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From: "jzhgonha at 163 dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/110188] gcc for RISC-V stack aligned error
Date: Mon, 12 Jun 2023 00:15:42 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110188

--- Comment #6 from jzhgonha at 163 dot com ---
   thank you very much!

   =E5=8F=91=E8=87=AA=E6=88=91=E7=9A=84=E5=B0=8F=E7=B1=B3=E5=9C=A8 "kito at=
 gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>=EF=BC=8C2023=E5=B9=B46=E6=9C=
=889=E6=97=A5
   =E4=B8=8B=E5=8D=889:51=E5=86=99=E9=81=93=EF=BC=9A

     https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110188

     Kito Cheng <kito at gcc dot gnu.org[1]> changed:

     What |Removed |Added
=20=20=20=20
----------------------------------------------------------------------------
     CC| |kito at gcc dot gnu.org[1]

     --- Comment #5 from Kito Cheng <kito at gcc dot gnu.org[1]> ---
     Each stack area will align to 16 byte, that could be optimized in
     theory, but
     will complicate the frame layout implementation.

     ----sp - 0
     a9 / outgoing stack arguments area
     ----sp - 4
     <unused> / outgoing stack arguments area
     ----sp - 8
     <unused> / outgoing stack arguments area
     ----sp - 12
     <unused> / outgoing stack arguments area
     ----sp - 16
     <unused> / GPR save area
     ----sp - 20
     <unused> / GPR save area
     ----sp - 24
     <unused> / GPR save area
     ----sp - 28
     ra / GPR save area
     ----sp - 32



     Complete layout has document in riscv.cc[2]:

     +-------------------------------+
     | |
     | incoming stack arguments |
     | |
     +-------------------------------+ <-- incoming stack pointer
     | |
     | callee-allocated save area |
     | for arguments that are |
     | split between registers and |
     | the stack |
     | |
     +-------------------------------+ <-- arg_pointer_rtx
     | |
     | callee-allocated save area |
     | for register varargs |
     | |
     +-------------------------------+ <-- hard_frame_pointer_rtx;
     | | stack_pointer_rtx + gp_sp_offset
     | GPR save area | + UNITS_PER_WORD
     | |
     +-------------------------------+ <-- stack_pointer_rtx +
     fp_sp_offset
     | | + UNITS_PER_HWVALUE
     | FPR save area |
     | |
     +-------------------------------+ <-- frame_pointer_rtx (virtual)
     | |
     | local variables |
     | |
     P +-------------------------------+
     | |
     | outgoing stack arguments |
     | |
     +-------------------------------+ <-- stack_pointer_rtx

     --
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     You reported the bug.



   1. http://gnu.org
   2. http://riscv.cc=