[gcc r12-1057] C-SKY: Add instruction "ld.bs".

[gcc r12-1057] C-SKY: Add instruction "ld.bs".

[qu]

https://gcc.gnu.org/g:94079e642d95ba4bcb75354d6cd628a473a94479

commit r12-1057-g94079e642d95ba4bcb75354d6cd628a473a94479
Author: Geng Qi <gengqi@linux.alibaba.com>
Date:   Tue May 25 18:45:25 2021 +0800

    C-SKY: Add instruction "ld.bs".
    
    gcc/
            * config/csky/csky.md (cskyv2_sextend_ldbs): New.
    
    gcc/testsuite/
            * gcc.target/csky/ldbs.c: New.

Diff:
---
 gcc/config/csky/csky.md              | 10 ++++++++++
 gcc/testsuite/gcc.target/csky/ldbs.c | 11 +++++++++++
 2 files changed, 21 insertions(+)

diff --git a/gcc/config/csky/csky.md b/gcc/config/csky/csky.md
index c27d627e183..b980d4c8fcb 100644
--- a/gcc/config/csky/csky.md
+++ b/gcc/config/csky/csky.md
@@ -1533,6 +1533,7 @@
   }"
 )
 
+;; hi -> si
 (define_insn "extendhisi2"
   [(set (match_operand:SI		  0 "register_operand" "=r")
 	(sign_extend:SI (match_operand:HI 1 "register_operand" "r")))]
@@ -1557,6 +1558,15 @@
   "sextb  %0, %1"
 )
 
+(define_insn "*cskyv2_sextend_ldbs"
+  [(set (match_operand:SI		  0 "register_operand" "=r")
+        (sign_extend:SI (match_operand:QI 1 "csky_simple_mem_operand" "m")))]
+  "CSKY_ISA_FEATURE (E2)"
+  "ld.bs\t%0, %1"
+  [(set_attr "length" "4")
+   (set_attr "type" "load")]
+)
+
 ;; qi -> hi
 (define_insn "extendqihi2"
   [(set (match_operand:HI		  0 "register_operand" "=r")
diff --git a/gcc/testsuite/gcc.target/csky/ldbs.c b/gcc/testsuite/gcc.target/csky/ldbs.c
new file mode 100644
index 00000000000..27a02543413
--- /dev/null
+++ b/gcc/testsuite/gcc.target/csky/ldbs.c
@@ -0,0 +1,11 @@
+/* { dg-do compile } */
+/* { dg-skip-if "" { *-*-* } { "-mcpu=ck801" "-march=ck801" } { "*" } } */
+/* { dg-csky-options "-O1" } */
+
+int foo (signed char *pb)
+{
+  return *pb;
+}
+
+/* { dg-final { scan-assembler "ld.bs" } } */
+