arm: Add support for Arm Cortex-M52 CPU.

This patch adds the -mcpu support for the Arm Cortex-M52 CPU which is
an Armv8.1-M Mainline CPU supporting MVE and PACBTI by default.

-mcpu=cortex-m52 switch by default matches to -march=armv8.1-m.main+pacbti+mve.fp+fp.dp.

The cde feature is supported by specifying +cdecpN (e.g. -mcpu=cortex-m52+cdecp<N>),
where N is the coprocessor number 0 to 7.

Also following options are provided to disable default features.
+nomve.fp (disables MVE Floating point)
+nomve (disables MVE Integer and MVE Floating point)
+nodsp (disables dsp, MVE Integer and MVE Floating point)
+nopacbti (disables pacbti)
+nofp (disables floating point and MVE floating point)

Signed-off-by: Chung-Ju Wu <jasonwucj@gmail.com>

gcc/ChangeLog:

	* config/arm/arm-cpus.in (cortex-m52): New cpu.
	* config/arm/arm-tables.opt: Regenerate.
	* config/arm/arm-tune.md: Regenerate.

3 files changed, 27 insertions, 3 deletions

diff --git a/gcc/config/arm/arm-cpus.in b/gcc/config/arm/arm-cpus.in
index 6fa7e31..451b15f 100644
--- a/gcc/config/arm/arm-cpus.in
+++ b/gcc/config/arm/arm-cpus.in
@@ -1641,6 +1641,27 @@ begin cpu cortex-m35p
  costs v7m
 end cpu cortex-m35p
 
+begin cpu cortex-m52
+ cname cortexm52
+ tune flags LDSCHED
+ architecture armv8.1-m.main+pacbti+mve.fp+fp.dp
+ option nopacbti remove pacbti
+ option nomve.fp remove mve_float
+ option nomve remove mve mve_float
+ option nofp remove ALL_FP mve_float
+ option nodsp remove MVE mve_float
+ option cdecp0 add cdecp0
+ option cdecp1 add cdecp1
+ option cdecp2 add cdecp2
+ option cdecp3 add cdecp3
+ option cdecp4 add cdecp4
+ option cdecp5 add cdecp5
+ option cdecp6 add cdecp6
+ option cdecp7 add cdecp7
+ isa quirk_no_asmcpu quirk_vlldm
+ costs v7m
+end cpu cortex-m52
+
 begin cpu cortex-m55
  cname cortexm55
  tune flags LDSCHED
diff --git a/gcc/config/arm/arm-tables.opt b/gcc/config/arm/arm-tables.opt
index 9d6ae87..d3eb9a9 100644
--- a/gcc/config/arm/arm-tables.opt
+++ b/gcc/config/arm/arm-tables.opt
@@ -283,6 +283,9 @@ EnumValue
 Enum(processor_type) String(cortex-m35p) Value( TARGET_CPU_cortexm35p)
 
 EnumValue
+Enum(processor_type) String(cortex-m52) Value( TARGET_CPU_cortexm52)
+
+EnumValue
 Enum(processor_type) String(cortex-m55) Value( TARGET_CPU_cortexm55)
 
 EnumValue
diff --git a/gcc/config/arm/arm-tune.md b/gcc/config/arm/arm-tune.md
index 7318f03..6a631d8 100644
--- a/gcc/config/arm/arm-tune.md
+++ b/gcc/config/arm/arm-tune.md
@@ -49,7 +49,7 @@
 	cortexa710,cortexx1,cortexx1c,
 	neoversen1,cortexa75cortexa55,cortexa76cortexa55,
 	neoversev1,neoversen2,cortexm23,
-	cortexm33,cortexm35p,cortexm55,
-	starmc1,cortexm85,cortexr52,
-	cortexr52plus"
+	cortexm33,cortexm35p,cortexm52,
+	cortexm55,starmc1,cortexm85,
+	cortexr52,cortexr52plus"
 	(const (symbol_ref "((enum attr_tune) arm_tune)")))