RISC-V: Support one more overlap for wv instructions

For 'wv' instructions, e.g. vwadd.wv vd,vs2,vs1.

vs2 has same EEW as vd.
vs1 has smaller than vd.

So, vs2 can overlap with vd, but vs1 can only overlap highest-number of vd
when LMUL of vs1 is greater than 1.

We already have supported overlap for vs1 LMUL >= 1.
But I forget vs1 LMUL < 1, vs2 can overlap vd even though vs1 totally can not overlap vd.

Consider the reduction auto-vectorization:

int64_t
reduc_plus_int (int *__restrict a, int n)
{
  int64_t r = 0;
  for (int i = 0; i < n; ++i)
    r += a[i];
  return r;
}

When we use --param=riscv-autovec-lmul=m2, the codegen is good to us because we already supported
overlap for source EEW32 LMUL1 -> dest EEW64 LMUL2.

--param=riscv-autovec-lmul=m2:

reduc_plus_int:
        ble     a1,zero,.L4
        vsetvli a5,zero,e64,m2,ta,ma
        vmv.v.i v2,0
.L3:
        vsetvli a5,a1,e32,m1,tu,ma
        slli    a4,a5,2
        sub     a1,a1,a5
        vle32.v v1,0(a0)
        add     a0,a0,a4
        vwadd.wv        v2,v2,v1
        bne     a1,zero,.L3
        li      a5,0
        vsetivli        zero,1,e64,m1,ta,ma
        vmv.s.x v1,a5
        vsetvli a5,zero,e64,m2,ta,ma
        vredsum.vs      v2,v2,v1
        vmv.x.s a0,v2
        ret
.L4:
        li      a0,0
        ret

However, default LMUL (--param=riscv-autovec-lmul=m1) generates redundant vmv1r since
it is EEW32 LMUL=MF2 -> EEW64 LMUL = 1

Before this patch:

reduc_plus_int:
        ble     a1,zero,.L4
        vsetvli a5,zero,e64,m1,ta,ma
        vmv.v.i v1,0
.L3:
        vsetvli a5,a1,e32,mf2,tu,ma
        slli    a4,a5,2
        sub     a1,a1,a5
        vle32.v v2,0(a0)
        vmv1r.v v3,v1                  ---->  This should be removed.
        add     a0,a0,a4
        vwadd.wv        v1,v3,v2       ---->  vs2 should be v1
        bne     a1,zero,.L3
        li      a5,0
        vsetivli        zero,1,e64,m1,ta,ma
        vmv.s.x v2,a5
        vsetvli a5,zero,e64,m1,ta,ma
        vredsum.vs      v1,v1,v2
        vmv.x.s a0,v1
        ret
.L4:
        li      a0,0
        ret

After this patch:

reduc_plus_int:
	ble	a1,zero,.L4
	vsetvli	a5,zero,e64,m1,ta,ma
	vmv.v.i	v1,0
.L3:
	vsetvli	a5,a1,e32,mf2,tu,ma
	slli	a4,a5,2
	sub	a1,a1,a5
	vle32.v	v2,0(a0)
	add	a0,a0,a4
	vwadd.wv	v1,v1,v2
	bne	a1,zero,.L3
	li	a5,0
	vsetivli	zero,1,e64,m1,ta,ma
	vmv.s.x	v2,a5
	vsetvli	a5,zero,e64,m1,ta,ma
	vredsum.vs	v1,v1,v2
	vmv.x.s	a0,v1
	ret
.L4:
	li	a0,0
	ret

	PR target/112432

gcc/ChangeLog:

	* config/riscv/riscv.md (none,W21,W42,W84,W43,W86,W87): Add W0.
	(none,W21,W42,W84,W43,W86,W87,W0): Ditto.
	* config/riscv/vector.md: Ditto.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/rvv/base/pr112432-42.c: New test.

