Strange(?) g++ behavior with references (egcs1.0.1).

[Sergei Organov]

Hello;

g++ for PowerPC target produces correct but very strange(?) results for
the code below. Could somebody comment on that, please.

int volatile & 
r1 = *(int volatile *)10; // g++ puts 'r1' to '.sdata'.
                          // why not into '.sdata2' ?
int volatile & 
r2 = *(int *)20;  // generates run-time(!) initialization for 'r2'.

int volatile *const p1 =  (int volatile *)10; // Ok, '.sdata2'
int volatile *const p2 =  (int          *)20; // Ok, '.sdata2'

Here is result of compilation:

        .file   "volref.cc"

 # rs6000/powerpc options: --with-cpu=505 -msdata=eabi -G 8
 # GNU C++ version egcs-2.90.23 980102 (egcs-1.0.1 release) (ppc-rtems)
compiled
 # options passed:  -mcall-sysv -meabi -msdata=eabi
 # options enabled:  -fpeephole -ffunction-cse -fkeep-static-consts
 # -fpcc-struct-return -fexceptions -fsjlj-exceptions -fcommon
 # -fverbose-asm -fgnu-linker -fargument-alias -mpowerpc -mnew-mnemonics
 # -meabi -mcall-sysv -msdata=eabi

gcc2_compiled.:
        .globl r1
        .section ".sdata","aw"
        .align 2
        .type    r1,@object
        .size    r1,4
r1:
        .long 10
        .globl r2
        .align 2
r2:
        .space  4
        .size    r2,4
        .section ".text"
        .align 2
        .globl _GLOBAL_.I.r1
        .type    _GLOBAL_.I.r1,@function
_GLOBAL_.I.r1:
        stwu 1,-16(1)
        stw 31,12(1)
        mr 31,1
        li 0,20
        stw 0,r2@sda21(0)
        b .L2
        b .L1
.L2:
.L1:
        lwz 11,0(1)
        lwz 31,-4(11)
        mr 1,11
        blr
.Lfe1:
        .size    _GLOBAL_.I.r1,.Lfe1-_GLOBAL_.I.r1
.section        .ctors,"aw"
        .long    _GLOBAL_.I.r1
        .section ".sdata2","a"
        .align 2
        .type    p1,@object
        .size    p1,4
p1:
        .long 10
        .align 2
        .type    p2,@object
        .size    p2,4
p2:
        .long 20
        .ident  "GCC: (GNU) egcs-2.90.23 980102 (egcs-1.0.1 release)"