[Bug target/11787] New: always call memcpy for block move in mips16

["stephane dot mutz at philips dot com" <gcc-bugzilla at gcc dot gnu dot org>]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11787

           Summary: always call memcpy for block move in mips16
           Product: gcc
           Version: 3.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: target
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: stephane dot mutz at philips dot com
                CC: gcc-bugs at gcc dot gnu dot org
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: mips-uclibc-gnu

The compiler always generates a call to memcpy() for internally or manually 
generated block moves even for very small blocks (few bytes) when compiling for 
mips16.

1)How to reproduce:
source code: essai.c
int main ()
{  memcpy ( 0x8fc01000, 0x8fc02000, 2);
  
  memcpy ( 0x8fc01000, 0x8fc02000, 20);
  
  memcpy ( 0x8fc01000, 0x8fc02000, 200);
  
  memcpy ( 0x8fc01000, 0x8fc02000, 2000);
}

gcc -O2 -mips16 -S essai.c

result asm: essai.s
        .file   1 "essai.c"
        .section .mdebug.abi32
        .previous
        .abicalls
        .set    mips16
        .text
        .align  2
        .globl  main
        .ent    main
        .type   main, @function
main:
        .frame  $sp,40,$31              # vars= 0, regs= 4/0, args= 16, extra= 8
        .mask   0x90030000,-4
        .fmask  0x00000000,0
        .set    noreorder
        .cpload $25
        .set    reorder
        subu    $sp,$sp,40
        .cprestore 16
        sw      $17,28($sp)
        sw      $16,24($sp)
        lw      $17,$LC1
        lw      $16,$LC0
        move    $2,$28
        move    $4,$16
        move    $5,$17
        li      $6,2
        sw      $31,36($sp)
        sw      $2,32($sp)
        la      $25,memcpy
        jal     $3,$25
        move    $4,$16
        move    $5,$17
        li      $6,20
        la      $25,memcpy
        jal     $3,$25
        move    $4,$16
        move    $5,$17
        li      $6,200
        la      $25,memcpy
        jal     $3,$25
        move    $4,$16
        move    $5,$17
        li      $6,2000
        la      $25,memcpy
        jal     $3,$25
        lw      $7,36($sp)
        lw      $17,28($sp)
        lw      $16,24($sp)
        #nop
        move    $3,$sp
        addu    $3,40
        move    $sp,$3
        j       $7
        .end    main
        .align  2
$LC0:
        .word   -1883238400
        .align  2
$LC1:
        .word   -1883234304
        .ident  "GCC: (GNU) 3.3"

2)Build platform
lxws005:/user/mutz/build/profiler> mips-uclibc-gcc --verbose -S essai.c
Reading specs from /user/mutz/mips/lib/gcc-lib/mips-linux/3.3/specs
Configured with: /user/mutz/build/build_mips/gcc-3.3/configure --target=mips-
linux --prefix=/user/mutz/mips --exec-prefix=/user/mutz/mips --
bindir=/user/mutz/mips/bin --sbindir=/user/mutz/mips/sbin --
sysconfdir=/user/mutz/mips/etc --datadir=/user/mutz/mips/share --
localstatedir=/user/mutz/mips/var --mandir=/user/mutz/mips/man --
infodir=/user/mutz/mips/info --with-local-prefix=/user/mutz/mips/usr/local --
libdir=/user/mutz/mips/lib --includedir=/user/mutz/mips/include --with-gxx-
include-dir=/user/mutz/mips/include/c++ --
oldincludedir=/user/mutz/mips/include --enable-shared --enable-target-optspace -
-disable-nls --with-gnu-ld --disable-__cxa_atexit --enable-languages=c,c++ --
program-prefix=mips-uclibc-
Thread model: posix
gcc version 3.3
 /user/mutz/mips/lib/gcc-lib/mips-linux/3.3/cc1 -quiet -v -D__GNUC__=3 -
D__GNUC_MINOR__=3 -D__GNUC_PATCHLEVEL__=0 essai.c -quiet -dumpbase essai.c -
auxbase essai -version -o essai.s
GNU C version 3.3 (mips-linux)
	compiled by GNU C version 3.3.
GGC heuristics: --param ggc-min-expand=64 --param ggc-min-heapsize=64237
ignoring duplicate directory "/user/mutz/mips/mips-linux/sys-include"
ignoring duplicate directory "/user/mutz/mips/mips-linux/include"
#include "..." search starts here:
#include <...> search starts here:
 /user/mutz/mips/include
 /user/mutz/mips/lib/gcc-lib/mips-linux/3.3/include
End of search list.
essai.c: In function `main':
essai.c:3: warning: passing arg 1 of `memcpy' makes pointer from integer 
without a cast
essai.c:3: warning: passing arg 2 of `memcpy' makes pointer from integer 
without a cast
essai.c:5: warning: passing arg 1 of `memcpy' makes pointer from integer 
without a cast
essai.c:5: warning: passing arg 2 of `memcpy' makes pointer from integer 
without a cast
essai.c:7: warning: passing arg 1 of `memcpy' makes pointer from integer 
without a cast
essai.c:7: warning: passing arg 2 of `memcpy' makes pointer from integer 
without a cast
essai.c:9: warning: passing arg 1 of `memcpy' makes pointer from integer 
without a cast
essai.c:9: warning: passing arg 2 of `memcpy' makes pointer from integer 
without a cast
lxws005:/user/mutz/build/profiler> uname -a
Linux lxws005 2.4.18-5Caen #4 Wed Aug 14 17:05:20 CEST 2002 i686 unknown

3)Other info
Also reproduce on GCC 3.2.2 mips cross-compiler on HP and linux platform