[patch,avr,applied] Take into account -mtiny-stack in frame pointer adjustments

[Georg-Johann Lay]

Applied this addendum to avr PR114100:

When the frame pointer is adjusted and -mtiny-stack is set,
then it is enough to adjust the low part of the frame pointer.
Johann

--

AVR: target/114100 - Factor in -mtiny-stack in frame pointer adjustments

gcc/
        PR target/114100
        * config/avr/avr.cc (avr_out_plus_1) [-mtiny-stack]: Only adjust
        the low part of the frame pointer with 8-bit stack pointer.


diff --git a/gcc/config/avr/avr.cc b/gcc/config/avr/avr.cc
index 94ef7c591a9..d39d6707c97 100644
--- a/gcc/config/avr/avr.cc
+++ b/gcc/config/avr/avr.cc
@@ -8983,14 +8983,17 @@ avr_out_plus_1 (rtx *xop, int *plen, enum 
rtx_code code, int *pcc,
          && frame_pointer_needed
          && REGNO (xop[0]) == FRAME_POINTER_REGNUM)
        {
-         rtx xval16 = simplify_gen_subreg (HImode, xval, imode, i);
-         if (xval16 == const1_rtx || xval16 == constm1_rtx)
+         if (AVR_HAVE_8BIT_SP)
+           {
+             avr_asm_len ("subi %A0,%n2", xop, plen, 1);
+             return;
+           }
+         else if (xop[2] == const1_rtx || xop[2] == constm1_rtx)
            {
-             avr_asm_len ((code == PLUS) == (xval16 == const1_rtx)
+             avr_asm_len (xop[2] == const1_rtx
                           ? "ld __tmp_reg__,%a0+"
                           : "ld __tmp_reg__,-%a0", xop, plen, 1);
-             i++;
-             continue;
+             return;
            }
        }