[PATCH v1] RISC-V: Support RVV VFWNMACC rounding mode intrinsic API

[pan2.li@intel.com]

From: Pan Li <pan2.li@intel.com>

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

* __riscv_vfwnmacc_vv_f64m2_rm
* __riscv_vfwnmacc_vv_f64m2_rm_m
* __riscv_vfwnmacc_vf_f64m2_rm
* __riscv_vfwnmacc_vf_f64m2_rm_m

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

gcc/ChangeLog:

	* config/riscv/riscv-vector-builtins-bases.cc
	(class vfwnmacc_frm): New class for frm.
	(vfwnmacc_frm_obj): New declaration.
	(BASE): Ditto.
	* config/riscv/riscv-vector-builtins-bases.h: Ditto.
	* config/riscv/riscv-vector-builtins-functions.def
	(vfwnmacc_frm): New intrinsic function definition.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/rvv/base/float-point-wnmacc.c: New test.
---
 .../riscv/riscv-vector-builtins-bases.cc      | 25 ++++++++++
 .../riscv/riscv-vector-builtins-bases.h       |  1 +
 .../riscv/riscv-vector-builtins-functions.def |  2 +
 .../riscv/rvv/base/float-point-wnmacc.c       | 47 +++++++++++++++++++
 4 files changed, 75 insertions(+)
 create mode 100644 gcc/testsuite/gcc.target/riscv/rvv/base/float-point-wnmacc.c

diff --git a/gcc/config/riscv/riscv-vector-builtins-bases.cc b/gcc/config/riscv/riscv-vector-builtins-bases.cc
index e84d6d1d047..4a7f2b8e3e9 100644
--- a/gcc/config/riscv/riscv-vector-builtins-bases.cc
+++ b/gcc/config/riscv/riscv-vector-builtins-bases.cc
@@ -562,6 +562,29 @@ public:
   }
 };
 
+/* Implements below instructions for frm
+   - vfwnmacc
+*/
+class vfwnmacc_frm : public function_base
+{
+public:
+  bool has_rounding_mode_operand_p () const override { return true; }
+
+  bool has_merge_operand_p () const override { return false; }
+
+  rtx expand (function_expander &e) const override
+  {
+    if (e.op_info->op == OP_TYPE_vf)
+      return e.use_widen_ternop_insn (
+	code_for_pred_widen_mul_neg_scalar (MINUS, e.vector_mode ()));
+    if (e.op_info->op == OP_TYPE_vv)
+      return e.use_widen_ternop_insn (
+	code_for_pred_widen_mul_neg (MINUS, e.vector_mode ()));
+
+    gcc_unreachable ();
+  }
+};
+
 /* Implements vrsub.  */
 class vrsub : public function_base
 {
@@ -2340,6 +2363,7 @@ static CONSTEXPR const vfmsub_frm vfmsub_frm_obj;
 static CONSTEXPR const vfwmacc vfwmacc_obj;
 static CONSTEXPR const vfwmacc_frm vfwmacc_frm_obj;
 static CONSTEXPR const vfwnmacc vfwnmacc_obj;
+static CONSTEXPR const vfwnmacc_frm vfwnmacc_frm_obj;
 static CONSTEXPR const vfwmsac vfwmsac_obj;
 static CONSTEXPR const vfwnmsac vfwnmsac_obj;
 static CONSTEXPR const unop<SQRT> vfsqrt_obj;
@@ -2584,6 +2608,7 @@ BASE (vfmsub_frm)
 BASE (vfwmacc)
 BASE (vfwmacc_frm)
 BASE (vfwnmacc)
+BASE (vfwnmacc_frm)
 BASE (vfwmsac)
 BASE (vfwnmsac)
 BASE (vfsqrt)
diff --git a/gcc/config/riscv/riscv-vector-builtins-bases.h b/gcc/config/riscv/riscv-vector-builtins-bases.h
index acbc7d42fbe..27c7deb4ec2 100644
--- a/gcc/config/riscv/riscv-vector-builtins-bases.h
+++ b/gcc/config/riscv/riscv-vector-builtins-bases.h
@@ -178,6 +178,7 @@ extern const function_base *const vfmsub_frm;
 extern const function_base *const vfwmacc;
 extern const function_base *const vfwmacc_frm;
 extern const function_base *const vfwnmacc;
+extern const function_base *const vfwnmacc_frm;
 extern const function_base *const vfwmsac;
 extern const function_base *const vfwnmsac;
 extern const function_base *const vfsqrt;
diff --git a/gcc/config/riscv/riscv-vector-builtins-functions.def b/gcc/config/riscv/riscv-vector-builtins-functions.def
index 0b73a5bcbc5..481c3b899f2 100644
--- a/gcc/config/riscv/riscv-vector-builtins-functions.def
+++ b/gcc/config/riscv/riscv-vector-builtins-functions.def
@@ -378,6 +378,8 @@ DEF_RVV_FUNCTION (vfwnmsac, alu, full_preds, f_wwfv_ops)
 
