[PATCH v2 07/14] LoongArch: Fix signed 32-bit overflow for loongarch32 target

[Jiajie Chen via Gcc-patches]

When rhs equals to 0x7fffffff, adding 1 to rhs overflows SI, generating
invalid const_int.

gcc/ChangeLog:

        * config/loongarch/loongarch.cc (loongarch_emit_int_compare):
        Call trunc_int_mode to ensure valid rhs.
---
 gcc/config/loongarch/loongarch.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/gcc/config/loongarch/loongarch.cc 
b/gcc/config/loongarch/loongarch.cc
index c980de98758..49df9509ba9 100644
--- a/gcc/config/loongarch/loongarch.cc
+++ b/gcc/config/loongarch/loongarch.cc
@@ -4284,6 +4284,7 @@ loongarch_emit_int_compare (enum rtx_code *code, rtx 
*op0, rtx *op1)
                break;
 
              new_rhs = rhs + (increment ? 1 : -1);
+             new_rhs = trunc_int_for_mode (new_rhs, GET_MODE (*op0));
              if (loongarch_integer_cost (new_rhs)
                    < loongarch_integer_cost (rhs))
                {
-- 
2.41.0