[gcc r13-7216] Docs: Add doc for RISC-V vector intrinsics

[gcc r13-7216] Docs: Add doc for RISC-V vector intrinsics

[Kito Cheng]

https://gcc.gnu.org/g:3d9156f890fb2cdef5b6e2c7c5c8efde869c2e29

commit r13-7216-g3d9156f890fb2cdef5b6e2c7c5c8efde869c2e29
Author: Kito Cheng <kito.cheng@sifive.com>
Date:   Tue Apr 18 18:07:06 2023 +0800

    Docs: Add doc for RISC-V vector intrinsics
    
    Document which version of RISC-V vector intrinsics has implemented in
    GCC.
    
    gcc/ChangeLog:
    
            * doc/extend.texi (Target Builtins): Add RISC-V Vector
            Intrinsics.
            (RISC-V Vector Intrinsics): Document GCC implemented which
            version of RISC-V vector intrinsics and its reference.
    
    (cherry picked from commit 14c1a8dfa3eaea283ab467c2aa3a62a25d3b49cb)

Diff:
---
 gcc/doc/extend.texi | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi
index b2a1643c53f..64711eb367e 100644
--- a/gcc/doc/extend.texi
+++ b/gcc/doc/extend.texi
@@ -14688,6 +14688,7 @@ instructions, but allow the compiler to schedule those calls.
 * PowerPC Matrix-Multiply Assist Built-in Functions::
 * PRU Built-in Functions::
 * RISC-V Built-in Functions::
+* RISC-V Vector Intrinsics::
 * RX Built-in Functions::
 * S/390 System z Built-in Functions::
 * SH Built-in Functions::
@@ -21119,6 +21120,14 @@ Xgnuzihintpausestate extension, which redefines the @code{pause} instruction to
 change architectural state.
 @enddefbuiltin
 
+@node RISC-V Vector Intrinsics
+@subsection RISC-V Vector Intrinsics
+
+GCC supports vector intrinsics as specified in version 0.11 of the RISC-V
+vector intrinsic specification, which is available at the following link:
+@uref{https://github.com/riscv-non-isa/rvv-intrinsic-doc/tree/v0.11.x}.
+All of these functions are declared in the include file @file{riscv_vector.h}.
+
 @node RX Built-in Functions
 @subsection RX Built-in Functions
 GCC supports some of the RX instructions which cannot be expressed in