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* [gcc(refs/vendors/riscv/heads/gcc-13-with-riscv-opts)] RISC-V: Support combine extend and reduce sum to widen reduce sum
@ 2023-09-18 18:26 Jeff Law
  0 siblings, 0 replies; only message in thread
From: Jeff Law @ 2023-09-18 18:26 UTC (permalink / raw)
  To: gcc-cvs

https://gcc.gnu.org/g:1cfc53fbd9759e5b41daa479103fe1a641df271a

commit 1cfc53fbd9759e5b41daa479103fe1a641df271a
Author: Lehua Ding <lehua.ding@rivai.ai>
Date:   Thu Sep 14 23:35:42 2023 +0800

    RISC-V: Support combine extend and reduce sum to widen reduce sum
    
    This patch add combine pattern to combine extend and reduce sum
    to widen reduce sum. The pattern in autovec.md was adjusted as
    needed. Note that the current vectorization cannot generate reduce
    operand which is LMUL=M8, because this means that we need an LMUL=M16
    for the extended operand, which is currently not possible. So I've
    added VI_QHS_NO_M8 and VF_HS_NO_M8 mode iterator, which exclude
    mode which is LMUL=M8.
    
            PR target/111381
    
    gcc/ChangeLog:
    
            * config/riscv/autovec-opt.md (*reduc_plus_scal_<mode>):
            New combine pattern.
            (*fold_left_widen_plus_<mode>): Ditto.
            (*mask_len_fold_left_widen_plus_<mode>): Ditto.
            * config/riscv/autovec.md (reduc_plus_scal_<mode>):
            Change from define_expand to define_insn_and_split.
            (fold_left_plus_<mode>): Ditto.
            (mask_len_fold_left_plus_<mode>): Ditto.
            * config/riscv/riscv-v.cc (expand_reduction):
            Support widen reduction.
            * config/riscv/vector-iterators.md (UNSPEC_WREDUC_SUM):
            Add new iterators and attrs.
    
    gcc/testsuite/ChangeLog:
    
            * gcc.target/riscv/rvv/autovec/widen/widen_reduc-1.c: New test.
            * gcc.target/riscv/rvv/autovec/widen/widen_reduc_order-1.c: New test.
            * gcc.target/riscv/rvv/autovec/widen/widen_reduc_order-2.c: New test.
            * gcc.target/riscv/rvv/autovec/widen/widen_reduc_order_run-1.c: New test.
            * gcc.target/riscv/rvv/autovec/widen/widen_reduc_order_run-2.c: New test.
            * gcc.target/riscv/rvv/autovec/widen/widen_reduc_run-1.c: New test.
    
    (cherry picked from commit 68cb873fd360dbb64f2a6dfb28e79399ff99d07d)

Diff:
---
 gcc/config/riscv/autovec-opt.md                    | 82 ++++++++++++++++++++++
 gcc/config/riscv/autovec.md                        | 74 ++++++++++++-------
 gcc/config/riscv/riscv-v.cc                        |  7 +-
 gcc/config/riscv/vector-iterators.md               | 51 ++++++++++++++
 .../riscv/rvv/autovec/widen/widen_reduc-1.c        | 27 +++++++
 .../riscv/rvv/autovec/widen/widen_reduc_order-1.c  | 20 ++++++
 .../riscv/rvv/autovec/widen/widen_reduc_order-2.c  | 19 +++++
 .../rvv/autovec/widen/widen_reduc_order_run-1.c    | 24 +++++++
 .../rvv/autovec/widen/widen_reduc_order_run-2.c    | 22 ++++++
 .../riscv/rvv/autovec/widen/widen_reduc_run-1.c    | 22 ++++++
 10 files changed, 321 insertions(+), 27 deletions(-)

diff --git a/gcc/config/riscv/autovec-opt.md b/gcc/config/riscv/autovec-opt.md
index 22ab8afc994..df516849527 100644
--- a/gcc/config/riscv/autovec-opt.md
+++ b/gcc/config/riscv/autovec-opt.md
@@ -1196,6 +1196,88 @@
 }
 [(set_attr "type" "vfwmul")])
 