3 files changed, 82 insertions, 46 deletions

diff --git a/gcc/config/riscv/riscv.md b/gcc/config/riscv/riscv.md
index eed9971..ee8b71c 100644
--- a/gcc/config/riscv/riscv.md
+++ b/gcc/config/riscv/riscv.md
@@ -503,7 +503,7 @@
 ;; Widening instructions have group-overlap constraints.  Those are only
 ;; valid for certain register-group sizes.  This attribute marks the
 ;; alternatives not matching the required register-group size as disabled.
-(define_attr "group_overlap" "none,W21,W42,W84,W43,W86,W87"
+(define_attr "group_overlap" "none,W21,W42,W84,W43,W86,W87,W0"
   (const_string "none"))
 
 (define_attr "group_overlap_valid" "no,yes"
@@ -524,9 +524,9 @@
 
          ;; According to RVV ISA:
          ;; The destination EEW is greater than the source EEW, the source EMUL is at least 1,
-	 ;; and the overlap is in the highest-numbered part of the destination register group
-	 ;; (e.g., when LMUL=8, vzext.vf4 v0, v6 is legal, but a source of v0, v2, or v4 is not).
-	 ;; So the source operand should have LMUL >= 1.
+         ;; and the overlap is in the highest-numbered part of the destination register group
+         ;; (e.g., when LMUL=8, vzext.vf4 v0, v6 is legal, but a source of v0, v2, or v4 is not).
+         ;; So the source operand should have LMUL >= 1.
          (and (eq_attr "group_overlap" "W43")
 	      (match_test "riscv_get_v_regno_alignment (GET_MODE (operands[0])) != 4
 			   && riscv_get_v_regno_alignment (GET_MODE (operands[3])) >= 1"))
@@ -536,6 +536,12 @@
 	      (match_test "riscv_get_v_regno_alignment (GET_MODE (operands[0])) != 8
 			   && riscv_get_v_regno_alignment (GET_MODE (operands[3])) >= 1"))
 	 (const_string "no")
+
+         ;; W21 supports highest-number overlap for source LMUL = 1.
+         ;; For 'wv' variant, we can also allow wide source operand overlaps dest operand.
+         (and (eq_attr "group_overlap" "W0")
+	      (match_test "riscv_get_v_regno_alignment (GET_MODE (operands[0])) > 1"))
+	 (const_string "no")
         ]
        (const_string "yes")))
 
diff --git a/gcc/config/riscv/vector.md b/gcc/config/riscv/vector.md
index 7646615..f607d76 100644
--- a/gcc/config/riscv/vector.md
+++ b/gcc/config/riscv/vector.md
@@ -3776,48 +3776,48 @@
    (set_attr "group_overlap" "W21,W21,W21,W21,W42,W42,W42,W42,W84,W84,W84,W84,none,none")])
 
