RISC-V: allow vx instruction use "zero" as scalar register.

  li a5,0
  vdiv.vx v0,v1,a5 =======> vdiv.vx v0,v1,zero

gcc/ChangeLog:

	* config/riscv/vector.md: use "zero" reg.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/rvv/base/binop_vx_constraint-121.c: New test.

diff --git a/gcc/config/riscv/vector.md b/gcc/config/riscv/vector.md
index 4ab6c28d167045274679c8a31dfaa9dbb9096263..f9c39adb5da78de0c16c0efea74a216c6d553ff7 100644 (file)
--- a/gcc/config/riscv/vector.md
+++ b/gcc/config/riscv/vector.md
@@ -1247,11 +1247,11 @@
             (reg:SI VTYPE_REGNUM)] UNSPEC_VPREDICATE)
          (any_commutative_binop:VI_QHS
            (vec_duplicate:VI_QHS
-             (match_operand:<VEL> 4 "register_operand"  "  r,  r"))
+             (match_operand:<VEL> 4 "reg_or_0_operand"  " rJ, rJ"))
            (match_operand:VI_QHS 3 "register_operand"   " vr, vr"))
          (match_operand:VI_QHS 2 "vector_merge_operand" "0vu,0vu")))]
   "TARGET_VECTOR"
-  "v<insn>.vx\t%0,%3,%4%p1"
+  "v<insn>.vx\t%0,%3,%z4%p1"
   [(set_attr "type" "<int_binop_insn_type>")
    (set_attr "mode" "<MODE>")])
 
@@ -1269,10 +1269,10 @@
          (any_non_commutative_binop:VI_QHS
            (match_operand:VI_QHS 3 "register_operand"   " vr, vr")
            (vec_duplicate:VI_QHS
-             (match_operand:<VEL> 4 "register_operand"  "  r,  r")))
+             (match_operand:<VEL> 4 "reg_or_0_operand"  " rJ, rJ")))
          (match_operand:VI_QHS 2 "vector_merge_operand" "0vu,0vu")))]
   "TARGET_VECTOR"
-  "v<insn>.vx\t%0,%3,%4%p1"
+  "v<insn>.vx\t%0,%3,%z4%p1"
   [(set_attr "type" "<int_binop_insn_type>")
    (set_attr "mode" "<MODE>")])
 
@@ -1324,8 +1324,11 @@
        rtx v = gen_reg_rtx (<MODE>mode);
 
        if (riscv_vector::simm32_p (operands[4]))
-         operands[4] = gen_rtx_SIGN_EXTEND (<VEL>mode,
-               force_reg (Pmode, operands[4]));
+         {
+           if (!rtx_equal_p (operands[4], const0_rtx))
+             operands[4] = force_reg (Pmode, operands[4]);
+           operands[4] = gen_rtx_SIGN_EXTEND (<VEL>mode, operands[4]);
+         }
        else
          {
            if (CONST_INT_P (operands[4]))
@@ -1356,11 +1359,11 @@
             (reg:SI VTYPE_REGNUM)] UNSPEC_VPREDICATE)
          (any_commutative_binop:VI_D
            (vec_duplicate:VI_D
-             (match_operand:<VEL> 4 "register_operand"  "  r,  r"))
+             (match_operand:<VEL> 4 "reg_or_0_operand"  " rJ, rJ"))
            (match_operand:VI_D 3 "register_operand"     " vr, vr"))
          (match_operand:VI_D 2 "vector_merge_operand"   "0vu,0vu")))]
   "TARGET_VECTOR"
-  "v<insn>.vx\t%0,%3,%4%p1"
+  "v<insn>.vx\t%0,%3,%z4%p1"
   [(set_attr "type" "<int_binop_insn_type>")
    (set_attr "mode" "<MODE>")])
 
@@ -1378,11 +1381,11 @@
          (any_commutative_binop:VI_D
            (vec_duplicate:VI_D
              (sign_extend:<VEL>
-               (match_operand:<VSUBEL> 4 "register_operand" "  r,  r")))
+               (match_operand:<VSUBEL> 4 "reg_or_0_operand" " rJ, rJ")))
            (match_operand:VI_D 3 "register_operand"         " vr, vr"))
          (match_operand:VI_D 2 "vector_merge_operand"       "0vu,0vu")))]
   "TARGET_VECTOR"
-  "v<insn>.vx\t%0,%3,%4%p1"
+  "v<insn>.vx\t%0,%3,%z4%p1"
   [(set_attr "type" "<int_binop_insn_type>")
    (set_attr "mode" "<MODE>")])
 
