RISC-V: Change vsetvl tail and mask policy to default policy

This patch change the vsetvl policy to default policy
(returned by get_prefer_mask_policy and get_prefer_tail_policy) instead
fixed policy. Any policy is now returned, allowing change to agnostic
or undisturbed. In the future, users may be able to control the default
policy, such as keeping agnostic by compiler options.

gcc/ChangeLog:

	* config/riscv/riscv-protos.h (IS_AGNOSTIC): Move to here.
	* config/riscv/riscv-v.cc (gen_no_side_effects_vsetvl_rtx):
	Change to default policy.
	* config/riscv/riscv-vector-builtins-bases.cc: Change to default policy.
	* config/riscv/riscv-vsetvl.h (IS_AGNOSTIC): Delete.
	* config/riscv/riscv.cc (riscv_print_operand): Use IS_AGNOSTIC to test.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/rvv/base/binop_vx_constraint-171.c: Adjust.
	* gcc.target/riscv/rvv/base/binop_vx_constraint-173.c: Adjust.
	* gcc.target/riscv/rvv/vsetvl/vsetvl-24.c: New test.

8 files changed, 26 insertions, 13 deletions

diff --git a/gcc/config/riscv/riscv-protos.h b/gcc/config/riscv/riscv-protos.h
index 92e30a1..e145ee6 100644
--- a/gcc/config/riscv/riscv-protos.h
+++ b/gcc/config/riscv/riscv-protos.h
@@ -406,6 +406,9 @@ enum mask_policy
   MASK_ANY = 2,
 };
 
+/* Return true if VALUE is agnostic or any policy.  */
+#define IS_AGNOSTIC(VALUE) (bool) (VALUE & 0x1 || (VALUE >> 1 & 0x1))
+
 enum class reduction_type
 {
   UNORDERED,
diff --git a/gcc/config/riscv/riscv-v.cc b/gcc/config/riscv/riscv-v.cc
index 4277001..6228ff3 100644
--- a/gcc/config/riscv/riscv-v.cc
+++ b/gcc/config/riscv/riscv-v.cc
@@ -1672,9 +1672,11 @@ static rtx
 gen_no_side_effects_vsetvl_rtx (machine_mode vmode, rtx vl, rtx avl)
 {
   unsigned int sew = get_sew (vmode);
+  rtx tail_policy = gen_int_mode (get_prefer_tail_policy (), Pmode);
+  rtx mask_policy = gen_int_mode (get_prefer_mask_policy (), Pmode);
   return gen_vsetvl_no_side_effects (Pmode, vl, avl, gen_int_mode (sew, Pmode),
 				     gen_int_mode (get_vlmul (vmode), Pmode),
-				     const0_rtx, const0_rtx);
+				     tail_policy, mask_policy);
 }
 
 /* GET VL * 2 rtx.  */
diff --git a/gcc/config/riscv/riscv-vector-builtins-bases.cc b/gcc/config/riscv/riscv-vector-builtins-bases.cc
index 54582ee..8e679f7 100644
--- a/gcc/config/riscv/riscv-vector-builtins-bases.cc
+++ b/gcc/config/riscv/riscv-vector-builtins-bases.cc
@@ -139,11 +139,11 @@ public:
     /* LMUL.  */
     e.add_input_operand (Pmode, gen_int_mode (get_vlmul (mode), Pmode));
 
-    /* TA.  */
-    e.add_input_operand (Pmode, gen_int_mode (1, Pmode));
+    /* TAIL_ANY.  */
+    e.add_input_operand (Pmode, gen_int_mode (get_prefer_tail_policy (), Pmode));
 
-    /* MU.  */
-    e.add_input_operand (Pmode, gen_int_mode (0, Pmode));
+    /* MASK_ANY.  */
+    e.add_input_operand (Pmode, gen_int_mode (get_prefer_mask_policy (), Pmode));
     return e.generate_insn (code_for_vsetvl_no_side_effects (Pmode));
   }
 };
diff --git a/gcc/config/riscv/riscv-vsetvl.h b/gcc/config/riscv/riscv-vsetvl.h
index 2a315e4..53549ab 100644
--- a/gcc/config/riscv/riscv-vsetvl.h
+++ b/gcc/config/riscv/riscv-vsetvl.h
@@ -21,8 +21,6 @@ along with GCC; see the file COPYING3.  If not see
 #ifndef GCC_RISCV_VSETVL_H
 #define GCC_RISCV_VSETVL_H
 