 (define_insn "@pred_single_widen_sub<any_extend:su><mode>"
-  [(set (match_operand:VWEXTI 0 "register_operand"             "=vd, vr, vd, vr, vd, vr, vd, vr, vd, vr, vd, vr, ?&vr, ?&vr")
+  [(set (match_operand:VWEXTI 0 "register_operand"                 "=vd, vr, vd, vr, vd, vr, vd, vr, vd, vr, vd, vr,  &vr,  &vr, ?&vr, ?&vr")
 	(if_then_else:VWEXTI
 	  (unspec:<VM>
-	    [(match_operand:<VM> 1 "vector_mask_operand"           " vm,Wc1, vm,Wc1, vm,Wc1, vm,Wc1, vm,Wc1, vm,Wc1,vmWc1,vmWc1")
-	     (match_operand 5 "vector_length_operand"              " rK, rK, rK, rK, rK, rK, rK, rK, rK, rK, rK, rK,   rK,   rK")
-	     (match_operand 6 "const_int_operand"                  "  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,    i,    i")
-	     (match_operand 7 "const_int_operand"                  "  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,    i,    i")
-	     (match_operand 8 "const_int_operand"                  "  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,    i,    i")
+	    [(match_operand:<VM> 1 "vector_mask_operand"           " vm,Wc1, vm,Wc1, vm,Wc1, vm,Wc1, vm,Wc1, vm,Wc1,vmWc1,vmWc1,vmWc1,vmWc1")
+	     (match_operand 5 "vector_length_operand"              " rK, rK, rK, rK, rK, rK, rK, rK, rK, rK, rK, rK,   rK,   rK,   rK,   rK")
+	     (match_operand 6 "const_int_operand"                  "  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,    i,    i,    i,    i")
+	     (match_operand 7 "const_int_operand"                  "  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,    i,    i,    i,    i")
+	     (match_operand 8 "const_int_operand"                  "  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,    i,    i,    i,    i")
 	     (reg:SI VL_REGNUM)
 	     (reg:SI VTYPE_REGNUM)] UNSPEC_VPREDICATE)
 	  (minus:VWEXTI
-	    (match_operand:VWEXTI 3 "register_operand"             " vr, vr, vr, vr, vr, vr, vr, vr, vr, vr, vr, vr,   vr,   vr")
+	    (match_operand:VWEXTI 3 "register_operand"             " vr, vr, vr, vr, vr, vr, vr, vr, vr, vr, vr, vr,    0,    0,   vr,   vr")
 	    (any_extend:VWEXTI
-	      (match_operand:<V_DOUBLE_TRUNC> 4 "register_operand" "W21,W21,W21,W21,W42,W42,W42,W42,W84,W84,W84,W84,   vr,   vr")))
-	  (match_operand:VWEXTI 2 "vector_merge_operand"           " vu, vu,  0,  0, vu, vu,  0,  0, vu, vu,  0,  0,   vu,    0")))]
+	      (match_operand:<V_DOUBLE_TRUNC> 4 "register_operand" "W21,W21,W21,W21,W42,W42,W42,W42,W84,W84,W84,W84,   vr,   vr,   vr,   vr")))
+	  (match_operand:VWEXTI 2 "vector_merge_operand"           " vu, vu,  0,  0, vu, vu,  0,  0, vu, vu,  0,  0,   vu,    0,   vu,    0")))]
   "TARGET_VECTOR"
   "vwsub<any_extend:u>.wv\t%0,%3,%4%p1"
   [(set_attr "type" "viwalu")
    (set_attr "mode" "<V_DOUBLE_TRUNC>")
-   (set_attr "group_overlap" "W21,W21,W21,W21,W42,W42,W42,W42,W84,W84,W84,W84,none,none")])
+   (set_attr "group_overlap" "W21,W21,W21,W21,W42,W42,W42,W42,W84,W84,W84,W84,W0,W0,none,none")])
 
