RISC-V: Revert the convert from vmv.s.x to vmv.v.i

Hi,

This patch revert the convert from vmv.s.x to vmv.v.i and add new pattern
optimize the special case when the scalar operand is zero.

Currently, the broadcast pattern where the scalar operand is a imm
will be converted to vmv.v.i from vmv.s.x and the mask operand will be
converted from 00..01 to 11..11. There are some advantages and
disadvantages before and after the conversion after discussing
with Juzhe offline and we chose not to do this transform.

Before:

  Advantages: The vsetvli info required by vmv.s.x has better compatibility since
  vmv.s.x only required SEW and VLEN be zero or one. That mean there
  is more opportunities to combine with other vsetlv infos in vsetvl pass.

  Disadvantages: For non-zero scalar imm, one more `li rd, imm` instruction
  will be needed.

After:

  Advantages: No need `li rd, imm` instruction since vmv.v.i support imm operand.

  Disadvantages: Like before's advantages. Worse compatibility leads to more
  vsetvl instrunctions need.

Consider the bellow C code and asm after autovec.
there is an extra insn (vsetivli zero, 1, e32, m1, ta, ma)
after converted vmv.s.x to vmv.v.i.

```
int foo1(int* restrict a, int* restrict b, int *restrict c, int n) {
    int sum = 0;
    for (int i = 0; i < n; i++)
      sum += a[i] * b[i];

    return sum;
}
```

asm (Before):

```
foo1:
        ble     a3,zero,.L7
        vsetvli a2,zero,e32,m1,ta,ma
        vmv.v.i v1,0
.L6:
        vsetvli a5,a3,e32,m1,tu,ma
        slli    a4,a5,2
        sub     a3,a3,a5
        vle32.v v2,0(a0)
        vle32.v v3,0(a1)
        add     a0,a0,a4
        add     a1,a1,a4
        vmacc.vv        v1,v3,v2
        bne     a3,zero,.L6
        vsetvli a2,zero,e32,m1,ta,ma
        vmv.s.x v2,zero
        vredsum.vs      v1,v1,v2
        vmv.x.s a0,v1
        ret
.L7:
        li      a0,0
        ret
```

asm (After):

```
foo1:
        ble     a3,zero,.L4
        vsetvli a2,zero,e32,m1,ta,ma
        vmv.v.i v1,0
.L3:
        vsetvli a5,a3,e32,m1,tu,ma
        slli    a4,a5,2
        sub     a3,a3,a5
        vle32.v v2,0(a0)
        vle32.v v3,0(a1)
        add     a0,a0,a4
        add     a1,a1,a4
        vmacc.vv        v1,v3,v2
        bne     a3,zero,.L3
        vsetivli        zero,1,e32,m1,ta,ma
        vmv.v.i v2,0
        vsetvli a2,zero,e32,m1,ta,ma
        vredsum.vs      v1,v1,v2
        vmv.x.s a0,v1
        ret
.L4:
        li      a0,0
        ret
```

Best,
Lehua

Co-Authored-By: Ju-Zhe Zhong <juzhe.zhong@rivai.ai>

gcc/ChangeLog:

	* config/riscv/predicates.md (vector_const_0_operand): New.
	* config/riscv/vector.md (*pred_broadcast<mode>_zero): Ditto.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/rvv/base/scalar_move-5.c: Update.
	* gcc.target/riscv/rvv/base/scalar_move-6.c: Ditto.

4 files changed, 70 insertions, 19 deletions

diff --git a/gcc/config/riscv/predicates.md b/gcc/config/riscv/predicates.md
index b6ebdcf..618ad60 100644
--- a/gcc/config/riscv/predicates.md
+++ b/gcc/config/riscv/predicates.md
@@ -292,6 +292,10 @@
   (ior (match_operand 0 "register_operand")
        (match_operand 0 "const_int_operand")))
 
