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Re: [avr-gcc-list] Avr-gcc Produces Incorrect Code with -Os
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From: |
Thomas D. Dean |
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Subject: |
Re: [avr-gcc-list] Avr-gcc Produces Incorrect Code with -Os |
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Date: |
Thu, 15 May 2008 09:38:22 -0700 (PDT) |
>From 'info gcc',
...
You can prevent an `asm' instruction from being deleted, moved
significantly, or combined, by writing the keyword `volatile' after the
`asm'.
Changing the code fragment to
...
dtostrf(cos_rad,6,3,&line4[14]);
line3[20] = ' ';
line4[20] = ' ';
asm volatile("sbi 0x1b,4" : :);
atan_rad = atan2(cos_rad,sin_rad);
asm volatile("cbi 0x1b,4" : :);
dtostrf(atan_rad,6,3,&line4[26]);
...
does not alter the result.
The .elf code is incorrect!
- Re: [avr-gcc-list] Avr-gcc Produces Incorrect Code with -Os, (continued)
- Re: [avr-gcc-list] Avr-gcc Produces Incorrect Code with -Os, Thomas D. Dean, 2008/05/16
- RE: [avr-gcc-list] Avr-gcc Produces Incorrect Code with -Os, Stu Bell, 2008/05/16
- RE: [avr-gcc-list] Avr-gcc Produces Incorrect Code with -Os, John Regehr, 2008/05/16
- RE: [avr-gcc-list] Avr-gcc Produces Incorrect Code with -Os, Stu Bell, 2008/05/16
- Re: [avr-gcc-list] Avr-gcc Produces Incorrect Code with -Os, Thomas D. Dean, 2008/05/16
- Re: [avr-gcc-list] Avr-gcc Produces Incorrect Code with -Os, David Brown, 2008/05/17
Re: [avr-gcc-list] Avr-gcc Produces Incorrect Code with -Os, Thomas D. Dean, 2008/05/15
Re: [avr-gcc-list] Avr-gcc Produces Incorrect Code with -Os,
Thomas D. Dean <=
Re: [avr-gcc-list] Avr-gcc Produces Incorrect Code with -Os, hutchinsonandy, 2008/05/15
Re: [avr-gcc-list] Avr-gcc Produces Incorrect Code with -Os, Alex Wenger, 2008/05/15
Re: [avr-gcc-list] Avr-gcc Produces Incorrect Code with -Os, David Brown, 2008/05/15
FW: [avr-gcc-list] Avr-gcc Produces Incorrect Code with -Os, Ron Kreymborg, 2008/05/23