[PATCH 1/2] testsuite: Enable the PR 87600 tests for LoongArch

[Xi Ruoyao]

I'm going to refine a part of the PR 87600 fix which seems triggering
PR 120983 that LoongArch is particularly suffering.  Enable the PR 87600
tests so I'll not regress PR 87600.

gcc/testsuite/ChangeLog:

        PR rtl-optimization/87600
        PR rtl-optimization/120983
        * gcc.dg/pr87600.h [__loongarch__]: Define REG0 and REG1.
        * gcc.dg/pr87600-1.c (dg-do): Add loongarch.
        * gcc.dg/pr87600-2.c (dg-do): Likewise.
---
 gcc/testsuite/gcc.dg/pr87600-1.c | 2 +-
 gcc/testsuite/gcc.dg/pr87600-2.c | 2 +-
 gcc/testsuite/gcc.dg/pr87600.h   | 3 +++
 3 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/gcc/testsuite/gcc.dg/pr87600-1.c b/gcc/testsuite/gcc.dg/pr87600-1.c
index 351795756a3..9d74cadb011 100644
--- a/gcc/testsuite/gcc.dg/pr87600-1.c
+++ b/gcc/testsuite/gcc.dg/pr87600-1.c
@@ -1,5 +1,5 @@
 /* PR rtl-optimization/87600  */
-/* { dg-do compile { target aarch64*-*-* arm*-*-* i?86-*-* powerpc*-*-* 
s390*-*-* x86_64-*-* } } */
+/* { dg-do compile { target aarch64*-*-* arm*-*-* i?86-*-* loongarch*-*-* 
powerpc*-*-* s390*-*-* x86_64-*-* } } */
 /* { dg-options "-O2" } */
 
 #include "pr87600.h"
diff --git a/gcc/testsuite/gcc.dg/pr87600-2.c b/gcc/testsuite/gcc.dg/pr87600-2.c
index e8a9f194b73..808ebe18507 100644
--- a/gcc/testsuite/gcc.dg/pr87600-2.c
+++ b/gcc/testsuite/gcc.dg/pr87600-2.c
@@ -1,5 +1,5 @@
 /* PR rtl-optimization/87600  */
-/* { dg-do compile { target aarch64*-*-* arm*-*-* i?86-*-* powerpc*-*-* 
s390*-*-* x86_64-*-* } } */
+/* { dg-do compile { target aarch64*-*-* arm*-*-* i?86-*-* loongarch*-*-* 
powerpc*-*-* s390*-*-* x86_64-*-* } } */
 /* { dg-options "-O2" } */
 
 #include "pr87600.h"
diff --git a/gcc/testsuite/gcc.dg/pr87600.h b/gcc/testsuite/gcc.dg/pr87600.h
index c89071eb789..29f065e1d05 100644
--- a/gcc/testsuite/gcc.dg/pr87600.h
+++ b/gcc/testsuite/gcc.dg/pr87600.h
@@ -7,6 +7,9 @@
 #elif defined (__i386__)
 # define REG1 "%eax"
 # define REG2 "%edx"
+#elif defined (__loongarch__)
+# define REG1 "$t0"
+# define REG2 "$t1"
 #elif defined (__powerpc__) || defined (__POWERPC__) || defined (__PPC__)
 # define REG1 "r3"
 # define REG2 "r4"
-- 
2.50.0