+(define_predicate "vector_const_0_operand"
+  (and (match_code "const_vector")
+       (match_test "satisfies_constraint_Wc0 (op)")))
+
 (define_predicate "vector_move_operand"
   (ior (match_operand 0 "nonimmediate_operand")
        (and (match_code "const_vector")
diff --git a/gcc/config/riscv/vector.md b/gcc/config/riscv/vector.md
index ff84f3f..e772e79 100644
--- a/gcc/config/riscv/vector.md
+++ b/gcc/config/riscv/vector.md
@@ -1728,23 +1728,24 @@
 	  (match_operand:V_VLS 2 "vector_merge_operand")))]
   "TARGET_VECTOR"
 {
-  /* Handle vmv.s.x instruction which has memory scalar.  */
-  if (satisfies_constraint_Wdm (operands[3]) || riscv_vector::simm5_p (operands[3])
-      || rtx_equal_p (operands[3], CONST0_RTX (<VEL>mode)))
+  /* Handle vmv.s.x instruction (Wb1 mask) which has memory scalar.  */
+  if (satisfies_constraint_Wdm (operands[3]))
     {
       if (satisfies_constraint_Wb1 (operands[1]))
-        {
-          // Case 1: vmv.s.x (TA) ==> vlse.v (TA)
-          if (satisfies_constraint_vu (operands[2]))
-            operands[1] = CONSTM1_RTX (<VM>mode);
-          else if (GET_MODE_BITSIZE (<VEL>mode) > GET_MODE_BITSIZE (Pmode))
-            {
-	      // Case 2: vmv.s.x (TU) ==> andi vl + vlse.v (TU) in RV32 system.
+	{
+	  /* Case 1: vmv.s.x (TA, x == memory) ==> vlse.v (TA)  */
+	  if (satisfies_constraint_vu (operands[2]))
+	    operands[1] = CONSTM1_RTX (<VM>mode);
+	  else if (GET_MODE_BITSIZE (<VEL>mode) > GET_MODE_BITSIZE (Pmode))
+	    {
+	      /* Case 2: vmv.s.x (TU, x == memory) ==>
+			   vl = 0 or 1; + vlse.v (TU) in RV32 system  */
 	      operands[4] = riscv_vector::gen_avl_for_scalar_move (operands[4]);
 	      operands[1] = CONSTM1_RTX (<VM>mode);
 	    }
-          else
-            operands[3] = force_reg (<VEL>mode, operands[3]);
+	  else
+	    /* Case 3: load x (memory) to register.  */
+	    operands[3] = force_reg (<VEL>mode, operands[3]);
 	}
     }
   else if (GET_MODE_BITSIZE (<VEL>mode) > GET_MODE_BITSIZE (Pmode)
@@ -1874,6 +1875,24 @@
   [(set_attr "type" "vimov,vimov,vimovxv,vimovxv")
    (set_attr "mode" "<MODE>")])
 