+;; Combine extend + vredsum to vwredsum[u]
+(define_insn_and_split "*reduc_plus_scal_<mode>"
+  [(set (match_operand:<V_DOUBLE_EXTEND_VEL> 0 "register_operand")
+        (unspec:<V_DOUBLE_EXTEND_VEL> [
+          (any_extend:<V_DOUBLE_EXTEND>
+            (match_operand:VI_QHS_NO_M8 1 "register_operand"))
+        ] UNSPEC_REDUC_SUM))]
+  "TARGET_VECTOR && can_create_pseudo_p ()"
+  "#"
+  "&& 1"
+  [(const_int 0)]
+{
+  riscv_vector::expand_reduction (<WREDUC_UNSPEC>, operands,
+                                  CONST0_RTX (<V_DOUBLE_EXTEND_VEL>mode));
+  DONE;
+}
+[(set_attr "type" "vector")])
+
+;; Combine extend + vfredusum to vfwredusum
+(define_insn_and_split "*reduc_plus_scal_<mode>"
+  [(set (match_operand:<V_DOUBLE_EXTEND_VEL> 0 "register_operand")
+        (unspec:<V_DOUBLE_EXTEND_VEL> [
+          (float_extend:<V_DOUBLE_EXTEND>
+            (match_operand:VF_HS_NO_M8 1 "register_operand"))
+        ] UNSPEC_REDUC_SUM_UNORDERED))]
+  "TARGET_VECTOR && can_create_pseudo_p ()"
+  "#"
+  "&& 1"
+  [(const_int 0)]
+{
+  riscv_vector::expand_reduction (UNSPEC_WREDUC_SUM_UNORDERED, operands,
+                                  CONST0_RTX (<V_DOUBLE_EXTEND_VEL>mode));
+  DONE;
+}
+[(set_attr "type" "vector")])
+
+;; Combine extend + vfredosum to vfwredosum
+(define_insn_and_split "*fold_left_widen_plus_<mode>"
+  [(set (match_operand:<V_DOUBLE_EXTEND_VEL> 0 "register_operand")
+        (unspec:<V_DOUBLE_EXTEND_VEL> [
+          (float_extend:<V_DOUBLE_EXTEND>
+            (match_operand:VF_HS_NO_M8 2 "register_operand"))
+          (match_operand:<V_DOUBLE_EXTEND_VEL> 1 "register_operand")
+        ] UNSPEC_REDUC_SUM_ORDERED))]
+  "TARGET_VECTOR && can_create_pseudo_p ()"
+  "#"
+  "&& 1"
+  [(const_int 0)]
+{
+  riscv_vector::expand_reduction (UNSPEC_WREDUC_SUM_ORDERED, operands,
+				  operands[1],
+				  riscv_vector::reduction_type::FOLD_LEFT);
+  DONE;
+}
+[(set_attr "type" "vector")])
+
+;; Combine extend + mask vfredosum to mask vfwredosum
+(define_insn_and_split "*mask_len_fold_left_widen_plus_<mode>"
+  [(set (match_operand:<V_DOUBLE_EXTEND_VEL> 0 "register_operand")
+        (unspec:<V_DOUBLE_EXTEND_VEL> [
+          (float_extend:<V_DOUBLE_EXTEND>
+            (match_operand:VF_HS_NO_M8 2 "register_operand"))
+          (match_operand:<V_DOUBLE_EXTEND_VEL> 1 "register_operand")
+          (match_operand:<VM> 3 "vector_mask_operand")
+          (match_operand 4 "autovec_length_operand")
+          (match_operand 5 "const_0_operand")
+        ] UNSPEC_REDUC_SUM_ORDERED))]
+  "TARGET_VECTOR && can_create_pseudo_p ()"
+  "#"
+  "&& 1"
+  [(const_int 0)]
+{
+  if (rtx_equal_p (operands[4], const0_rtx))
+    emit_move_insn (operands[0], operands[1]);
+  else
+    riscv_vector::expand_reduction (UNSPEC_WREDUC_SUM_ORDERED, operands,
+				    operands[1],
+				    riscv_vector::reduction_type::MASK_LEN_FOLD_LEFT);
+  DONE;
+}
+[(set_attr "type" "vector")])
+
 ;; =============================================================================
 ;; Misc combine patterns
 ;; =============================================================================
diff --git a/gcc/config/riscv/autovec.md b/gcc/config/riscv/autovec.md
index 9e05afddd29..8537b9d41f6 100644
--- a/gcc/config/riscv/autovec.md
+++ b/gcc/config/riscv/autovec.md
@@ -2086,14 +2086,20 @@
 ;; - vredxor.vs
 ;; -------------------------------------------------------------------------
 
