[gcc r13-5678] RISC-V: Remove unnecessary register class.

[Kito Cheng <kito@gcc.gnu.org>]

https://gcc.gnu.org/g:167b04b9b8a2becfd23b8ccf7f09016bbd013e12

commit r13-5678-g167b04b9b8a2becfd23b8ccf7f09016bbd013e12
Author: Monk Chiang <monk.chiang@sifive.com>
Date:   Fri Feb 3 12:58:51 2023 +0800

    RISC-V: Remove unnecessary register class.
    
    Avoid VL_REGS, VTYPE_REGS join register allocation.
    
    gcc/ChangeLog:
    
            * config/riscv/riscv.h: Remove VL_REGS, VTYPE_REGS class.
            * config/riscv/riscv.cc: Ditto.

Diff:
---
 gcc/config/riscv/riscv.cc | 8 +-------
 gcc/config/riscv/riscv.h  | 8 +-------
 2 files changed, 2 insertions(+), 14 deletions(-)

diff --git a/gcc/config/riscv/riscv.cc b/gcc/config/riscv/riscv.cc
index 209d9a53e7b..3b7804b7501 100644
--- a/gcc/config/riscv/riscv.cc
+++ b/gcc/config/riscv/riscv.cc
@@ -293,7 +293,7 @@ const enum reg_class riscv_regno_to_class[FIRST_PSEUDO_REGISTER] = {
   FP_REGS,	FP_REGS,	FP_REGS,	FP_REGS,
   FP_REGS,	FP_REGS,	FP_REGS,	FP_REGS,
   FP_REGS,	FP_REGS,	FP_REGS,	FP_REGS,
-  FRAME_REGS,	FRAME_REGS,	VL_REGS,	VTYPE_REGS,
+  FRAME_REGS,	FRAME_REGS,	NO_REGS,	NO_REGS,
   NO_REGS,	NO_REGS,	NO_REGS,	NO_REGS,
   NO_REGS,	NO_REGS,	NO_REGS,	NO_REGS,
   NO_REGS,	NO_REGS,	NO_REGS,	NO_REGS,
@@ -5831,12 +5831,6 @@ riscv_class_max_nregs (reg_class_t rclass, machine_mode mode)
   if (reg_class_subset_p (rclass, V_REGS))
     return riscv_hard_regno_nregs (V_REG_FIRST, mode);
 
-  if (reg_class_subset_p (rclass, VL_REGS))
-    return 1;
-
-  if (reg_class_subset_p (rclass, VTYPE_REGS))
-    return 1;
-
   return 0;
 }
 
diff --git a/gcc/config/riscv/riscv.h b/gcc/config/riscv/riscv.h
index 0ab739bd6eb..faffd5a77fe 100644
--- a/gcc/config/riscv/riscv.h
+++ b/gcc/config/riscv/riscv.h
@@ -462,8 +462,6 @@ enum reg_class
   GR_REGS,			/* integer registers */
   FP_REGS,			/* floating-point registers */
   FRAME_REGS,			/* arg pointer and frame pointer */
-  VL_REGS,			/* vl register */
-  VTYPE_REGS,			/* vtype register */
   VM_REGS,			/* v0.t registers */
   VD_REGS,			/* vector registers except v0.t */
   V_REGS,			/* vector registers */
@@ -487,8 +485,6 @@ enum reg_class
   "GR_REGS",								\
   "FP_REGS",								\
   "FRAME_REGS",								\
-  "VL_REGS",								\
-  "VTYPE_REGS",								\
   "VM_REGS",								\
   "VD_REGS",								\
   "V_REGS",								\
@@ -514,12 +510,10 @@ enum reg_class
   { 0xffffffff, 0x00000000, 0x00000000, 0x00000000 },	/* GR_REGS */		\
   { 0x00000000, 0xffffffff, 0x00000000, 0x00000000 },	/* FP_REGS */		\
   { 0x00000000, 0x00000000, 0x00000003, 0x00000000 },	/* FRAME_REGS */	\
-  { 0x00000000, 0x00000000, 0x00000004, 0x00000000 },	/* VL_REGS */		\
-  { 0x00000000, 0x00000000, 0x00000008, 0x00000000 },	/* VTYPE_REGS */	\
   { 0x00000000, 0x00000000, 0x00000000, 0x00000001 },	/* V0_REGS */		\
   { 0x00000000, 0x00000000, 0x00000000, 0xfffffffe },	/* VNoV0_REGS */	\
   { 0x00000000, 0x00000000, 0x00000000, 0xffffffff },	/* V_REGS */		\
-  { 0xffffffff, 0xffffffff, 0x0000000f, 0xffffffff }	/* ALL_REGS */		\
+  { 0xffffffff, 0xffffffff, 0x00000003, 0xffffffff }	/* ALL_REGS */		\
 }
 
 /* A C expression whose value is a register class containing hard