[gcc(refs/vendors/riscv/heads/gcc-15-with-riscv-opts)] [PATCH] RISC-V: Minimal support for zama16b extension.

[Jeff Law]

https://gcc.gnu.org/g:0ee337813a214dc2bdc578c934d535d990028a7f

commit 0ee337813a214dc2bdc578c934d535d990028a7f
Author: Dongyan Chen <chendongyan@isrc.iscas.ac.cn>
Date:   Wed May 7 11:33:06 2025 -0600

    [PATCH] RISC-V: Minimal support for zama16b extension.
    
    This patch support zama16b extension[1].
    To enable GCC to recognize and process zama16b extension correctly at compile time.
    
    [1] https://github.com/riscv/riscv-profiles/blob/main/src/rva23-profile.adoc
    
    gcc/ChangeLog:
    
            * common/config/riscv/riscv-common.cc: New extension.
            * config/riscv/riscv.opt: Ditto.
    
    gcc/testsuite/ChangeLog:
    
            * gcc.target/riscv/arch-48.c: New test.
    
    (cherry picked from commit 974b079741f902fcf4323dfcecbbffdb9f56f3bf)

Diff:
---
 gcc/common/config/riscv/riscv-common.cc  | 2 ++
 gcc/config/riscv/riscv.opt               | 2 ++
 gcc/testsuite/gcc.target/riscv/arch-48.c | 5 +++++
 3 files changed, 9 insertions(+)

diff --git a/gcc/common/config/riscv/riscv-common.cc b/gcc/common/config/riscv/riscv-common.cc
index 0233e1a108be..ca14eb96b253 100644
--- a/gcc/common/config/riscv/riscv-common.cc
+++ b/gcc/common/config/riscv/riscv-common.cc
@@ -327,6 +327,7 @@ static const struct riscv_ext_version riscv_ext_version_table[] =
   {"zalrsc", ISA_SPEC_CLASS_NONE, 1, 0},
   {"zabha", ISA_SPEC_CLASS_NONE, 1, 0},
   {"zacas", ISA_SPEC_CLASS_NONE, 1, 0},
+  {"zama16b", ISA_SPEC_CLASS_NONE, 1, 0},
 
   {"zba", ISA_SPEC_CLASS_NONE, 1, 0},
   {"zbb", ISA_SPEC_CLASS_NONE, 1, 0},
@@ -1657,6 +1658,7 @@ static const riscv_ext_flag_table_t riscv_ext_flag_table[] =
   RISCV_EXT_FLAG_ENTRY ("zalrsc",  x_riscv_za_subext, MASK_ZALRSC),
   RISCV_EXT_FLAG_ENTRY ("zabha",   x_riscv_za_subext, MASK_ZABHA),
   RISCV_EXT_FLAG_ENTRY ("zacas",   x_riscv_za_subext, MASK_ZACAS),
+  RISCV_EXT_FLAG_ENTRY ("zama16b", x_riscv_za_subext, MASK_ZAMA16B),
 
   RISCV_EXT_FLAG_ENTRY ("zba", x_riscv_zb_subext, MASK_ZBA),
   RISCV_EXT_FLAG_ENTRY ("zbb", x_riscv_zb_subext, MASK_ZBB),
diff --git a/gcc/config/riscv/riscv.opt b/gcc/config/riscv/riscv.opt
index 9e471be4055c..80593ee139c1 100644
--- a/gcc/config/riscv/riscv.opt
+++ b/gcc/config/riscv/riscv.opt
@@ -274,6 +274,8 @@ Mask(ZA64RS)  Var(riscv_za_subext)
 
 Mask(ZA128RS) Var(riscv_za_subext)
 
+Mask(ZAMA16B) Var(riscv_za_subext)
+
 TargetVariable
 int riscv_zb_subext
 
diff --git a/gcc/testsuite/gcc.target/riscv/arch-48.c b/gcc/testsuite/gcc.target/riscv/arch-48.c
new file mode 100644
index 000000000000..58a558ec1924
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/arch-48.c
@@ -0,0 +1,5 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv64gc_zama16b -mabi=lp64" } */
+int foo()
+{
+}