[gcc r14-2775] RISC-V: Fixbug for fsflags instruction error using immediate.

[gcc r14-2775] RISC-V: Fixbug for fsflags instruction error using immediate.

[Kito Cheng]

https://gcc.gnu.org/g:ad0dde0af107aaf6a91e37f3aa31249e34df6ce0

commit r14-2775-gad0dde0af107aaf6a91e37f3aa31249e34df6ce0
Author: Jin Ma <jinma@linux.alibaba.com>
Date:   Wed Jul 26 13:41:04 2023 +0800

    RISC-V: Fixbug for fsflags instruction error using immediate.
    
    The pattern mistakenly believes that fsflags can use immediate numbers,
    but in fact it does not support it. Immediate numbers should use fsflagsi.
    
    For example:
    __builtin_riscv_fsflags(4);
    
    The following error occurred.
    /tmp/ccoWdWqT.s: Assembler messages:
    /tmp/ccoWdWqT.s:14: Error: illegal operands `fsflags 4'
    
    gcc/ChangeLog:
    
            * config/riscv/riscv.md: Likewise.
    
    gcc/testsuite/ChangeLog:
    
            * gcc.target/riscv/fsflags.c: New test.

Diff:
---
 gcc/config/riscv/riscv.md                |  4 ++--
 gcc/testsuite/gcc.target/riscv/fsflags.c | 16 ++++++++++++++++
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/gcc/config/riscv/riscv.md b/gcc/config/riscv/riscv.md
index 4615e811947..24515bcf706 100644
--- a/gcc/config/riscv/riscv.md
+++ b/gcc/config/riscv/riscv.md
@@ -3074,7 +3074,7 @@
   "frcsr\t%0")
 
 (define_insn "riscv_fscsr"
-  [(unspec_volatile [(match_operand:SI 0 "csr_operand" "rK")] UNSPECV_FSCSR)]
+  [(unspec_volatile [(match_operand:SI 0 "register_operand" "r")] UNSPECV_FSCSR)]
   "TARGET_HARD_FLOAT || TARGET_ZFINX"
   "fscsr\t%0")
 
@@ -3087,7 +3087,7 @@
 (define_insn "riscv_fsflags"
   [(unspec_volatile [(match_operand:SI 0 "csr_operand" "rK")] UNSPECV_FSFLAGS)]
   "TARGET_HARD_FLOAT || TARGET_ZFINX"
-  "fsflags\t%0")
+  "fsflags%i0\t%0")
 
 (define_insn "*riscv_fsnvsnan<mode>2"
   [(unspec_volatile [(match_operand:ANYF 0 "register_operand" "f")
diff --git a/gcc/testsuite/gcc.target/riscv/fsflags.c b/gcc/testsuite/gcc.target/riscv/fsflags.c
new file mode 100644
index 00000000000..74a97b8a7c7
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/fsflags.c
@@ -0,0 +1,16 @@
+/* Verify that fsflags is using the correct register or immediate.  */
+/* { dg-do compile } */
+/* { dg-require-effective-target hard_float } */
+/* { dg-options "-O" } */
+
+void foo1 (int a)
+{
+   __builtin_riscv_fsflags(a);
+}
+void foo2 ()
+{
+   __builtin_riscv_fsflags(4);
+}
+
+/* { dg-final { scan-assembler-times "fsflags\t" 1 } } */
+/* { dg-final { scan-assembler-times "fsflagsi\t" 1 } } */