RISC-V: Add minimal support for 7 new unprivileged extensions

The RISC-V Profiles specification here:
https://github.com/riscv/riscv-profiles/blob/main/profiles.adoc#7-new-isa-extensions

These extensions don't add any new features but
describe existing features. So this patch only adds parsing.

Za64rs: Reservation set size of 64 bytes
Za128rs: Reservation set size of 128 bytes
Ziccif: Main memory supports instruction fetch with atomicity requirement
Ziccrse: Main memory supports forward progress on LR/SC sequences
Ziccamoa: Main memory supports all atomics in A
Zicclsm: Main memory supports misaligned loads/stores
Zic64b: Cache block size isf 64 bytes

gcc/ChangeLog:

	* common/config/riscv/riscv-common.cc: Add Za64rs, Za128rs,
	Ziccif, Ziccrse, Ziccamoa, Zicclsm, Zic64b items.
	* config/riscv/riscv.opt: New macro for 7 new unprivileged
	extensions.
	* doc/invoke.texi (RISC-V Options): Add Za64rs, Za128rs,
	Ziccif, Ziccrse, Ziccamoa, Zicclsm, Zic64b extensions.
gcc/testsuite/ChangeLog:

	* gcc.target/riscv/za-ext.c: New test.
	* gcc.target/riscv/zi-ext.c: New test.

5 files changed, 102 insertions, 0 deletions

diff --git a/gcc/common/config/riscv/riscv-common.cc b/gcc/common/config/riscv/riscv-common.cc
index 6ac0422..631ce83 100644
--- a/gcc/common/config/riscv/riscv-common.cc
+++ b/gcc/common/config/riscv/riscv-common.cc
@@ -247,6 +247,8 @@ static const struct riscv_ext_version riscv_ext_version_table[] =
 
   {"zicond", ISA_SPEC_CLASS_NONE, 1, 0},
 
+  {"za64rs",  ISA_SPEC_CLASS_NONE, 1, 0},
+  {"za128rs", ISA_SPEC_CLASS_NONE, 1, 0},
   {"zawrs", ISA_SPEC_CLASS_NONE, 1, 0},
 
   {"zba", ISA_SPEC_CLASS_NONE, 1, 0},
@@ -276,6 +278,11 @@ static const struct riscv_ext_version riscv_ext_version_table[] =
   {"zicboz",ISA_SPEC_CLASS_NONE, 1, 0},
   {"zicbom",ISA_SPEC_CLASS_NONE, 1, 0},
   {"zicbop",ISA_SPEC_CLASS_NONE, 1, 0},
+  {"zic64b",   ISA_SPEC_CLASS_NONE, 1, 0},
+  {"ziccamoa", ISA_SPEC_CLASS_NONE, 1, 0},
+  {"ziccif",   ISA_SPEC_CLASS_NONE, 1, 0},
+  {"zicclsm",  ISA_SPEC_CLASS_NONE, 1, 0},
+  {"ziccrse",  ISA_SPEC_CLASS_NONE, 1, 0},
 
   {"zicntr", ISA_SPEC_CLASS_NONE, 2, 0},
   {"zihpm",  ISA_SPEC_CLASS_NONE, 2, 0},
@@ -1494,6 +1501,8 @@ static const riscv_ext_flag_table_t riscv_ext_flag_table[] =
   {"zifencei", &gcc_options::x_riscv_zi_subext, MASK_ZIFENCEI},
   {"zicond",   &gcc_options::x_riscv_zi_subext, MASK_ZICOND},
 
+  {"za64rs", &gcc_options::x_riscv_za_subext, MASK_ZA64RS},
+  {"za128rs", &gcc_options::x_riscv_za_subext, MASK_ZA128RS},
   {"zawrs", &gcc_options::x_riscv_za_subext, MASK_ZAWRS},
 
   {"zba",    &gcc_options::x_riscv_zb_subext, MASK_ZBA},
@@ -1523,6 +1532,11 @@ static const riscv_ext_flag_table_t riscv_ext_flag_table[] =
   {"zicboz", &gcc_options::x_riscv_zicmo_subext, MASK_ZICBOZ},
   {"zicbom", &gcc_options::x_riscv_zicmo_subext, MASK_ZICBOM},
   {"zicbop", &gcc_options::x_riscv_zicmo_subext, MASK_ZICBOP},
+  {"zic64b", &gcc_options::x_riscv_zicmo_subext, MASK_ZIC64B},
+  {"ziccamoa", &gcc_options::x_riscv_zicmo_subext, MASK_ZICCAMOA},
+  {"ziccif", &gcc_options::x_riscv_zicmo_subext, MASK_ZICCIF},
+  {"zicclsm", &gcc_options::x_riscv_zicmo_subext, MASK_ZICCLSM},
+  {"ziccrse", &gcc_options::x_riscv_zicmo_subext, MASK_ZICCRSE},
 