-(define_expand "reduc_plus_scal_<mode>"
-  [(match_operand:<VEL> 0 "register_operand")
-   (match_operand:VI 1 "register_operand")]
-  "TARGET_VECTOR"
+(define_insn_and_split "reduc_plus_scal_<mode>"
+  [(set (match_operand:<VEL> 0 "register_operand")
+        (unspec:<VEL> [
+             (match_operand:VI 1 "register_operand")
+        ] UNSPEC_REDUC_SUM))]
+  "TARGET_VECTOR && can_create_pseudo_p ()"
+  "#"
+  "&& 1"
+  [(const_int 0)]
 {
   riscv_vector::expand_reduction (UNSPEC_REDUC_SUM, operands, CONST0_RTX (<VEL>mode));
   DONE;
-})
+}
+[(set_attr "type" "vector")])
 
 (define_expand "reduc_smax_scal_<mode>"
   [(match_operand:<VEL> 0 "register_operand")
@@ -2173,15 +2179,21 @@
 ;; - vfredmin.vs
 ;; -------------------------------------------------------------------------
 
-(define_expand "reduc_plus_scal_<mode>"
-  [(match_operand:<VEL> 0 "register_operand")
-   (match_operand:VF 1 "register_operand")]
-  "TARGET_VECTOR"
+(define_insn_and_split "reduc_plus_scal_<mode>"
+  [(set (match_operand:<VEL> 0 "register_operand")
+        (unspec:<VEL> [
+             (match_operand:VF 1 "register_operand")
+        ] UNSPEC_REDUC_SUM_UNORDERED))]
+  "TARGET_VECTOR && can_create_pseudo_p ()"
+  "#"
+  "&& 1"
+  [(const_int 0)]
 {
   riscv_vector::expand_reduction (UNSPEC_REDUC_SUM_UNORDERED, operands,
                                   CONST0_RTX (<VEL>mode));
   DONE;
-})
+}
+[(set_attr "type" "vector")])
 
 (define_expand "reduc_smax_scal_<mode>"
   [(match_operand:<VEL> 0 "register_operand")
@@ -2215,27 +2227,38 @@
 ;; -------------------------------------------------------------------------
 
 ;; Unpredicated in-order FP reductions.
-(define_expand "fold_left_plus_<mode>"
-  [(match_operand:<VEL> 0 "register_operand")
-   (match_operand:<VEL> 1 "register_operand")
-   (match_operand:VF 2 "register_operand")]
-  "TARGET_VECTOR"
+(define_insn_and_split "fold_left_plus_<mode>"
+  [(set (match_operand:<VEL> 0 "register_operand")
+        (unspec:<VEL> [
+             (match_operand:VF 2 "register_operand")
+             (match_operand:<VEL> 1 "register_operand")
+        ] UNSPEC_REDUC_SUM_ORDERED))]
+  "TARGET_VECTOR && can_create_pseudo_p ()"
+  "#"
+  "&& 1"
+  [(const_int 0)]
 {
   riscv_vector::expand_reduction (UNSPEC_REDUC_SUM_ORDERED, operands,
 				  operands[1],
 				  riscv_vector::reduction_type::FOLD_LEFT);
   DONE;
-})
+}
+[(set_attr "type" "vector")])
 
