H8300: converting unsigned int to float

[Manfred Metzger <ManfredMetzger at gmx dot de>]

Hi!

I am using GCC 2.95 for the Hitachi H8/300 on a Linux system
with glibc-2.1.
Compiling the following program does not work:

unsigned int uc;
float f1;

int main ()
{
  f1 = uc;
  return 0;
}

It fails with

pc1:/root # h8300-hms-gcc -v -save-temps test.c
Reading specs from /usr/lib/gcc-lib/h8300-hms/2.95/specs
gcc version 2.95 19990728 (release)
(...)
 /usr/h8300-hms/bin/as -o test.o test.s
test.s: Assembler messages:
test.s:10: Error: cannot create floating-point number

The generated assembler-code looks like:

; GCC For the Hitachi H8/300
; By Hitachi America Ltd and Cygnus Support
; release F-1


 .file "test.c"
 .section .rodata
 .align 1
.LC0:
 .float 1.18305218616677471097e-269   <-- Here is the problem!
 .section .text
 .align 1
 .global _main
_main:
 push r6
 mov.w r7,r6
 push r4
 push r5
 mov.w @_uc,r1
 bld #7,r1h
 subx r0l,r0l
 subx r0h,r0h
 mov.w r1,r3
 mov.w r0,r2
 mov.w r2,r0
 mov.w r3,r1
 jsr @___floatsisf
 mov.w r1,r5
 mov.w r0,r4
 mov.w @_uc,r2
 mov.w r2,r2
 bge .L3
 mov.w @.LC0,r2
 mov.w @.LC0+2,r3
 mov.w r3,@-r7
 mov.w r2,@-r7
 mov.w r4,r0
 mov.w r5,r1
 jsr @___addsf3
 adds #2,r7
 adds #2,r7
 mov.w r1,r3
 mov.w r0,r2
 mov.w r3,r5
 mov.w r2,r4
.L3:
 mov.w r4,r2
 mov.w r5,r3
 mov.w r2,@_f1
 mov.w r3,@_f1+2
 sub.w r0,r0
 bra .L2
.L2:
 pop r5
 pop r4
 pop r6
 rts
 .comm _uc,2
 .comm _f1,4
 .end

I also tried to compile this program with egcs-2.91.60
and with this version it worked.
It generates the line

        .float 0.00000000000000000000e0

instead.

Regards,

Manni