@@ -1411,8 +1414,11 @@
        rtx v = gen_reg_rtx (<MODE>mode);
 
        if (riscv_vector::simm32_p (operands[4]))
-         operands[4] = gen_rtx_SIGN_EXTEND (<VEL>mode,
-               force_reg (Pmode, operands[4]));
+         {
+           if (!rtx_equal_p (operands[4], const0_rtx))
+             operands[4] = force_reg (Pmode, operands[4]);
+           operands[4] = gen_rtx_SIGN_EXTEND (<VEL>mode, operands[4]);
+         }
        else
          {
            if (CONST_INT_P (operands[4]))
@@ -1444,10 +1450,10 @@
          (any_non_commutative_binop:VI_D
            (match_operand:VI_D 3 "register_operand"     " vr, vr")
            (vec_duplicate:VI_D
-             (match_operand:<VEL> 4 "register_operand"  "  r,  r")))
+             (match_operand:<VEL> 4 "reg_or_0_operand"  " rJ, rJ")))
          (match_operand:VI_D 2 "vector_merge_operand"   "0vu,0vu")))]
   "TARGET_VECTOR"
-  "v<insn>.vx\t%0,%3,%4%p1"
+  "v<insn>.vx\t%0,%3,%z4%p1"
   [(set_attr "type" "<int_binop_insn_type>")
    (set_attr "mode" "<MODE>")])
 
@@ -1466,10 +1472,10 @@
            (match_operand:VI_D 3 "register_operand"         " vr, vr")
            (vec_duplicate:VI_D
              (sign_extend:<VEL>
-               (match_operand:<VSUBEL> 4 "register_operand" "  r,  r"))))
+               (match_operand:<VSUBEL> 4 "reg_or_0_operand" " rJ, rJ"))))
          (match_operand:VI_D 2 "vector_merge_operand"       "0vu,0vu")))]
   "TARGET_VECTOR"
-  "v<insn>.vx\t%0,%3,%4%p1"
+  "v<insn>.vx\t%0,%3,%z4%p1"
   [(set_attr "type" "<int_binop_insn_type>")
    (set_attr "mode" "<MODE>")])
 
@@ -1836,11 +1842,11 @@
             (reg:SI VTYPE_REGNUM)] UNSPEC_VPREDICATE)
          (unspec:VI_QHS
            [(vec_duplicate:VI_QHS
-              (match_operand:<VEL> 4 "register_operand"  "  r,  r"))
+              (match_operand:<VEL> 4 "reg_or_0_operand"  " rJ, rJ"))
             (match_operand:VI_QHS 3 "register_operand"   " vr, vr")] VMULH)
          (match_operand:VI_QHS 2 "vector_merge_operand"  "0vu,0vu")))]
   "TARGET_VECTOR"
-  "vmulh<v_su>.vx\t%0,%3,%4%p1"
+  "vmulh<v_su>.vx\t%0,%3,%z4%p1"
   [(set_attr "type" "vimul")
    (set_attr "mode" "<MODE>")])
 
@@ -1867,8 +1873,11 @@
        rtx v = gen_reg_rtx (<MODE>mode);
 
        if (riscv_vector::simm32_p (operands[4]))
-         operands[4] = gen_rtx_SIGN_EXTEND (<VEL>mode,
-               force_reg (Pmode, operands[4]));
+         {
+           if (!rtx_equal_p (operands[4], const0_rtx))
+             operands[4] = force_reg (Pmode, operands[4]);
+           operands[4] = gen_rtx_SIGN_EXTEND (<VEL>mode, operands[4]);
+         }
        else
          {
            if (CONST_INT_P (operands[4]))
@@ -1899,11 +1908,11 @@
             (reg:SI VTYPE_REGNUM)] UNSPEC_VPREDICATE)
          (unspec:VFULLI_D
            [(vec_duplicate:VFULLI_D
-              (match_operand:<VEL> 4 "register_operand"   "  r,  r"))
+              (match_operand:<VEL> 4 "register_operand"   " rJ, rJ"))
             (match_operand:VFULLI_D 3 "register_operand"  " vr, vr")] VMULH)
          (match_operand:VFULLI_D 2 "vector_merge_operand" "0vu,0vu")))]
   "TARGET_VECTOR"
-  "vmulh<v_su>.vx\t%0,%3,%4%p1"
+  "vmulh<v_su>.vx\t%0,%3,%z4%p1"
   [(set_attr "type" "vimul")
    (set_attr "mode" "<MODE>")])
 