 ;; Predicated in-order FP reductions.
-(define_expand "mask_len_fold_left_plus_<mode>"
-  [(match_operand:<VEL> 0 "register_operand")
-   (match_operand:<VEL> 1 "register_operand")
-   (match_operand:VF 2 "register_operand")
-   (match_operand:<VM> 3 "vector_mask_operand")
-   (match_operand 4 "autovec_length_operand")
-   (match_operand 5 "const_0_operand")]
-  "TARGET_VECTOR"
+(define_insn_and_split "mask_len_fold_left_plus_<mode>"
+  [(set (match_operand:<VEL> 0 "register_operand")
+        (unspec:<VEL> [
+          (match_operand:VF 2 "register_operand")
+          (match_operand:<VEL> 1 "register_operand")
+          (match_operand:<VM> 3 "vector_mask_operand")
+          (match_operand 4 "autovec_length_operand")
+          (match_operand 5 "const_0_operand")
+        ] UNSPEC_REDUC_SUM_ORDERED))]
+  "TARGET_VECTOR && can_create_pseudo_p ()"
+  "#"
+  "&& 1"
+  [(const_int 0)]
 {
   if (rtx_equal_p (operands[4], const0_rtx))
     emit_move_insn (operands[0], operands[1]);
@@ -2244,7 +2267,8 @@
 				    operands[1],
 				    riscv_vector::reduction_type::MASK_LEN_FOLD_LEFT);
   DONE;
-})
+}
+[(set_attr "type" "vector")])
 
 ;; -------------------------------------------------------------------------
 ;; ---- [INT,FP] Extract active element
diff --git a/gcc/config/riscv/riscv-v.cc b/gcc/config/riscv/riscv-v.cc
index 1bf5471beaf..668594b65ed 100644
--- a/gcc/config/riscv/riscv-v.cc
+++ b/gcc/config/riscv/riscv-v.cc
@@ -3212,7 +3212,8 @@ expand_reduction (unsigned unspec, rtx *ops, rtx init, reduction_type type)
 {
   rtx vector = type == reduction_type::UNORDERED ? ops[1] : ops[2];
   machine_mode vmode = GET_MODE (vector);
-  machine_mode m1_mode = get_m1_mode (vmode).require ();
+  machine_mode vel_mode = GET_MODE (ops[0]);
+  machine_mode m1_mode = get_m1_mode (vel_mode).require ();
 
   rtx m1_tmp = gen_reg_rtx (m1_mode);
   rtx scalar_move_ops[] = {m1_tmp, init};
@@ -3225,7 +3226,9 @@ expand_reduction (unsigned unspec, rtx *ops, rtx init, reduction_type type)
   rtx reduc_ops[] = {m1_tmp2, vector, m1_tmp};
 
   if (unspec == UNSPEC_REDUC_SUM_ORDERED
-      || unspec == UNSPEC_REDUC_SUM_UNORDERED)
+      || unspec == UNSPEC_WREDUC_SUM_ORDERED
+      || unspec == UNSPEC_REDUC_SUM_UNORDERED
+      || unspec == UNSPEC_WREDUC_SUM_UNORDERED)
     {
       insn_code icode = code_for_pred (unspec, vmode);
       if (type == reduction_type::MASK_LEN_FOLD_LEFT)
diff --git a/gcc/config/riscv/vector-iterators.md b/gcc/config/riscv/vector-iterators.md
index c9d0a501910..fa9892cebc1 100644
--- a/gcc/config/riscv/vector-iterators.md
+++ b/gcc/config/riscv/vector-iterators.md
@@ -686,6 +686,14 @@
   RVVM8SI RVVM4SI RVVM2SI RVVM1SI (RVVMF2SI "TARGET_MIN_VLEN > 32")
 ])
 