-#define IS_AGNOSTIC(VALUE) (bool) (VALUE & 0x1 || (VALUE >> 1 & 0x1))
-
 namespace riscv_vector {
 
 /* Classification of vsetvl instruction.  */
diff --git a/gcc/config/riscv/riscv.cc b/gcc/config/riscv/riscv.cc
index d84fa23..8bca807 100644
--- a/gcc/config/riscv/riscv.cc
+++ b/gcc/config/riscv/riscv.cc
@@ -5246,8 +5246,7 @@ riscv_print_operand (FILE *file, rtx op, int letter)
 	else if (code == CONST_INT)
 	  {
 	    /* Tail && Mask policy.  */
-	    bool agnostic_p = UINTVAL (op) & 0x1;
-	    asm_fprintf (file, "%s", agnostic_p ? "a" : "u");
+	    asm_fprintf (file, "%s", IS_AGNOSTIC (UINTVAL (op)) ? "a" : "u");
 	  }
 	else
 	  output_operand_lossage ("invalid vector constant");
diff --git a/gcc/testsuite/gcc.target/riscv/rvv/base/binop_vx_constraint-171.c b/gcc/testsuite/gcc.target/riscv/rvv/base/binop_vx_constraint-171.c
index dae5eff..6e8669a 100644
--- a/gcc/testsuite/gcc.target/riscv/rvv/base/binop_vx_constraint-171.c
+++ b/gcc/testsuite/gcc.target/riscv/rvv/base/binop_vx_constraint-171.c
@@ -7,7 +7,7 @@
 /*
 ** f1:
 **  ...
-**	vsetivli\t[a-x0-9]+,\s*4,e64,m1,tu,m[au]
+**	vsetivli\t[a-x0-9]+,\s*4,e64,m1,t[au],m[au]
 **  ...
 **	vsetvli\tzero,\s*[a-x0-9]+,e32,m1,tu,m[au]
 **  ...
@@ -41,7 +41,7 @@ void f1 (void * in, void *out, int64_t x, int n)
 /*
 ** f2:
 **  ...
-**	vsetivli\t[a-x0-9]+,\s*4,e64,m1,tu,m[au]
+**	vsetivli\t[a-x0-9]+,\s*4,e64,m1,t[au],m[au]
 **  ...
 **	vsetvli\tzero,\s*[a-x0-9]+,e32,m1,tu,m[au]
 **  ...
diff --git a/gcc/testsuite/gcc.target/riscv/rvv/base/binop_vx_constraint-173.c b/gcc/testsuite/gcc.target/riscv/rvv/base/binop_vx_constraint-173.c
index 0d5a260..af9c45e 100644
--- a/gcc/testsuite/gcc.target/riscv/rvv/base/binop_vx_constraint-173.c
+++ b/gcc/testsuite/gcc.target/riscv/rvv/base/binop_vx_constraint-173.c
@@ -7,7 +7,7 @@
 /*
 ** f1:
 **  ...
-**	vsetvli\t[a-x0-9]+,\s*[a-x0-9]+,e64,m1,tu,m[au]
+**	vsetvli\t[a-x0-9]+,\s*[a-x0-9]+,e64,m1,t[au],m[au]
 **  ...
 **	vsetvli\tzero,\s*[a-x0-9]+,e32,m1,tu,m[au]
 **  ...
@@ -41,7 +41,7 @@ void f1 (void * in, void *out, int64_t x, int vl)
 /*
 ** f2:
 **  ...
-**	vsetvli\t[a-x0-9]+,\s*[a-x0-9]+,e64,m1,tu,m[au]
+**	vsetvli\t[a-x0-9]+,\s*[a-x0-9]+,e64,m1,t[au],m[au]
 **  ...
 **	vsetvli\tzero,\s*[a-x0-9]+,e32,m1,tu,m[au]
 **  ...
diff --git a/gcc/testsuite/gcc.target/riscv/rvv/vsetvl/vsetvl-24.c b/gcc/testsuite/gcc.target/riscv/rvv/vsetvl/vsetvl-24.c
new file mode 100644
index 0000000..1703c73
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/rvv/vsetvl/vsetvl-24.c
@@ -0,0 +1,11 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv64gcv -mabi=lp64d" } */
+
+#include <riscv_vector.h>
+
+size_t foo ()
+{
+    return __riscv_vsetvlmax_e8m1 ();
+}
+
+/* { dg-final { scan-assembler-times {\tvsetvli\t[a-x0-9]+,zero,e8,m1,ta,ma} 1 } } */