[PATCH] RISC-V: add TARGET_ZBKB to the condition of bswapsi2, bswapdi2 and rotr3 patterns

[Lin Sinan via Gcc-patches]

From: Sinan Lin <sinan....@linux.alibaba.com>

tell gcc that zbkb has these two spn to enable some optimizations. e.g.
1) the rrotate_expr could match to rotrm3 during expand; 2) hook up
__builtin_bswap64 with `rev8` in zbkb64.
---
 gcc/config/riscv/bitmanip.md | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/gcc/config/riscv/bitmanip.md b/gcc/config/riscv/bitmanip.md
index 7aa591689ba..3ed9f5d403a 100644
--- a/gcc/config/riscv/bitmanip.md
+++ b/gcc/config/riscv/bitmanip.md
@@ -297,7 +297,7 @@
   [(set (match_operand:GPR 0 "register_operand")
        (rotatert:GPR (match_operand:GPR 1 "register_operand")
                     (match_operand:QI 2 "arith_operand")))]
-  "TARGET_ZBB || TARGET_XTHEADBB"
+  "TARGET_ZBB || TARGET_XTHEADBB || TARGET_ZBKB"
 {
   if (TARGET_XTHEADBB && !immediate_operand (operands[2], VOIDmode))
     FAIL;
@@ -362,12 +362,12 @@
 (define_expand "bswapdi2"
   [(set (match_operand:DI 0 "register_operand")
        (bswap:DI (match_operand:DI 1 "register_operand")))]
-  "TARGET_64BIT && (TARGET_ZBB || TARGET_XTHEADBB)")
+  "TARGET_64BIT && (TARGET_ZBB || TARGET_XTHEADBB || TARGET_ZBKB)")
 
 (define_expand "bswapsi2"
   [(set (match_operand:SI 0 "register_operand")
        (bswap:SI (match_operand:SI 1 "register_operand")))]
-  "(!TARGET_64BIT && TARGET_ZBB) || TARGET_XTHEADBB")
+  "(!TARGET_64BIT && (TARGET_ZBB || TARGET_ZBKB)) || TARGET_XTHEADBB")
 
 (define_insn "*bswap<mode>2"
   [(set (match_operand:X 0 "register_operand" "=r")
-- 
2.19.1.6.gb485710b