Bernd Schmidt <ber...@codesourcery.com> writes:
> @@ -10227,17 +10236,30 @@ mips_expand_prologue (void)
> emit_insn (gen_blockage ());
> }
>
> -/* Emit instructions to restore register REG from slot MEM. */
> +/* Emit instructions to restore register REG from slot MEM. Also update
> + the cfa_restores list. */
>
> static void
> mips_restore_reg (rtx reg, rtx mem)
> {
> + rtx orig_reg = reg;
> + rtx last;
> +
> /* There's no MIPS16 instruction to load $31 directly. Load into
> $7 instead and adjust the return insn appropriately. */
> if (TARGET_MIPS16 && REGNO (reg) == RETURN_ADDR_REGNUM)
> reg = gen_rtx_REG (GET_MODE (reg), GP_REG_FIRST + 7);
>
> mips_emit_save_slot_move (reg, mem, MIPS_EPILOGUE_TEMP (GET_MODE (reg)));
> + if (reg == orig_reg)
> + cfa_restores = alloc_reg_note (REG_CFA_RESTORE, reg, cfa_restores);
> +
> + if (!frame_pointer_needed || REGNO (reg) != HARD_FRAME_POINTER_REGNUM)
> + return;
> + last = get_last_insn ();
> + add_reg_note (last, REG_CFA_DEF_CFA, plus_constant (stack_pointer_rtx,
> + cfa_sp_offset));
> + RTX_FRAME_RELATED_P (last) = 1;
I suppose I still don't get why this is OK but this:
> @@ -10324,12 +10350,26 @@ mips_expand_epilogue (bool sibcall_p)
> if (!TARGET_MIPS16)
> target = stack_pointer_rtx;
>
> - emit_insn (gen_add3_insn (target, base, adjust));
> + insn = emit_insn (gen_add3_insn (target, base, adjust));
> + if (!frame_pointer_needed && target == stack_pointer_rtx)
> + {
> + RTX_FRAME_RELATED_P (insn) = 1;
> + add_reg_note (insn, REG_CFA_DEF_CFA,
> + plus_constant (stack_pointer_rtx, step2));
> + }
triggered ICEs without the !frame_pointer_required. I think I need
to play around with it a bit before I understand enough to review.
I'll try to find time this weekend.
Also, this:
@@ -10442,7 +10495,7 @@ mips_expand_epilogue (bool sibcall_p)
}
else
{
- unsigned int regno;
+ rtx pat;
/* When generating MIPS16 code, the normal
mips_for_each_saved_gpr_and_fpr path will restore the return
@@ -10450,11 +10503,16 @@ mips_expand_epilogue (bool sibcall_p)
if (TARGET_MIPS16
&& !GENERATE_MIPS16E_SAVE_RESTORE
&& BITSET_P (frame->mask, RETURN_ADDR_REGNUM))
- regno = GP_REG_FIRST + 7;
+ {
+ rtx reg = gen_rtx_REG (Pmode, GP_REG_FIRST + 7);
+ pat = gen_return_internal (reg);
+ }
else
- regno = RETURN_ADDR_REGNUM;
- emit_jump_insn (gen_simple_return_internal (gen_rtx_REG (Pmode,
- regno)));
+ {
+ rtx reg = gen_rtx_REG (Pmode, RETURN_ADDR_REGNUM);
+ pat = gen_simple_return_internal (reg);
+ }
+ emit_jump_insn (pat);
}
}
looks like a logically separate change. I'm not sure I understand
why it's needed: both returns are simple returns in the rtx sense.
Sorry for being awkward here :-(
Richard
