problem while building arm vfp softfloat gcc 

[add]

if using your test case, here is my foo.s
main:
        @ args = 0, pretend = 0, frame = 4
        @ frame_needed = 1, uses_anonymous_args = 0
        mov     ip, sp
        stmfd   sp!, {fp, ip, lr, pc}
        sub     fp, ip, #4
        sub     sp, sp, #4
        ldr     r3, .L2 @ float
        str     r3, [fp, #-16]  @ float
        ldr     r0, [fp, #-16]  @ float
        bl      foo
        mov     r3, #0
        mov     r0, r3
        ldmea   fp, {fp, sp, pc}

seems no problem?

>> add <addsub@eyou.com> wrote:
>> > I'm building a arm-linux-gcc toolchain with soft-vfp support by
>> > crosstool-0.27(Thanks to Dan). But generated code cannot execute
>> > "printf("%f",1.00)" well, it will output 0.00000.
>> > 
>> > Then I found gcc doesn't produce right code, it uses wrong registers
sequence
>> > to pass float argument to function()
>> 
>> Richard Earnshaw wrote:
>> > To the best of my knowledge the only configuration of a released version

>> > of gcc that supports soft-vfp is arm-netbsdelf.
>> 
>> He's using a patch that adds that, I think.
>
>Ah!  OK, lets take a closer look at the test case.... Hmm, it's broken:
>
>It passes a float to a function that's declared without a prototype, and 
>it returns a value from a void function...
>
>Let's fix up the problems...
>
>
>$ cat foo.c
>float foo(float);
>int main()
>{
>        float i=1.0;
>        foo(i);
>        return 0;
>}
>float foo( float i )
>{
>        return i;
>}
>$ cat foo.s
>main:
>        @ args = 0, pretend = 0, frame = 4
>        @ frame_needed = 0, uses_anonymous_args = 0
>        str     lr, [sp, #-4]!
>        sub     sp, sp, #4
>        ldr     r3, .L2 @ float
>        str     r3, [sp, #0]    @ float
>        ldr     r0, [sp, #0]    @ float
>        bl      foo
>        mov     r3, #0
>        mov     r0, r3
>        add     sp, sp, #4
>        ldmfd   sp!, {pc}
>
>
>Yep, that looks right to me.
>
>R.
>
>
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