+(define_mode_iterator VI_QHS_NO_M8 [
+  RVVM4QI RVVM2QI RVVM1QI RVVMF2QI RVVMF4QI (RVVMF8QI "TARGET_MIN_VLEN > 32")
+
+  RVVM4HI RVVM2HI RVVM1HI RVVMF2HI (RVVMF4HI "TARGET_MIN_VLEN > 32")
+
+  RVVM4SI RVVM2SI RVVM1SI (RVVMF2SI "TARGET_MIN_VLEN > 32")
+])
+
 (define_mode_iterator VF_HS [
   (RVVM8HF "TARGET_ZVFH") (RVVM4HF "TARGET_ZVFH") (RVVM2HF "TARGET_ZVFH")
   (RVVM1HF "TARGET_ZVFH") (RVVMF2HF "TARGET_ZVFH")
@@ -695,6 +703,23 @@
   (RVVM1SF "TARGET_VECTOR_ELEN_FP_32") (RVVMF2SF "TARGET_VECTOR_ELEN_FP_32 && TARGET_MIN_VLEN > 32")
 ])
 
+(define_mode_iterator VF_HS_NO_M8 [
+  (RVVM4HF "TARGET_ZVFH")
+  (RVVM2HF "TARGET_ZVFH")
+  (RVVM1HF "TARGET_ZVFH")
+  (RVVMF2HF "TARGET_ZVFH")
+  (RVVMF4HF "TARGET_ZVFH && TARGET_MIN_VLEN > 32")
+  (RVVM4SF "TARGET_VECTOR_ELEN_FP_32")
+  (RVVM2SF "TARGET_VECTOR_ELEN_FP_32")
+  (RVVM1SF "TARGET_VECTOR_ELEN_FP_32")
+  (RVVMF2SF "TARGET_VECTOR_ELEN_FP_32 && TARGET_MIN_VLEN > 32")
+])
+
+(define_mode_iterator VF_HS_M8 [
+  (RVVM8HF "TARGET_ZVFH")
+  (RVVM8SF "TARGET_VECTOR_ELEN_FP_32")
+])
+
 (define_mode_iterator V_VLSI_QHS [
   RVVM8QI RVVM4QI RVVM2QI RVVM1QI RVVMF2QI RVVMF4QI (RVVMF8QI "TARGET_MIN_VLEN > 32")
 
@@ -1319,6 +1344,8 @@
   (UNSPEC_WREDUC_SUM_ORDERED "wredosum") (UNSPEC_WREDUC_SUM_UNORDERED "wredusum")
 ])
 
+(define_code_attr WREDUC_UNSPEC [(zero_extend "UNSPEC_WREDUC_SUMU") (sign_extend "UNSPEC_WREDUC_SUM")])
+
 (define_mode_attr VINDEX [
   (RVVM8QI "RVVM8QI") (RVVM4QI "RVVM4QI") (RVVM2QI "RVVM2QI") (RVVM1QI "RVVM1QI")
   (RVVMF2QI "RVVMF2QI") (RVVMF4QI "RVVMF4QI") (RVVMF8QI "RVVMF8QI")
@@ -1743,6 +1770,18 @@
   (V1DF "DF") (V2DF "DF") (V4DF "DF") (V8DF "DF") (V16DF "DF") (V32DF "DF") (V64DF "DF") (V128DF "DF") (V256DF "DF") (V512DF "DF")
 ])
 