 (define_insn "@pred_single_widen_add<any_extend:su><mode>"
-  [(set (match_operand:VWEXTI 0 "register_operand"             "=vd, vr, vd, vr, vd, vr, vd, vr, vd, vr, vd, vr, ?&vr, ?&vr")
+  [(set (match_operand:VWEXTI 0 "register_operand"                 "=vd, vr, vd, vr, vd, vr, vd, vr, vd, vr, vd, vr,  &vr,  &vr, ?&vr, ?&vr")
 	(if_then_else:VWEXTI
 	  (unspec:<VM>
-	    [(match_operand:<VM> 1 "vector_mask_operand"           " vm,Wc1, vm,Wc1, vm,Wc1, vm,Wc1, vm,Wc1, vm,Wc1,vmWc1,vmWc1")
-	     (match_operand 5 "vector_length_operand"              " rK, rK, rK, rK, rK, rK, rK, rK, rK, rK, rK, rK,   rK,   rK")
-	     (match_operand 6 "const_int_operand"                  "  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,    i,    i")
-	     (match_operand 7 "const_int_operand"                  "  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,    i,    i")
-	     (match_operand 8 "const_int_operand"                  "  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,    i,    i")
+	    [(match_operand:<VM> 1 "vector_mask_operand"           " vm,Wc1, vm,Wc1, vm,Wc1, vm,Wc1, vm,Wc1, vm,Wc1,vmWc1,vmWc1,vmWc1,vmWc1")
+	     (match_operand 5 "vector_length_operand"              " rK, rK, rK, rK, rK, rK, rK, rK, rK, rK, rK, rK,   rK,   rK,   rK,   rK")
+	     (match_operand 6 "const_int_operand"                  "  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,    i,    i,    i,    i")
+	     (match_operand 7 "const_int_operand"                  "  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,    i,    i,    i,    i")
+	     (match_operand 8 "const_int_operand"                  "  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,    i,    i,    i,    i")
 	     (reg:SI VL_REGNUM)
 	     (reg:SI VTYPE_REGNUM)] UNSPEC_VPREDICATE)
 	  (plus:VWEXTI
 	    (any_extend:VWEXTI
-	      (match_operand:<V_DOUBLE_TRUNC> 4 "register_operand" "W21,W21,W21,W21,W42,W42,W42,W42,W84,W84,W84,W84,   vr,   vr"))
-	    (match_operand:VWEXTI 3 "register_operand"             " vr, vr, vr, vr, vr, vr, vr, vr, vr, vr, vr, vr,   vr,   vr"))
-	  (match_operand:VWEXTI 2 "vector_merge_operand"           " vu, vu,  0,  0, vu, vu,  0,  0, vu, vu,  0,  0,   vu,    0")))]
+	      (match_operand:<V_DOUBLE_TRUNC> 4 "register_operand" "W21,W21,W21,W21,W42,W42,W42,W42,W84,W84,W84,W84,   vr,   vr,   vr,   vr"))
+	    (match_operand:VWEXTI 3 "register_operand"             " vr, vr, vr, vr, vr, vr, vr, vr, vr, vr, vr, vr,    0,    0,   vr,   vr"))
+	  (match_operand:VWEXTI 2 "vector_merge_operand"           " vu, vu,  0,  0, vu, vu,  0,  0, vu, vu,  0,  0,   vu,    0,   vu,    0")))]
   "TARGET_VECTOR"
   "vwadd<any_extend:u>.wv\t%0,%3,%4%p1"
   [(set_attr "type" "viwalu")
    (set_attr "mode" "<V_DOUBLE_TRUNC>")
-   (set_attr "group_overlap" "W21,W21,W21,W21,W42,W42,W42,W42,W84,W84,W84,W84,none,none")])
+   (set_attr "group_overlap" "W21,W21,W21,W21,W42,W42,W42,W42,W84,W84,W84,W84,W0,W0,none,none")])
 
 (define_insn "@pred_single_widen_<plus_minus:optab><any_extend:su><mode>_scalar"
   [(set (match_operand:VWEXTI 0 "register_operand"                   "=vr,   vr")
@@ -7056,56 +7056,56 @@
    (set_attr "group_overlap" "W21,W21,W21,W21,W42,W42,W42,W42,W84,W84,W84,W84,none,none")])
 