 DEF_RVV_FUNCTION (vfwmacc_frm, alu_frm, full_preds, f_wwvv_ops)
 DEF_RVV_FUNCTION (vfwmacc_frm, alu_frm, full_preds, f_wwfv_ops)
+DEF_RVV_FUNCTION (vfwnmacc_frm, alu_frm, full_preds, f_wwvv_ops)
+DEF_RVV_FUNCTION (vfwnmacc_frm, alu_frm, full_preds, f_wwfv_ops)
 
 // 13.8. Vector Floating-Point Square-Root Instruction
 DEF_RVV_FUNCTION (vfsqrt, alu, full_preds, f_v_ops)
diff --git a/gcc/testsuite/gcc.target/riscv/rvv/base/float-point-wnmacc.c b/gcc/testsuite/gcc.target/riscv/rvv/base/float-point-wnmacc.c
new file mode 100644
index 00000000000..2602289ec88
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/rvv/base/float-point-wnmacc.c
@@ -0,0 +1,47 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv64gcv -mabi=lp64 -O3 -Wno-psabi" } */
+
+#include "riscv_vector.h"
+
+typedef float float32_t;
+
+vfloat64m2_t
+test_vfwnmacc_vv_f32m1_rm (vfloat64m2_t vd, vfloat32m1_t op1, vfloat32m1_t op2,
+			   size_t vl) {
+  return __riscv_vfwnmacc_vv_f64m2_rm (vd, op1, op2, 0, vl);
+}
+
+vfloat64m2_t
+test_vfwnmacc_vv_f32m1_rm_m (vbool32_t mask, vfloat64m2_t vd, vfloat32m1_t op1,
+			     vfloat32m1_t op2, size_t vl) {
+  return __riscv_vfwnmacc_vv_f64m2_rm_m (mask, vd, op1, op2, 1, vl);
+}
+
+vfloat64m2_t
+test_vfwnmacc_vf_f32m1_rm (vfloat64m2_t vd, float32_t op1, vfloat32m1_t op2,
+			   size_t vl) {
+  return __riscv_vfwnmacc_vf_f64m2_rm (vd, op1, op2, 2, vl);
+}
+
+vfloat64m2_t
+test_vfwnmacc_vf_f32m1_rm_m (vbool32_t mask, vfloat64m2_t vd, float32_t op1,
+			     vfloat32m1_t op2, size_t vl) {
+  return __riscv_vfwnmacc_vf_f64m2_rm_m (mask, vd, op1, op2, 3, vl);
+}
+
+vfloat64m2_t
+test_vfwnmacc_vv_f32m1 (vfloat64m2_t vd, vfloat32m1_t op1, vfloat32m1_t op2,
+			size_t vl) {
+  return __riscv_vfwnmacc_vv_f64m2 (vd, op1, op2, vl);
+}
+
+vfloat64m2_t
+test_vfwnmacc_vv_f32m1_m (vbool32_t mask, vfloat64m2_t vd, vfloat32m1_t op1,
+			  vfloat32m1_t op2, size_t vl) {
+  return __riscv_vfwnmacc_vv_f64m2_m (mask, vd, op1, op2, vl);
+}
+
+/* { dg-final { scan-assembler-times {vfwnmacc\.[vw][vf]\s+v[0-9]+,\s*[fav]+[0-9]+,\s*[fav]+[0-9]+} 6 } } */
+/* { dg-final { scan-assembler-times {frrm\s+[axs][0-9]+} 4 } } */
+/* { dg-final { scan-assembler-times {fsrm\s+[axs][0-9]+} 4 } } */
+/* { dg-final { scan-assembler-times {fsrmi\s+[01234]} 4 } } */
-- 
2.34.1