+(define_mode_attr V_DOUBLE_EXTEND_VEL [
+  (RVVM4QI "HI") (RVVM2QI "HI") (RVVM1QI "HI") (RVVMF2QI "HI") (RVVMF4QI "HI") (RVVMF8QI "HI")
+
+  (RVVM4HI "SI") (RVVM2HI "SI") (RVVM1HI "SI") (RVVMF2HI "SI") (RVVMF4HI "SI")
+
+  (RVVM4SI "DI") (RVVM2SI "DI") (RVVM1SI "DI") (RVVMF2SI "DI")
+
+  (RVVM4HF "SF") (RVVM2HF "SF") (RVVM1HF "SF") (RVVMF2HF "SF") (RVVMF4HF "SF")
+
+  (RVVM4SF "DF") (RVVM2SF "DF") (RVVM1SF "DF") (RVVMF2SF "DF")
+])
+
 (define_mode_attr vel [
   (RVVM8QI "qi") (RVVM4QI "qi") (RVVM2QI "qi") (RVVM1QI "qi") (RVVMF2QI "qi") (RVVMF4QI "qi") (RVVMF8QI "qi")
 
@@ -2101,6 +2140,18 @@
   (RVVM1QI "64") (RVVMF2QI "64") (RVVMF4QI "64") (RVVMF8QI "64")
 ])
 
+(define_mode_attr V_DOUBLE_EXTEND [
+  (RVVM4QI "RVVM8HI") (RVVM2QI "RVVM4HI") (RVVM1QI "RVVM2HI") (RVVMF2QI "RVVM1HI") (RVVMF4QI "RVVMF2HI") (RVVMF8QI "RVVMF4HI")
+
+  (RVVM4HI "RVVM8SI") (RVVM2HI "RVVM4SI") (RVVM1HI "RVVM2SI") (RVVMF2HI "RVVM1SI") (RVVMF4HI "RVVMF2SI")
+
+  (RVVM4SI "RVVM8DI") (RVVM2SI "RVVM4DI") (RVVM1SI "RVVM2DI") (RVVMF2SI "RVVM1DI")
+
+  (RVVM4HF "RVVM8SF") (RVVM2HF "RVVM4SF") (RVVM1HF "RVVM2SF") (RVVMF2HF "RVVM1SF") (RVVMF4HF "RVVMF2SF")
+
+  (RVVM4SF "RVVM8DF") (RVVM2SF "RVVM4DF") (RVVM1SF "RVVM2DF") (RVVMF2SF "RVVM1DF")
+])
+
 (define_mode_attr V_DOUBLE_TRUNC [
   (RVVM8HI "RVVM4QI") (RVVM4HI "RVVM2QI") (RVVM2HI "RVVM1QI") (RVVM1HI "RVVMF2QI") (RVVMF2HI "RVVMF4QI") (RVVMF4HI "RVVMF8QI")
 
