actually, >,<,>=,<= should return either -1 or 1.
am I ...?? may be :)
fixed.
~d
On Tuesday 05 August 2003 02:06, Takahashi, Chris wrote:
> The patch msp430-libc/src/libm fixsfsi.c,1.4,1.5 mulsf.c,1.6,1.7 seems to
> work but there appear to be more problems with libfp.
>
> While testing this update I noticed that there were still problems when I
> linked in libfp. I narrowed the problem down to >=, <=, <, and >
> evaluation with floating point numbers. After examining __gesf2 and the
> asm generated to call __gesf2 I noticed that the code to return from
> __gesf2 seems faulty:
>
> a[1] = (small >= big); //0
> 8092: 0b 43 clr r11 ;
> 8094: 1e 41 04 00 mov 4(r1), r14 ;
> 8098: 1f 41 06 00 mov 6(r1), r15 ;
> 809c: 2c 41 mov @r1, r12 ;
> 809e: 1d 41 02 00 mov 2(r1), r13 ;
> 80a2: b0 12 b4 81 call #-32332 ;#0x81b4
> 80a6: 0f 93 cmp #0, r15 ;r3 As==00
> 80a8: 01 38 jl $+4 ;abs 0x80ac
> 80aa: 1b 43 mov #1, r11 ;r3 As==01
> 80ac: 81 4b 12 00 mov r11, 18(r1) ;
> where addr 0x81b4 is __gesf2.
>
> Because __gesf2 always returns a 0 or a 1 cmp will never set the negative
> flag and because cmp here does r15 - 0 the V flag will never be set either.
>
> Oddly enough the tests for >= and <= I wrote work with the simulator.
>
> I believe that the other operations may have similar problems.
>
> Attached are my simulator (tests.c) source and my regular test (test.c)
> source.
>
> -Chris
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