[PATCH] MIPS: Use Reg0 instead of const0_rtx for TRAP

[YunQiang Su]

MIPSr6 removes condition trap instructions with imm, so the instruction
like `teq $2,imm` will be converted to
  li $at, imm
  teq $2, $at

The current version of Gas cannot detect if imm is zero, and output
  teq $2, $0
Let's do it in GCC.

gcc
        * config/mips/mips.cc(mips_expand_conditional_trap): Use Reg0
        instead of const0_rtx.
---
 gcc/config/mips/mips.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/config/mips/mips.cc b/gcc/config/mips/mips.cc
index 48924116937..ba1e6214656 100644
--- a/gcc/config/mips/mips.cc
+++ b/gcc/config/mips/mips.cc
@@ -6026,7 +6026,7 @@ mips_expand_conditional_trap (rtx comparison)
 
   emit_insn (gen_rtx_TRAP_IF (VOIDmode,
                              gen_rtx_fmt_ee (code, mode, op0, op1),
-                             const0_rtx));
+                             gen_rtx_REG (mode, GP_REG_FIRST)));
 }
 
 /* Initialize *CUM for a call to a function of type FNTYPE.  */
-- 
2.39.3 (Apple Git-146)