diff --git a/gcc/testsuite/gcc.target/riscv/rvv/autovec/widen/widen_reduc-1.c b/gcc/testsuite/gcc.target/riscv/rvv/autovec/widen/widen_reduc-1.c
new file mode 100644
index 00000000000..80756468ec1
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/rvv/autovec/widen/widen_reduc-1.c
@@ -0,0 +1,27 @@
+/* { dg-do compile } */
+/* { dg-additional-options "-march=rv64gcv_zvfh_zvl128b -mabi=lp64d --param riscv-autovec-preference=fixed-vlmax --param riscv-autovec-lmul=m2 -fno-vect-cost-model -ffast-math" } */
+#include <stdint-gcc.h>
+
+#define TEST_TYPE(TYPE1, TYPE2, N)                                             \
+  __attribute__((noipa)) TYPE1 reduc_##TYPE1##_##TYPE2(TYPE2 *restrict a) {    \
+    TYPE1 sum = 0;                                                             \
+    for (int i = 0; i < N; i += 1)                                             \
+      sum += a[i];                                                             \
+    return sum;                                                                \
+  }
+
+#define TEST_ALL(TEST)                                                         \
+  TEST(int16_t, int8_t, 16)                                                    \
+  TEST(int32_t, int16_t, 8)                                                    \
+  TEST(int64_t, int32_t, 4)                                                    \
+  TEST(uint16_t, uint8_t, 16)                                                  \
+  TEST(uint32_t, uint16_t, 8)                                                  \
+  TEST(uint64_t, uint32_t, 4)                                                  \
+  TEST(float, _Float16, 8)                                                     \
+  TEST(double, float, 4)
+
+TEST_ALL(TEST_TYPE)
+
+/* { dg-final { scan-assembler-times {\tvfwredusum\.vs} 2 } } */
+/* { dg-final { scan-assembler-times {\tvwredsum\.vs} 3 } } */
+/* { dg-final { scan-assembler-times {\tvwredsumu\.vs} 3 } } */
diff --git a/gcc/testsuite/gcc.target/riscv/rvv/autovec/widen/widen_reduc_order-1.c b/gcc/testsuite/gcc.target/riscv/rvv/autovec/widen/widen_reduc_order-1.c
new file mode 100644
index 00000000000..7ae508096e7
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/rvv/autovec/widen/widen_reduc_order-1.c
@@ -0,0 +1,20 @@
+/* { dg-do compile } */
+/* { dg-additional-options "-march=rv64gcv_zvfh -mabi=lp64d --param riscv-autovec-preference=scalable -fno-vect-cost-model" } */
+#include <stdint-gcc.h>
+
+#define TEST_TYPE(TYPE1, TYPE2)                                                \
+  __attribute__((noipa))                                                       \
+  TYPE1 reduc_##TYPE1##_##TYPE2(TYPE2 *restrict a, int n) {                    \
+    TYPE1 sum = 0;                                                             \
+    for (int i = 0; i < n; i += 1)                                             \
+      sum += a[i];                                                             \
+    return sum;                                                                \
+  }
+
+#define TEST_ALL(TEST)                                                         \
+  TEST(float, _Float16)                                                        \
+  TEST(double, float)
+
+TEST_ALL(TEST_TYPE)
+
+/* { dg-final { scan-assembler-times {\tvfwredosum\.vs} 2 } } */
diff --git a/gcc/testsuite/gcc.target/riscv/rvv/autovec/widen/widen_reduc_order-2.c b/gcc/testsuite/gcc.target/riscv/rvv/autovec/widen/widen_reduc_order-2.c
new file mode 100644
index 00000000000..a922aa71279
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/rvv/autovec/widen/widen_reduc_order-2.c
@@ -0,0 +1,19 @@
+/* { dg-do compile } */
+/* { dg-additional-options "-march=rv64gcv_zvfh -mabi=lp64d --param riscv-autovec-preference=scalable --param riscv-autovec-lmul=m2 -fno-vect-cost-model" } */
+#include <stdint-gcc.h>
+
+#define TEST_TYPE(TYPE1, TYPE2, N)                                             \
+  __attribute__((noipa)) TYPE1 reduc_##TYPE1##_##TYPE2(TYPE2 *restrict a) {    \
+    TYPE1 sum = 0;                                                             \
+    for (int i = 0; i < N; i += 1)                                             \
+      sum += a[i];                                                             \
+    return sum;                                                                \
+  }
+
+#define TEST_ALL(TEST)                                                         \
+  TEST(float, _Float16, 8)                                                     \
+  TEST(double, float, 4)
+
+TEST_ALL(TEST_TYPE)
+
+/* { dg-final { scan-assembler-times {\tvfwredosum\.vs} 2 } } */
