[PATCH 1/4] ARC: Add support for generic HS48 processor

Vineet Gupta
2021-01-15T20:04:18Z

For the HS48 processor, BR currently builds with -mcpu=hs4x_rel31 which
generates suboptimal code as it inhibits delay slot and back-back ST and so on.

Enable a new variant to build with -mcpu=hs4x for normal codegen.

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
---
arch/Config.in.arc | 16 +++++++++++-----
1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/arch/Config.in.arc b/arch/Config.in.arc
index fdfafda31c72..259d6f3ab8b9 100644
--- a/arch/Config.in.arc
+++ b/arch/Config.in.arc
@@ -39,9 +39,14 @@ config BR2_archs38_full

config BR2_archs4x_rel31
bool "ARC HS48 rel 31"
+ help
+ Build for HS48 release 3.1
+
+config BR2_archs4x
+ bool "ARC HS48"
help
Latest release of HS48 processor
- - Dual- and quad multiply and MC oprations
+ - Dual and Quad multiply and MAC operations
- Double-precision FPU

endchoice
@@ -49,7 +54,7 @@ endchoice
# Choice of atomic instructions presence
config BR2_ARC_ATOMIC_EXT
bool "Atomic extension (LLOCK/SCOND instructions)"
- default y if BR2_arc770d || BR2_archs38 || BR2_archs38_64mpy || BR2_archs38_full || BR2_archs4x_rel31
+ default y if BR2_arc770d || BR2_archs38 || BR2_archs38_64mpy || BR2_archs38_full || BR2_archs4x_rel31 || BR2_archs4x

config BR2_ARCH
default "arc" if BR2_arcle
@@ -70,10 +75,11 @@ config BR2_GCC_TARGET_CPU
default "hs38" if BR2_archs38_64mpy
default "hs38_linux" if BR2_archs38_full
default "hs4x_rel31" if BR2_archs4x_rel31
+ default "hs4x" if BR2_archs4x

config BR2_READELF_ARCH_NAME
default "ARCompact" if BR2_arc750d || BR2_arc770d
- default "ARCv2" if BR2_archs38 || BR2_archs38_64mpy || BR2_archs38_full || BR2_archs4x_rel31
+ default "ARCv2" if BR2_archs38 || BR2_archs38_64mpy || BR2_archs38_full || BR2_archs4x_rel31 || BR2_archs4x

choice
prompt "MMU Page Size"
@@ -93,7 +99,7 @@ choice

config BR2_ARC_PAGE_SIZE_4K
bool "4KB"
- depends on BR2_arc770d || BR2_archs38 || BR2_archs38_64mpy || BR2_archs38_full || BR2_archs4x_rel31
+ depends on BR2_arc770d || BR2_archs38 || BR2_archs38_64mpy || BR2_archs38_full || BR2_archs4x_rel31 || BR2_archs4x

config BR2_ARC_PAGE_SIZE_8K
bool "8KB"
@@ -103,7 +109,7 @@ config BR2_ARC_PAGE_SIZE_8K

config BR2_ARC_PAGE_SIZE_16K
bool "16KB"
- depends on BR2_arc770d || BR2_archs38 || BR2_archs38_64mpy || BR2_archs38_full || BR2_archs4x_rel31
+ depends on BR2_arc770d || BR2_archs38 || BR2_archs38_64mpy || BR2_archs38_full || BR2_archs4x_rel31 || BR2_archs4x

endchoice