RISC-V: Support RVV VFREC7 rounding mode intrinsic API

Update in v2:

1. Remove the template of vfrec7 frm class.
2. Update the vfrec7_frm_obj declaration.

Original logs:

This patch would like to support the rounding mode API for the
VFREC7 as the below samples.

* __riscv_vfrec7_v_f32m1_rm
* __riscv_vfrec7_v_f32m1_rm_m

Signed-off-by: Pan Li <pan2.li@intel.com>

gcc/ChangeLog:

	* config/riscv/riscv-vector-builtins-bases.cc
	(class vfrec7_frm): New class for frm.
	(vfrec7_frm_obj): New declaration.
	(BASE): Ditto.
	* config/riscv/riscv-vector-builtins-bases.h: Ditto.
	* config/riscv/riscv-vector-builtins-functions.def
	(vfrec7_frm): New intrinsic function definition.
	* config/riscv/vector-iterators.md
	(VFMISC): Remove VFREC7.
	(misc_op): Ditto.
	(float_insn_type): Ditto.
	(VFMISC_FRM): New int iterator.
	(misc_frm_op): New op for frm.
	(float_frm_insn_type): New type for frm.
	* config/riscv/vector.md (@pred_<misc_frm_op><mode>):
	New pattern for misc frm.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/rvv/base/float-point-rec7.c: New test.

6 files changed, 82 insertions, 3 deletions

diff --git a/gcc/config/riscv/riscv-vector-builtins-bases.cc b/gcc/config/riscv/riscv-vector-builtins-bases.cc
index 2074dac..f212408 100644
--- a/gcc/config/riscv/riscv-vector-builtins-bases.cc
+++ b/gcc/config/riscv/riscv-vector-builtins-bases.cc
@@ -646,6 +646,20 @@ public:
   }
 };
 
+/* Implements below instructions for frm
+   - vfrec7
+*/
+class vfrec7_frm : public function_base
+{
+public:
+  bool has_rounding_mode_operand_p () const override { return true; }
+
+  rtx expand (function_expander &e) const override
+  {
+    return e.use_exact_insn (code_for_pred (UNSPEC_VFREC7, e.vector_mode ()));
+  }
+};
+
 /* Implements vrsub.  */
 class vrsub : public function_base
 {
@@ -2433,6 +2447,7 @@ static CONSTEXPR const unop<SQRT> vfsqrt_obj;
 static CONSTEXPR const unop_frm<SQRT> vfsqrt_frm_obj;
 static CONSTEXPR const float_misc<UNSPEC_VFRSQRT7> vfrsqrt7_obj;
 static CONSTEXPR const float_misc<UNSPEC_VFREC7> vfrec7_obj;
+static CONSTEXPR const vfrec7_frm vfrec7_frm_obj;
 static CONSTEXPR const binop<SMIN> vfmin_obj;
 static CONSTEXPR const binop<SMAX> vfmax_obj;
 static CONSTEXPR const float_misc<UNSPEC_VCOPYSIGN> vfsgnj_obj;
@@ -2681,6 +2696,7 @@ BASE (vfsqrt)
 BASE (vfsqrt_frm)
 BASE (vfrsqrt7)
 BASE (vfrec7)
+BASE (vfrec7_frm)
 BASE (vfmin)
 BASE (vfmax)
 BASE (vfsgnj)
diff --git a/gcc/config/riscv/riscv-vector-builtins-bases.h b/gcc/config/riscv/riscv-vector-builtins-bases.h
index 5c91381..2a9381e 100644
--- a/gcc/config/riscv/riscv-vector-builtins-bases.h
+++ b/gcc/config/riscv/riscv-vector-builtins-bases.h
@@ -187,6 +187,7 @@ extern const function_base *const vfsqrt;
 extern const function_base *const vfsqrt_frm;
 extern const function_base *const vfrsqrt7;
 extern const function_base *const vfrec7;
+extern const function_base *const vfrec7_frm;
 extern const function_base *const vfmin;
 extern const function_base *const vfmax;
 extern const function_base *const vfsgnj;
diff --git a/gcc/config/riscv/riscv-vector-builtins-functions.def b/gcc/config/riscv/riscv-vector-builtins-functions.def
index a821aca..34def6b 100644
--- a/gcc/config/riscv/riscv-vector-builtins-functions.def
+++ b/gcc/config/riscv/riscv-vector-builtins-functions.def
@@ -396,6 +396,8 @@ DEF_RVV_FUNCTION (vfrsqrt7, alu, full_preds, f_v_ops)
 // 13.10. Vector Floating-Point Reciprocal Estimate Instruction
 DEF_RVV_FUNCTION (vfrec7, alu, full_preds, f_v_ops)
 
+DEF_RVV_FUNCTION (vfrec7_frm, alu_frm, full_preds, f_v_ops)
+
 // 13.11. Vector Floating-Point MIN/MAX Instructions
 DEF_RVV_FUNCTION (vfmin, alu, full_preds, f_vvv_ops)
 DEF_RVV_FUNCTION (vfmin, alu, full_preds, f_vvf_ops)
diff --git a/gcc/config/riscv/vector-iterators.md b/gcc/config/riscv/vector-iterators.md
index 30808ce..9dd611e 100644
--- a/gcc/config/riscv/vector-iterators.md
+++ b/gcc/config/riscv/vector-iterators.md
@@ -1867,7 +1867,9 @@
 
 (define_int_iterator VMISC [UNSPEC_VMSBF UNSPEC_VMSIF UNSPEC_VMSOF])
 