+(define_insn "*pred_broadcast<mode>_zero"
+  [(set (match_operand:V_VLS 0 "register_operand"                          "=vr,    vr")
+    (if_then_else:V_VLS
+      (unspec:<VM>
+        [(match_operand:<VM> 1 "vector_least_significant_set_mask_operand" "Wb1,   Wb1")
+         (match_operand 4 "vector_length_operand"                          " rK,    rK")
+         (match_operand 5 "const_int_operand"                              "  i,     i")
+         (match_operand 6 "const_int_operand"                              "  i,     i")
+         (match_operand 7 "const_int_operand"                              "  i,     i")
+         (reg:SI VL_REGNUM)
+         (reg:SI VTYPE_REGNUM)] UNSPEC_VPREDICATE)
+      (match_operand:V_VLS 3 "vector_const_0_operand"                      "Wc0,   Wc0")
+      (match_operand:V_VLS 2 "vector_merge_operand"                        " vu,     0")))]
+  "TARGET_VECTOR"
+  "vmv.s.x\t%0,zero"
+  [(set_attr "type" "vimovxv,vimovxv")
+   (set_attr "mode" "<MODE>")])
+
 ;; -------------------------------------------------------------------------------
 ;; ---- Predicated Strided loads/stores
 ;; -------------------------------------------------------------------------------
diff --git a/gcc/testsuite/gcc.target/riscv/rvv/base/scalar_move-5.c b/gcc/testsuite/gcc.target/riscv/rvv/base/scalar_move-5.c
index db6800c..2e897a4 100644
--- a/gcc/testsuite/gcc.target/riscv/rvv/base/scalar_move-5.c
+++ b/gcc/testsuite/gcc.target/riscv/rvv/base/scalar_move-5.c
@@ -121,7 +121,7 @@ void foo8 (void *base, void *out, size_t vl, double x)
 /*
 ** foo9:
 ** ...
-** vmv.v.i\tv[0-9]+,\s*-15
+** vmv.s.x\tv[0-9]+,\s*[a-x0-9]+
 ** ...
 ** ret
 */
@@ -150,7 +150,7 @@ void foo10 (void *base, void *out, size_t vl)
 /*
 ** foo11:
 ** ...
-** vmv.v.i\tv[0-9]+,\s*0
+** vmv.s.x\tv[0-9]+,\s*zero
 ** ...
 ** ret
 */
@@ -164,7 +164,7 @@ void foo11 (void *base, void *out, size_t vl)
 /*
 ** foo12:
 ** ...
-** vfmv.s.f\tv[0-9]+,\s*[a-x0-9]+
+** vmv.s.x\tv[0-9]+,\s*zero
 ** ...
 ** ret
 */
@@ -174,3 +174,17 @@ void foo12 (void *base, void *out, size_t vl)
     vfloat64m2_t v = __riscv_vfmv_s_f_f64m2_tu (merge, 0, vl);
     *(vfloat64m2_t*)out = v;
 }
+
+/*
+** foo13:
+** ...
+** vfmv.s.f\tv[0-9]+,\s*[a-x0-9]+
+** ...
+** ret
+*/
+void foo13 (void *base, void *out, size_t vl)
+{
+    vfloat64m2_t merge = *(vfloat64m2_t*) (base + 200);
+    vfloat64m2_t v = __riscv_vfmv_s_f_f64m2_tu (merge, 0.2, vl);
+    *(vfloat64m2_t*)out = v;
+}
diff --git a/gcc/testsuite/gcc.target/riscv/rvv/base/scalar_move-6.c b/gcc/testsuite/gcc.target/riscv/rvv/base/scalar_move-6.c
index f27f85c..326cfd8 100644
--- a/gcc/testsuite/gcc.target/riscv/rvv/base/scalar_move-6.c
+++ b/gcc/testsuite/gcc.target/riscv/rvv/base/scalar_move-6.c
@@ -119,7 +119,7 @@ void foo8 (void *base, void *out, size_t vl, double x)
 /*
 ** foo9:
 ** ...
-** vmv.v.i\tv[0-9]+,\s*-15
+** vmv.s.x\tv[0-9]+,\s*[a-x0-9]+
 ** ...
 ** ret
 */
@@ -133,7 +133,7 @@ void foo9 (void *base, void *out, size_t vl)
 /*
 ** foo10:
 ** ...
-** vmv.v.i\tv[0-9]+,\s*-15
+** vmv.s.x\tv[0-9]+,\s*[a-x0-9]+
 ** ...
 */
 void foo10 (void *base, void *out, size_t vl)
@@ -147,7 +147,7 @@ void foo10 (void *base, void *out, size_t vl)
 /*
 ** foo11:
 ** ...
-** vmv.v.i\tv[0-9]+,\s*0
+** vmv.s.x\tv[0-9]+,\s*zero
 ** ...
 ** ret
 */
@@ -161,7 +161,7 @@ void foo11 (void *base, void *out, size_t vl)
 /*
 ** foo12:
 ** ...
-** vmv.v.i\tv[0-9]+,\s*0
+** vmv.s.x\tv[0-9]+,\s*zero
 ** ...
 ** ret
 */
@@ -173,6 +173,20 @@ void foo12 (void *base, void *out, size_t vl)
 }
 
 /*
+** foo12_1:
+** ...
+** vfmv.s.f\tv[0-9]+,\s*[a-x0-9]+
+** ...
+** ret
+*/
+void foo12_1 (void *base, void *out, size_t vl)
+{
+    vfloat64m2_t merge = *(vfloat64m2_t*) (base + 200);
+    vfloat64m2_t v = __riscv_vfmv_s_f_f64m2_tu (merge, 0.2, vl);
+    *(vfloat64m2_t*)out = v;
+}
+
+/*
 ** foo13:
 ** ...
 ** vmv.s.x\tv[0-9]+,\s*[a-x0-9]+