 (define_insn "@pred_single_widen_add<mode>"
-  [(set (match_operand:VWEXTF 0 "register_operand"             "=vd, vr, vd, vr, vd, vr, vd, vr, vd, vr, vd, vr, ?&vr, ?&vr")
+  [(set (match_operand:VWEXTF 0 "register_operand"                 "=vd, vr, vd, vr, vd, vr, vd, vr, vd, vr, vd, vr,  &vr,  &vr, ?&vr, ?&vr")
 	(if_then_else:VWEXTF
 	  (unspec:<VM>
-	    [(match_operand:<VM> 1 "vector_mask_operand"           " vm,Wc1, vm,Wc1, vm,Wc1, vm,Wc1, vm,Wc1, vm,Wc1,vmWc1,vmWc1")
-	     (match_operand 5 "vector_length_operand"              " rK, rK, rK, rK, rK, rK, rK, rK, rK, rK, rK, rK,   rK,   rK")
-	     (match_operand 6 "const_int_operand"                  "  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,    i,    i")
-	     (match_operand 7 "const_int_operand"                  "  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,    i,    i")
-	     (match_operand 8 "const_int_operand"                  "  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,    i,    i")
-	     (match_operand 9 "const_int_operand"                  "  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,    i,    i")
+	    [(match_operand:<VM> 1 "vector_mask_operand"           " vm,Wc1, vm,Wc1, vm,Wc1, vm,Wc1, vm,Wc1, vm,Wc1,vmWc1,vmWc1,vmWc1,vmWc1")
+	     (match_operand 5 "vector_length_operand"              " rK, rK, rK, rK, rK, rK, rK, rK, rK, rK, rK, rK,   rK,   rK,   rK,   rK")
+	     (match_operand 6 "const_int_operand"                  "  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,    i,    i,    i,    i")
+	     (match_operand 7 "const_int_operand"                  "  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,    i,    i,    i,    i")
+	     (match_operand 8 "const_int_operand"                  "  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,    i,    i,    i,    i")
+	     (match_operand 9 "const_int_operand"                  "  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,    i,    i,    i,    i")
 	     (reg:SI VL_REGNUM)
 	     (reg:SI VTYPE_REGNUM)
 	     (reg:SI FRM_REGNUM)] UNSPEC_VPREDICATE)
 	  (plus:VWEXTF
 	    (float_extend:VWEXTF
-	      (match_operand:<V_DOUBLE_TRUNC> 4 "register_operand" "W21,W21,W21,W21,W42,W42,W42,W42,W84,W84,W84,W84,   vr,   vr"))
-	    (match_operand:VWEXTF 3 "register_operand"             " vr, vr, vr, vr, vr, vr, vr, vr, vr, vr, vr, vr,   vr,   vr"))
-	  (match_operand:VWEXTF 2 "vector_merge_operand"           " vu, vu,  0,  0, vu, vu,  0,  0, vu, vu,  0,  0,   vu,    0")))]
+	      (match_operand:<V_DOUBLE_TRUNC> 4 "register_operand" "W21,W21,W21,W21,W42,W42,W42,W42,W84,W84,W84,W84,   vr,   vr,   vr,   vr"))
+	    (match_operand:VWEXTF 3 "register_operand"             " vr, vr, vr, vr, vr, vr, vr, vr, vr, vr, vr, vr,    0,    0,   vr,   vr"))
+	  (match_operand:VWEXTF 2 "vector_merge_operand"           " vu, vu,  0,  0, vu, vu,  0,  0, vu, vu,  0,  0,   vu,    0,   vu,    0")))]
   "TARGET_VECTOR"
   "vfwadd.wv\t%0,%3,%4%p1"
   [(set_attr "type" "vfwalu")
    (set_attr "mode" "<V_DOUBLE_TRUNC>")
    (set (attr "frm_mode")
 	(symbol_ref "riscv_vector::get_frm_mode (operands[9])"))
-   (set_attr "group_overlap" "W21,W21,W21,W21,W42,W42,W42,W42,W84,W84,W84,W84,none,none")])
+   (set_attr "group_overlap" "W21,W21,W21,W21,W42,W42,W42,W42,W84,W84,W84,W84,W0,W0,none,none")])
 