-(define_int_iterator VFMISC [UNSPEC_VFRSQRT7 UNSPEC_VFREC7])
+(define_int_iterator VFMISC [UNSPEC_VFRSQRT7])
+
+(define_int_iterator VFMISC_FRM [UNSPEC_VFREC7])
 
 (define_int_iterator VFCVTS [UNSPEC_VFCVT UNSPEC_UNSIGNED_VFCVT])
 
@@ -1890,9 +1892,13 @@
 				(UNSPEC_VNCLIPU "vnclip")])
 
 (define_int_attr misc_op [(UNSPEC_VMSBF "sbf") (UNSPEC_VMSIF "sif") (UNSPEC_VMSOF "sof")
-			  (UNSPEC_VFRSQRT7 "rsqrt7") (UNSPEC_VFREC7 "rec7")])
+			  (UNSPEC_VFRSQRT7 "rsqrt7")])
+
+(define_int_attr misc_frm_op [(UNSPEC_VFREC7 "rec7")])
+
+(define_int_attr float_insn_type [(UNSPEC_VFRSQRT7 "vfsqrt")])
 
-(define_int_attr float_insn_type [(UNSPEC_VFRSQRT7 "vfsqrt") (UNSPEC_VFREC7 "vfrecp")])
+(define_int_attr float_frm_insn_type [(UNSPEC_VFREC7 "vfrecp")])
 
 (define_int_iterator VCOPYSIGNS [UNSPEC_VCOPYSIGN UNSPEC_VXORSIGN])
 
diff --git a/gcc/config/riscv/vector.md b/gcc/config/riscv/vector.md
index 2550fc9..ff84f3f 100644
--- a/gcc/config/riscv/vector.md
+++ b/gcc/config/riscv/vector.md
@@ -6812,6 +6812,29 @@
   [(set_attr "type" "<float_insn_type>")
    (set_attr "mode" "<MODE>")])
 
+(define_insn "@pred_<misc_frm_op><mode>"
+  [(set (match_operand:VF 0 "register_operand"           "=vd, vd, vr, vr")
+	(if_then_else:VF
+	  (unspec:<VM>
+	    [(match_operand:<VM> 1 "vector_mask_operand" " vm, vm,Wc1,Wc1")
+	     (match_operand 4 "vector_length_operand"    " rK, rK, rK, rK")
+	     (match_operand 5 "const_int_operand"        "  i,  i,  i,  i")
+	     (match_operand 6 "const_int_operand"        "  i,  i,  i,  i")
+	     (match_operand 7 "const_int_operand"        "  i,  i,  i,  i")
+	     (match_operand 8 "const_int_operand"        "  i,  i,  i,  i")
+	     (reg:SI VL_REGNUM)
+	     (reg:SI VTYPE_REGNUM)
+	     (reg:SI FRM_REGNUM)] UNSPEC_VPREDICATE)
+	  (unspec:VF
+	    [(match_operand:VF 3 "register_operand"       " vr, vr, vr, vr")] VFMISC_FRM)
+	  (match_operand:VF 2 "vector_merge_operand"     " vu,  0, vu,  0")))]
+  "TARGET_VECTOR"
+  "vf<misc_frm_op>.v\t%0,%3%p1"
+  [(set_attr "type" "<float_frm_insn_type>")
+   (set_attr "mode" "<MODE>")
+   (set (attr "frm_mode")
+	(symbol_ref "riscv_vector::get_frm_mode (operands[8])"))])
+
 (define_insn "@pred_class<mode>"
   [(set (match_operand:<VCONVERT> 0 "register_operand"       "=vd, vd, vr, vr")
 	(if_then_else:<VCONVERT>
diff --git a/gcc/testsuite/gcc.target/riscv/rvv/base/float-point-rec7.c b/gcc/testsuite/gcc.target/riscv/rvv/base/float-point-rec7.c
new file mode 100644
index 0000000..a8e10d0
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/rvv/base/float-point-rec7.c
@@ -0,0 +1,31 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv64gcv -mabi=lp64 -O3 -Wno-psabi" } */
+
+#include "riscv_vector.h"
+
+typedef float float32_t;
+
+vfloat32m1_t
+test_riscv_vfrec7_vv_f32m1_rm (vfloat32m1_t op1, size_t vl) {
+  return __riscv_vfrec7_v_f32m1_rm (op1, 0, vl);
+}
+
+vfloat32m1_t
+test_vfrec7_vv_f32m1_rm_m (vbool32_t mask, vfloat32m1_t op1, size_t vl) {
+  return __riscv_vfrec7_v_f32m1_rm_m (mask, op1, 1, vl);
+}
+
+vfloat32m1_t
+test_riscv_vfrec7_vv_f32m1 (vfloat32m1_t op1, size_t vl) {
+  return __riscv_vfrec7_v_f32m1 (op1, vl);
+}
+
+vfloat32m1_t
+test_vfrec7_vv_f32m1_m (vbool32_t mask, vfloat32m1_t op1, size_t vl) {
+  return __riscv_vfrec7_v_f32m1_m (mask, op1, vl);
+}
+
+/* { dg-final { scan-assembler-times {vfrec7\.v\s+v[0-9]+,\s*v[0-9]+} 4 } } */
+/* { dg-final { scan-assembler-times {frrm\s+[axs][0-9]+} 2 } } */
+/* { dg-final { scan-assembler-times {fsrm\s+[axs][0-9]+} 2 } } */
+/* { dg-final { scan-assembler-times {fsrmi\s+[01234]} 2 } } */