[gcc r12-8416] RISC-V: Fix wrong expansion for arch-canonicalize

[gcc r12-8416] RISC-V: Fix wrong expansion for arch-canonicalize

[Kito Cheng]

https://gcc.gnu.org/g:02e8dea4944f9995ed3623dc15c2ad73e0376f27

commit r12-8416-g02e8dea4944f9995ed3623dc15c2ad73e0376f27
Author: Kito Cheng <kito.cheng@sifive.com>
Date:   Mon May 9 11:44:30 2022 +0800

    RISC-V: Fix wrong expansion for arch-canonicalize
    
    rv64gcv should exapnd into:
    
    rv64imafdcv_zicsr_zifencei_zve32f_zve32x_zve64d_zve64f_zve64x_zvl128b_zvl32b_zvl64b
    
    but we exapnd fd twice for now:
    
    rv64imafdfdcv_zicsr_zifencei_zve32f_zve32x_zve64d_zve64f_zve64x_zvl128b_zvl32b_zvl64b
    
    gcc/ChangeLog:
    
            * config/riscv/arch-canonicalize: Handle g correctly.
    
    (cherry picked from commit 27239e13b1ba383e2706231917062aa6e14150a8)

Diff:
---
 gcc/config/riscv/arch-canonicalize | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/gcc/config/riscv/arch-canonicalize b/gcc/config/riscv/arch-canonicalize
index f36a2ca4593..41bab69193c 100755
--- a/gcc/config/riscv/arch-canonicalize
+++ b/gcc/config/riscv/arch-canonicalize
@@ -70,8 +70,10 @@ def arch_canonicalize(arch, isa_spec):
   is_isa_spec_2p2 = isa_spec == '2.2'
   new_arch = ""
   extra_long_ext = []
+  std_exts = []
   if arch[:5] in ['rv32e', 'rv32i', 'rv32g', 'rv64i', 'rv64g']:
-    new_arch = arch[:5].replace("g", "imafd")
+    new_arch = arch[:5].replace("g", "i")
+    std_exts = ['m', 'a', 'f', 'd']
     if arch[:5] in ['rv32g', 'rv64g']:
       if not is_isa_spec_2p2:
         extra_long_ext = ['zicsr', 'zifencei']
@@ -86,10 +88,10 @@ def arch_canonicalize(arch, isa_spec):
   if long_ext_prefixes_idx:
     first_long_ext_idx = min(long_ext_prefixes_idx)
     long_exts = arch[first_long_ext_idx:].split("_")
-    std_exts = list(arch[5:first_long_ext_idx])
+    std_exts += list(arch[5:first_long_ext_idx])
   else:
     long_exts = []
-    std_exts = list(arch[5:])
+    std_exts += list(arch[5:])
 
   long_exts += extra_long_ext