Some square brackets were missing escape characters, causing DejaGnu to
try and call a proc with the name "at".

gcc/testsuite/ChangeLog:

        * gcc.target/riscv/read-thread-pointer.c: Fix escaping on
        regular expression.
---
 gcc/testsuite/gcc.target/riscv/read-thread-pointer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/testsuite/gcc.target/riscv/read-thread-pointer.c
b/gcc/testsuite/gcc.target/riscv/read-thread-pointer.c
index 760f8eafb40..401fb421129 100644
--- a/gcc/testsuite/gcc.target/riscv/read-thread-pointer.c
+++ b/gcc/testsuite/gcc.target/riscv/read-thread-pointer.c
@@ -4,4 +4,4 @@ void *get_tp()
 {
     return __builtin_thread_pointer ();
 }
-/* { dg-final { scan-assembler "mv\[ \t\]*[at][0-9]+,tp" } } */
+/* { dg-final { scan-assembler "mv\[ \t\]*\[at\]\[0-9\]+,tp" } } */
--
2.17.1

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