diff --git a/gcc/testsuite/gcc.target/riscv/rvv/autovec/widen/widen_reduc_order_run-1.c b/gcc/testsuite/gcc.target/riscv/rvv/autovec/widen/widen_reduc_order_run-1.c
new file mode 100644
index 00000000000..d4ba4f50285
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/rvv/autovec/widen/widen_reduc_order_run-1.c
@@ -0,0 +1,24 @@
+/* { dg-do run { target { riscv_vector } } } */
+/* { dg-additional-options "--param=riscv-autovec-preference=scalable -fno-vect-cost-model" } */
+
+#include "widen_reduc_order-1.c"
+
+#define N 99
+
+#define RUN(TYPE1, TYPE2)                                                      \
+  {                                                                            \
+    TYPE2 a[N];                                                                \
+    TYPE1 r = 0;                                                               \
+    for (int i = 0; i < N; i++) {                                              \
+      a[i] = (i * 0.1) * (i & 1 ? 1 : -1);                                     \
+      r += a[i];                                                               \
+      asm volatile("" ::: "memory");                                           \
+    }                                                                          \
+    if (r != reduc_##TYPE1##_##TYPE2(a, N))                                    \
+      __builtin_abort();                                                       \
+  }
+
+int __attribute__((optimize(1))) main() {
+  TEST_ALL(RUN)
+  return 0;
+}
diff --git a/gcc/testsuite/gcc.target/riscv/rvv/autovec/widen/widen_reduc_order_run-2.c b/gcc/testsuite/gcc.target/riscv/rvv/autovec/widen/widen_reduc_order_run-2.c
new file mode 100644
index 00000000000..6ac676245dc
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/rvv/autovec/widen/widen_reduc_order_run-2.c
@@ -0,0 +1,22 @@
+/* { dg-do run { target { riscv_vector } } } */
+/* { dg-additional-options "--param=riscv-autovec-preference=scalable -fno-vect-cost-model" } */
+
+#include "widen_reduc_order-2.c"
+
+#define RUN(TYPE1, TYPE2, N)                                                   \
+  {                                                                            \
+    TYPE2 a[N];                                                                \
+    TYPE1 r = 0;                                                               \
+    for (int i = 0; i < N; i++) {                                              \
+      a[i] = (i * 0.1) * (i & 1 ? 1 : -1);                                     \
+      r += a[i];                                                               \
+      asm volatile("" ::: "memory");                                           \
+    }                                                                          \
+    if (r != reduc_##TYPE1##_##TYPE2(a))                                       \
+      __builtin_abort();                                                       \
+  }
+
+int __attribute__((optimize(1))) main() {
+  TEST_ALL(RUN)
+  return 0;
+}
diff --git a/gcc/testsuite/gcc.target/riscv/rvv/autovec/widen/widen_reduc_run-1.c b/gcc/testsuite/gcc.target/riscv/rvv/autovec/widen/widen_reduc_run-1.c
new file mode 100644
index 00000000000..d70a652a56a
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/rvv/autovec/widen/widen_reduc_run-1.c
@@ -0,0 +1,22 @@
+/* { dg-do run { target { riscv_vector } } } */
+/* { dg-additional-options "--param=riscv-autovec-preference=scalable -fno-vect-cost-model" } */
+
+#include "widen_reduc-1.c"
+
+#define RUN(TYPE1, TYPE2, N)                                                   \
+  {                                                                            \
+    TYPE2 a[N];                                                                \
+    TYPE1 r = 0;                                                               \
+    for (int i = 0; i < N; i++) {                                              \
+      a[i] = (i * 0.1) * (i & 1 ? 1 : -1);                                     \
+      r += a[i];                                                               \
+      asm volatile("" ::: "memory");                                           \
+    }                                                                          \
+    if (r != reduc_##TYPE1##_##TYPE2(a))                                       \
+      __builtin_abort();                                                       \
+  }
+
+int __attribute__((optimize(1))) main() {
+  TEST_ALL(RUN)
+  return 0;
+}

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2023-09-18 18:26 [gcc(refs/vendors/riscv/heads/gcc-13-with-riscv-opts)] RISC-V: Support combine extend and reduce sum to widen reduce sum Jeff Law

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