gcc/config/xtensa/constraints.md
@@ -123,29 +123,19 @@
(and (match_code "const_int")
(match_test "! xtensa_split1_finished_p ()"))))
-;; Memory constraints. Do not use define_memory_constraint here. Doing so
-;; causes reload to force some constants into the constant pool, but since
-;; the Xtensa constant pool can only be accessed with L32R instructions, it
-;; is always better to just copy a constant into a register. Instead, use
-;; regular constraints but add a check to allow pseudos during reload.
+;; Memory constraints.
-(define_constraint "R"
+(define_memory_constraint "R"
"Memory that can be accessed with a 4-bit unsigned offset from a register."
- (ior (and (match_code "mem")
- (match_test "smalloffset_mem_p (op)"))
- (and (match_code "reg")
- (match_test "reload_in_progress
- && REGNO (op) >= FIRST_PSEUDO_REGISTER"))))
+ (and (match_code "mem")
+ (match_test "smalloffset_mem_p (op)")))
-(define_constraint "T"
+(define_memory_constraint "T"
"Memory in a literal pool (addressable with an L32R instruction)."
(and (match_code "mem")
(match_test "!TARGET_CONST16 && constantpool_mem_p (op)")))
-(define_constraint "U"
+(define_memory_constraint "U"
"Memory that is not in a literal pool."
- (ior (and (match_code "mem")
- (match_test "! constantpool_mem_p (op)"))
- (and (match_code "reg")
- (match_test "reload_in_progress
- && REGNO (op) >= FIRST_PSEUDO_REGISTER"))))
+ (and (match_code "mem")
+ (match_test "! constantpool_mem_p (op)")))
diff --git a/gcc/config/xtensa/xtensa.cc b/gcc/config/xtensa/xtensa.cc
index 9e5d314e143..f4434ec6e2c 100644
--- a/gcc/config/xtensa/xtensa.cc
+++ b/gcc/config/xtensa/xtensa.cc
@@ -190,7 +190,6 @@ static void xtensa_output_mi_thunk (FILE *file, tree thunk ATTRIBUTE_UNUSED,
HOST_WIDE_INT delta,
HOST_WIDE_INT vcall_offset,
tree function);
-static bool xtensa_lra_p (void);
static rtx xtensa_delegitimize_address (rtx);
@@ -286,9 +285,6 @@ static rtx xtensa_delegitimize_address (rtx);
#undef TARGET_CANNOT_FORCE_CONST_MEM
#define TARGET_CANNOT_FORCE_CONST_MEM xtensa_cannot_force_const_mem
-#undef TARGET_LRA_P
-#define TARGET_LRA_P xtensa_lra_p
-
#undef TARGET_LEGITIMATE_ADDRESS_P
#define TARGET_LEGITIMATE_ADDRESS_P xtensa_legitimate_address_p
@@ -1266,14 +1262,6 @@ xtensa_emit_move_sequence (rtx *operands, machine_mode mode)
operands[1] = xtensa_copy_incoming_a7 (operands[1]);
- /* During reload we don't want to emit (subreg:X (mem:Y)) since that
- instruction won't be recognized after reload, so we remove the
- subreg and adjust mem accordingly. */
- if (reload_in_progress)
- {
- operands[0] = fixup_subreg_mem (operands[0]);
- operands[1] = fixup_subreg_mem (operands[1]);
- }
return 0;
}
@@ -3196,7 +3184,7 @@ xtensa_output_integer_literal_parts (FILE *file, rtx x, int size)
fputs (", ", file);
xtensa_output_integer_literal_parts (file, second, size / 2);
}
- else if (size == 4)
+ else if (size == 4 || size == 2)
{
output_addr_const (file, x);
}
@@ -4876,6 +4864,10 @@ xtensa_trampoline_init (rtx m_tramp, tree fndecl, rtx chain)
static bool
xtensa_legitimate_constant_p (machine_mode mode ATTRIBUTE_UNUSED, rtx x)
{
+ if (CONST_INT_P (x))
+ return TARGET_AUTO_LITPOOLS || TARGET_CONST16
+ || xtensa_simm12b (INTVAL (x));
+
return !xtensa_tls_referenced_p (x);
}
@@ -5317,12 +5309,4 @@ xtensa_delegitimize_address (rtx op)
return op;
}
-/* Implement TARGET_LRA_P. */
-
-static bool
-xtensa_lra_p (void)
-{
- return TARGET_LRA;
-}
-
#include "gt-xtensa.h"
diff --git a/gcc/config/xtensa/xtensa.md b/gcc/config/xtensa/xtensa.md
index 3521fa33b47..195515d9427 100644
--- a/gcc/config/xtensa/xtensa.md
+++ b/gcc/config/xtensa/xtensa.md
@@ -1268,7 +1268,7 @@
if ((!register_operand (operands[0], SFmode)
&& !register_operand (operands[1], SFmode))
|| (FP_REG_P (xt_true_regnum (operands[0]))
- && !(reload_in_progress | reload_completed)
+ && can_create_pseudo_p ()
&& (constantpool_mem_p (operands[1])
|| CONSTANT_P (operands[1]))))
operands[1] = force_reg (SFmode, operands[1]);
diff --git a/gcc/config/xtensa/xtensa.opt b/gcc/config/xtensa/xtensa.opt
index f16b53bf409..19c9bd37a18 100644
--- a/gcc/config/xtensa/xtensa.opt
+++ b/gcc/config/xtensa/xtensa.opt
@@ -38,8 +38,8 @@ Target RejectNegative Joined UInteger Var(xtensa_extra_l32r_costs) Init(0)
Set extra memory access cost for L32R instruction, in clock-cycle units.
mlra
-Target Mask(LRA)
-Use LRA instead of reload (transitional).
+Target Ignore
+Does nothing. Preserved for backward compatibility.
mtarget-align
Target
--
2.30.2
^ permalink raw reply [flat|nested] 3+ messages in thread
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2024-01-24 5:15 [PATCH v2] xtensa: Make full transition to LRA Max Filippov
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2023-05-08 13:38 ` [PATCH] " Takayuki 'January June' Suwa
2023-05-08 13:43 ` Richard Biener
2023-05-08 14:44 ` [PATCH v2] " Takayuki 'January June' Suwa
2023-05-08 22:26 ` Jeff Law
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