   {"zve32x",   &gcc_options::x_target_flags, MASK_VECTOR},
   {"zve32f",   &gcc_options::x_target_flags, MASK_VECTOR},
diff --git a/gcc/config/riscv/riscv.opt b/gcc/config/riscv/riscv.opt
index b6d8e9a..f6ff70b 100644
--- a/gcc/config/riscv/riscv.opt
+++ b/gcc/config/riscv/riscv.opt
@@ -225,11 +225,25 @@ Mask(ZIHINTPAUSE) Var(riscv_zi_subext)
 
 Mask(ZICOND)      Var(riscv_zi_subext)
 
+Mask(ZIC64B)      Var(riscv_zi_subext)
+
+Mask(ZICCAMOA)    Var(riscv_zi_subext)
+
+Mask(ZICCIF)      Var(riscv_zi_subext)
+
+Mask(ZICCLSM)     Var(riscv_zi_subext)
+
+Mask(ZICCRSE)     Var(riscv_zi_subext)
+
 TargetVariable
 int riscv_za_subext
 
 Mask(ZAWRS) Var(riscv_za_subext)
 
+Mask(ZA64RS)  Var(riscv_za_subext)
+
+Mask(ZA128RS) Var(riscv_za_subext)
+
 TargetVariable
 int riscv_zb_subext
 
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index ca2c0e9..09abd2a 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -30262,6 +30262,14 @@ Supported extension are listed below:
 @tab 1.0
 @tab Integer conditional operations extension.
 
+@item za64rs
+@tab 1.0
+@tab Reservation set size of 64 bytes.
+
+@item za128rs
+@tab 1.0
+@tab Reservation set size of 128 bytes.
+
 @item zawrs
 @tab 1.0
 @tab Wait-on-reservation-set extension.
@@ -30370,6 +30378,26 @@ Supported extension are listed below:
 @tab 1.0
 @tab Cache-block prefetch extension.
 
+@item zic64b
+@tab 1.0
+@tab Cache block size isf 64 bytes.
+
+@item ziccamoa
+@tab 1.0
+@tab Main memory supports all atomics in A.
+
+@item ziccif
+@tab 1.0
+@tab Main memory supports instruction fetch with atomicity requirement.
+
+@item zicclsm
+@tab 1.0
+@tab Main memory supports misaligned loads/stores.
+
+@item ziccrse
+@tab 1.0
+@tab Main memory supports forward progress on LR/SC sequences.
+
 @item zicntr
 @tab 2.0
 @tab Standard extension for base counters and timers.
diff --git a/gcc/testsuite/gcc.target/riscv/za-ext.c b/gcc/testsuite/gcc.target/riscv/za-ext.c
new file mode 100644
index 0000000..126da2f
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/za-ext.c
@@ -0,0 +1,17 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv64gc_za64rs_za128rs" { target { rv64 } } } */
+/* { dg-options "-march=rv32gc_za64rs_za128rs" { target { rv32 } } } */
+
+#ifndef __riscv_za64rs
+#error "Feature macro for 'za64rs' not defined"
+#endif
+
+#ifndef __riscv_za128rs
+#error "Feature macro for 'za128rs' not defined"
+#endif
+
+int
+foo (int a)
+{
+  return a;
+}
diff --git a/gcc/testsuite/gcc.target/riscv/zi-ext.c b/gcc/testsuite/gcc.target/riscv/zi-ext.c
new file mode 100644
index 0000000..65a7acb
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/zi-ext.c
@@ -0,0 +1,29 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv64gc_zic64b_ziccamoa_ziccif_zicclsm_ziccrse" { target { rv64 } } } */
+/* { dg-options "-march=rv32gc_zic64b_ziccamoa_ziccif_zicclsm_ziccrse" { target { rv32 } } } */
+
+#ifndef __riscv_zic64b
+#error "Feature macro for 'zic64b' not defined"
+#endif
+
+#ifndef __riscv_ziccamoa
+#error "Feature macro for 'ziccamoa' not defined"
+#endif
+
+#ifndef __riscv_ziccif
+#error "Feature macro for 'ziccif' not defined"
+#endif
+
+#ifndef __riscv_zicclsm
+#error "Feature macro for 'zicclsm' not defined"
+#endif
+
+#ifndef __riscv_ziccrse
+#error "Feature macro for 'ziccrse' not defined"
+#endif
+
+int
+foo (int a)
+{
+  return a;
+}