Thanks Kito.
I will propose V4 and also make a separate patch to fix
riscv_adjust_libcall_cfi_prologue.
BR,
Fei
On 2023-06-05 16:31 Kito Cheng <kito.ch...@gmail.com> wrote:
>
>Only a few minor comments, otherwise LGTM :)
>
>But I guess we need to wait until binutils merge zc stuff.
>
>> Zcmp can share the same logic as save-restore in stack allocation:
>> pre-allocation
>> by cm.push, step 1 and step 2.
>>
>> please be noted cm.push pushes ra, s0-s11 in reverse order than what
>> save-restore does.
>> So adaption has been done in .cfi directives in my patch.
>>
>> Signed-off-by: Fei Gao <gao...@eswincomputing.com>
>>
>> gcc/ChangeLog:
>>
>> * config/riscv/iterators.md (-8): slot offset in bytes
>> (-16): likewise
>> (-24): likewise
>> (-32): likewise
>> (-40): likewise
>> (-48): likewise
>> (-56): likewise
>> (-64): likewise
>> (-72): likewise
>> (-80): likewise
>> (-88): likewise
>> (-96): likewise
>> (-104): likewise
>
>Use slot0_offset...slot12_offset.
>
>> @@ -422,6 +430,16 @@ static const struct riscv_tune_info
>> riscv_tune_info_table[] = {
>> #include "riscv-cores.def"
>> };
>>
>> +typedef enum
>> +{
>> + PUSH_IDX = 0,
>> + POP_IDX,
>> + POPRET_IDX,
>> + ZCMP_OP_NUM
>> +} op_idx;
>
>op_idx -> riscv_zcmp_op_t
>> @@ -5388,6 +5487,42 @@ riscv_adjust_libcall_cfi_prologue ()
>> return dwarf;
>> }
>>
>> +static rtx
>> +riscv_adjust_multi_push_cfi_prologue (int saved_size)
>> +{
>> + rtx dwarf = NULL_RTX;
>> + rtx adjust_sp_rtx, reg, mem, insn;
>> + unsigned int mask = cfun->machine->frame.mask;
>> + int offset;
>> + int saved_cnt = 0;
>> +
>> + if (mask & S10_MASK)
>> + mask |= S11_MASK;
>> +
>> + for (int regno = GP_REG_LAST; regno >= GP_REG_FIRST; regno--)
>> + if (BITSET_P (mask & MULTI_PUSH_GPR_MASK, regno - GP_REG_FIRST))
>> + {
>> + /* The save order is s11-s0, ra
>> + from high to low addr. */
>> + offset = saved_size - UNITS_PER_WORD * (++saved_cnt);
>> +
>> + reg = gen_rtx_REG (SImode, regno);
>
>Should be Pmode rather than SImode, and seems
>riscv_adjust_libcall_cfi_prologue has same issue...could you send a
>separate patch to fix that?
>
>> + mem = gen_frame_mem (SImode, plus_constant (Pmode,
>
>Same here.
>
>> + stack_pointer_rtx,
>> + offset));
>> +
>> + insn = gen_rtx_SET (mem, reg);
>> + dwarf = alloc_reg_note (REG_CFA_OFFSET, insn, dwarf);
>> + }
>> +
>> + /* Debug info for adjust sp. */
>> + adjust_sp_rtx = gen_rtx_SET (stack_pointer_rtx,
>> + plus_constant(Pmode, stack_pointer_rtx,
>> -saved_size));
>> + dwarf = alloc_reg_note (REG_CFA_ADJUST_CFA, adjust_sp_rtx,
>> + dwarf);
>> + return dwarf;
>> +}
>> +
>> static void
>> riscv_emit_stack_tie (void)
>> {
>
>
>> @@ -5493,6 +5697,32 @@ riscv_expand_prologue (void)
>> }
>> }
>>
>> +static rtx
>> +riscv_adjust_multi_pop_cfi_epilogue (int saved_size)
>> +{
>> + rtx dwarf = NULL_RTX;
>> + rtx adjust_sp_rtx, reg;
>> + unsigned int mask = cfun->machine->frame.mask;
>> +
>> + if (mask & S10_MASK)
>> + mask |= S11_MASK;
>> +
>> + /* Debug info for adjust sp. */
>> + adjust_sp_rtx = gen_rtx_SET (stack_pointer_rtx,
>> + plus_constant(Pmode, stack_pointer_rtx,
>> saved_size));
>> + dwarf = alloc_reg_note (REG_CFA_ADJUST_CFA, adjust_sp_rtx,
>> + dwarf);
>> +
>> + for (int regno = GP_REG_FIRST; regno <= GP_REG_LAST; regno++)
>> + if (BITSET_P (mask, regno - GP_REG_FIRST))
>> + {
>> + reg = gen_rtx_REG (SImode, regno);
>
>Pmode
>
>> + dwarf = alloc_reg_note (REG_CFA_RESTORE, reg, dwarf);
>> + }
>> +
>> + return dwarf;
>> +}
>> +
>> static rtx
>> riscv_adjust_libcall_cfi_epilogue ()
>> {
>
>> diff --git a/gcc/config/riscv/zc.md b/gcc/config/riscv/zc.md
>> new file mode 100644
>> index 00000000000..f2f2198598c
>> --- /dev/null
>> +++ b/gcc/config/riscv/zc.md
>> @@ -0,0 +1,1042 @@
>> +;; Machine description for RISC-V Zc extention.
>> +;; Copyright (C) 2011-2023 Free Software Foundation, Inc.
>
>2023 rather than 2011-2023