 (define_insn "@pred_single_widen_sub<mode>"
-  [(set (match_operand:VWEXTF 0 "register_operand"             "=vd, vr, vd, vr, vd, vr, vd, vr, vd, vr, vd, vr, ?&vr, ?&vr")
+  [(set (match_operand:VWEXTF 0 "register_operand"                 "=vd, vr, vd, vr, vd, vr, vd, vr, vd, vr, vd, vr,  &vr,  &vr, ?&vr, ?&vr")
 	(if_then_else:VWEXTF
 	  (unspec:<VM>
-	    [(match_operand:<VM> 1 "vector_mask_operand"           " vm,Wc1, vm,Wc1, vm,Wc1, vm,Wc1, vm,Wc1, vm,Wc1,vmWc1,vmWc1")
-	     (match_operand 5 "vector_length_operand"              " rK, rK, rK, rK, rK, rK, rK, rK, rK, rK, rK, rK,   rK,   rK")
-	     (match_operand 6 "const_int_operand"                  "  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,    i,    i")
-	     (match_operand 7 "const_int_operand"                  "  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,    i,    i")
-	     (match_operand 8 "const_int_operand"                  "  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,    i,    i")
-	     (match_operand 9 "const_int_operand"                  "  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,    i,    i")
+	    [(match_operand:<VM> 1 "vector_mask_operand"           " vm,Wc1, vm,Wc1, vm,Wc1, vm,Wc1, vm,Wc1, vm,Wc1,vmWc1,vmWc1,vmWc1,vmWc1")
+	     (match_operand 5 "vector_length_operand"              " rK, rK, rK, rK, rK, rK, rK, rK, rK, rK, rK, rK,   rK,   rK,   rK,   rK")
+	     (match_operand 6 "const_int_operand"                  "  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,    i,    i,    i,    i")
+	     (match_operand 7 "const_int_operand"                  "  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,    i,    i,    i,    i")
+	     (match_operand 8 "const_int_operand"                  "  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,    i,    i,    i,    i")
+	     (match_operand 9 "const_int_operand"                  "  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,  i,    i,    i,    i,    i")
 	     (reg:SI VL_REGNUM)
 	     (reg:SI VTYPE_REGNUM)
 	     (reg:SI FRM_REGNUM)] UNSPEC_VPREDICATE)
 	  (minus:VWEXTF
-	    (match_operand:VWEXTF 3 "register_operand"             " vr, vr, vr, vr, vr, vr, vr, vr, vr, vr, vr, vr,   vr,   vr")
+	    (match_operand:VWEXTF 3 "register_operand"             " vr, vr, vr, vr, vr, vr, vr, vr, vr, vr, vr, vr,    0,    0,   vr,   vr")
 	    (float_extend:VWEXTF
-	      (match_operand:<V_DOUBLE_TRUNC> 4 "register_operand" "W21,W21,W21,W21,W42,W42,W42,W42,W84,W84,W84,W84,   vr,   vr")))
-	  (match_operand:VWEXTF 2 "vector_merge_operand"           " vu, vu,  0,  0, vu, vu,  0,  0, vu, vu,  0,  0,   vu,    0")))]
+	      (match_operand:<V_DOUBLE_TRUNC> 4 "register_operand" "W21,W21,W21,W21,W42,W42,W42,W42,W84,W84,W84,W84,   vr,   vr,   vr,   vr")))
+	  (match_operand:VWEXTF 2 "vector_merge_operand"           " vu, vu,  0,  0, vu, vu,  0,  0, vu, vu,  0,  0,   vu,    0,   vu,    0")))]
   "TARGET_VECTOR"
   "vfwsub.wv\t%0,%3,%4%p1"
   [(set_attr "type" "vfwalu")
    (set_attr "mode" "<V_DOUBLE_TRUNC>")
    (set (attr "frm_mode")
 	(symbol_ref "riscv_vector::get_frm_mode (operands[9])"))
-   (set_attr "group_overlap" "W21,W21,W21,W21,W42,W42,W42,W42,W84,W84,W84,W84,none,none")])
+   (set_attr "group_overlap" "W21,W21,W21,W21,W42,W42,W42,W42,W84,W84,W84,W84,W0,W0,none,none")])
 
 (define_insn "@pred_single_widen_<plus_minus:optab><mode>_scalar"
   [(set (match_operand:VWEXTF 0 "register_operand"                   "=vr,   vr")
diff --git a/gcc/testsuite/gcc.target/riscv/rvv/base/pr112432-42.c b/gcc/testsuite/gcc.target/riscv/rvv/base/pr112432-42.c
new file mode 100644
index 0000000..1ee5b20
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/rvv/base/pr112432-42.c
@@ -0,0 +1,30 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv64gcv -mabi=lp64d -O3 -ffast-math" } */
+
+#include <stdint-gcc.h>
+
+int64_t
+reduc_plus_int (int *__restrict a, int n)
+{
+  int64_t r = 0;
+  for (int i = 0; i < n; ++i)
+    r += a[i];
+  return r;
+}
+
+double
+reduc_plus_float (float *__restrict a, int n)
+{
+  double r = 0;
+  for (int i = 0; i < n; ++i)
+    r += a[i];
+  return r;
+}
+
+/* { dg-final { scan-assembler-not {vmv1r} } } */
+/* { dg-final { scan-assembler-not {vmv2r} } } */
+/* { dg-final { scan-assembler-not {vmv4r} } } */
+/* { dg-final { scan-assembler-not {vmv8r} } } */
+/* { dg-final { scan-assembler-not {csrr} } } */
+/* { dg-final { scan-assembler-times {vwadd\.wv} 1 } } */
+/* { dg-final { scan-assembler-times {vfwadd\.wv} 1 } } */