[gcc(refs/vendors/riscv/heads/gcc-15-with-riscv-opts)] RISC-V: Support Ssccptr extension.

[Jeff Law via Gcc-cvs]

https://gcc.gnu.org/g:f58bec28867f6e555ef53b64b1a7dd31b61e64cb

commit f58bec28867f6e555ef53b64b1a7dd31b61e64cb
Author: Jiawei <jia...@iscas.ac.cn>
Date:   Thu Jun 5 13:15:02 2025 +0800

    RISC-V: Support Ssccptr extension.
    
    Support the Ssccptr extension, which allows the main memory to support
    page table reads.
    
    gcc/ChangeLog:
    
            * config/riscv/riscv-ext.def: New extension definition.
            * config/riscv/riscv-ext.opt: New extension mask.
            * doc/riscv-ext.texi: Document the new extension.
    
    gcc/testsuite/ChangeLog:
    
            * gcc.target/riscv/arch-ssccptr.c: New test.
    
    Signed-off-by: Jiawei <jia...@iscas.ac.cn>
    (cherry picked from commit a84b388c84aa7bfed62bf3733330f3c82d37c943)

Diff:
---
 gcc/config/riscv/riscv-ext.def                | 13 +++++++++++++
 gcc/config/riscv/riscv-ext.opt                |  2 ++
 gcc/doc/riscv-ext.texi                        |  4 ++++
 gcc/testsuite/gcc.target/riscv/arch-ssccptr.c |  5 +++++
 4 files changed, 24 insertions(+)

diff --git a/gcc/config/riscv/riscv-ext.def b/gcc/config/riscv/riscv-ext.def
index 98e7b82c8d17..ec0a08c3282c 100644
--- a/gcc/config/riscv/riscv-ext.def
+++ b/gcc/config/riscv/riscv-ext.def
@@ -1805,6 +1805,19 @@ DEFINE_RISCV_EXT(
   /* BITMASK_BIT_POSITION*/ BITMASK_NOT_YET_ALLOCATED,
   /* EXTRA_EXTENSION_FLAGS */ 0)
 
+DEFINE_RISCV_EXT(
+  /* NAME */ ssccptr,
+  /* UPPERCASE_NAME */ SSCCPTR,
+  /* FULL_NAME */ "Main memory supports page table reads",
+  /* DESC */ "",
+  /* URL */ ,
+  /* DEP_EXTS */ ({}),
+  /* SUPPORTED_VERSIONS */ ({{1, 0}}),
+  /* FLAG_GROUP */ ss,
+  /* BITMASK_GROUP_ID */ BITMASK_NOT_YET_ALLOCATED,
+  /* BITMASK_BIT_POSITION*/ BITMASK_NOT_YET_ALLOCATED,
+  /* EXTRA_EXTENSION_FLAGS */ 0)
+
 DEFINE_RISCV_EXT(
   /* NAME */ sscofpmf,
   /* UPPERCASE_NAME */ SSCOFPMF,
diff --git a/gcc/config/riscv/riscv-ext.opt b/gcc/config/riscv/riscv-ext.opt
index 73868798db68..f851678236bd 100644
--- a/gcc/config/riscv/riscv-ext.opt
+++ b/gcc/config/riscv/riscv-ext.opt
@@ -355,6 +355,8 @@ Mask(SMDBLTRP) Var(riscv_sm_subext)
 
 Mask(SSAIA) Var(riscv_ss_subext)
 
+Mask(SSCCPTR) Var(riscv_ss_subext)
+
 Mask(SSCOFPMF) Var(riscv_ss_subext)
 
 Mask(SSCSRIND) Var(riscv_ss_subext)
diff --git a/gcc/doc/riscv-ext.texi b/gcc/doc/riscv-ext.texi
index 2d2631e726dc..83aa436b4665 100644
--- a/gcc/doc/riscv-ext.texi
+++ b/gcc/doc/riscv-ext.texi
@@ -534,6 +534,10 @@
 @tab 1.0
 @tab Advanced interrupt architecture extension for supervisor-mode
 
+@item ssccptr
+@tab 1.0
+@tab Main memory supports page table reads
+
 @item sscofpmf
 @tab 1.0
 @tab Count overflow & filtering extension
diff --git a/gcc/testsuite/gcc.target/riscv/arch-ssccptr.c 
b/gcc/testsuite/gcc.target/riscv/arch-ssccptr.c
new file mode 100644
index 000000000000..902155a0818c
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/arch-ssccptr.c
@@ -0,0 +1,5 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv64i_ssccptr -mabi=lp64" } */
+int foo()
+{
+}