@@ -1921,11 +1930,11 @@
          (unspec:VFULLI_D
            [(vec_duplicate:VFULLI_D
               (sign_extend:<VEL>
-                (match_operand:<VSUBEL> 4 "register_operand" "  r,  r")))
+                (match_operand:<VSUBEL> 4 "reg_or_0_operand" " rJ, rJ")))
             (match_operand:VFULLI_D 3 "register_operand"     " vr, vr")] VMULH)
          (match_operand:VFULLI_D 2 "vector_merge_operand"    "0vu,0vu")))]
   "TARGET_VECTOR"
-  "vmulh<v_su>.vx\t%0,%3,%4%p1"
+  "vmulh<v_su>.vx\t%0,%3,%z4%p1"
   [(set_attr "type" "vimul")
    (set_attr "mode" "<MODE>")])
 

diff --git a/gcc/testsuite/gcc.target/riscv/rvv/base/binop_vx_constraint-121.c b/gcc/testsuite/gcc.target/riscv/rvv/base/binop_vx_constraint-121.c
new file mode 100644 (file)
index 0000000..4d2de91
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/rvv/base/binop_vx_constraint-121.c
@@ -0,0 +1,55 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv32gcv -mabi=ilp32 -O3" } */
+#include "riscv_vector.h"
+
+void f1 (void * in, void *out, int32_t x)
+{
+    vint32m1_t v = __riscv_vle32_v_i32m1 (in, 4);
+    vint32m1_t v2 = __riscv_vle32_v_i32m1_tu (v, in, 4);
+    vint32m1_t v3 = __riscv_vmulh_vx_i32m1 (v2, 0, 4);
+    __riscv_vse32_v_i32m1 (out, v3, 4);
+}
+
+void f2 (void * in, void *out, int32_t x)
+{
+    vint64m1_t v = __riscv_vle64_v_i64m1 (in, 4);
+    vint64m1_t v2 = __riscv_vle64_v_i64m1_tu (v, in, 4);
+    vint64m1_t v3 = __riscv_vmulh_vx_i64m1 (v2, 0, 4);
+    __riscv_vse64_v_i64m1 (out, v3, 4);
+}
+
+void f3 (void * in, void *out, int32_t x)
+{
+    vint32m1_t v = __riscv_vle32_v_i32m1 (in, 4);
+    vint32m1_t v2 = __riscv_vle32_v_i32m1_tu (v, in, 4);
+    vint32m1_t v3 = __riscv_vdiv_vx_i32m1 (v2, 0, 4);
+    __riscv_vse32_v_i32m1 (out, v3, 4);
+}
+
+void f4 (void * in, void *out, int32_t x)
+{
+    vint64m1_t v = __riscv_vle64_v_i64m1 (in, 4);
+    vint64m1_t v2 = __riscv_vle64_v_i64m1_tu (v, in, 4);
+    vint64m1_t v3 = __riscv_vdiv_vx_i64m1 (v2, 0, 4);
+    __riscv_vse64_v_i64m1 (out, v3, 4);
+}
+
+void f5 (void * in, void *out, int32_t x)
+{
+    vint32m1_t v = __riscv_vle32_v_i32m1 (in, 4);
+    vint32m1_t v2 = __riscv_vle32_v_i32m1_tu (v, in, 4);
+    vint32m1_t v3 = __riscv_vrem_vx_i32m1 (v2, 0, 4);
+    __riscv_vse32_v_i32m1 (out, v3, 4);
+}
+
+void f6 (void * in, void *out, int32_t x)
+{
+    vint64m1_t v = __riscv_vle64_v_i64m1 (in, 4);
+    vint64m1_t v2 = __riscv_vle64_v_i64m1_tu (v, in, 4);
+    vint64m1_t v3 = __riscv_vrem_vx_i64m1 (v2, 0, 4);
+    __riscv_vse64_v_i64m1 (out, v3, 4);
+}
+
+/* { dg-final { scan-assembler-times {vmulh\.vx\s+v[0-9]+,\s*v[0-9]+,zero} 2 } } */
+/* { dg-final { scan-assembler-times {vdiv\.vx\s+v[0-9]+,\s*v[0-9]+,zero} 2 } } */
+/* { dg-final { scan-assembler-times {vrem\.vx\s+v[0-9]+,\s*v[0-9]+,zero} 2 } } */