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RE: [avr-gcc-list] AVR-GCC question
From: |
Dave Hansen |
Subject: |
RE: [avr-gcc-list] AVR-GCC question |
Date: |
Mon, 23 May 2005 16:47:08 -0400 |
From: "Trampas" <address@hidden>
I don't think that is portable. That is I know some 16 bit processors and
It's not, but not for the reason you specify.
compilers will report an INT16 as being sizeof 1. That is sizeof for word
If sizeof(int16_t) == 1, then CHAR_BIT == 16.
addressable machines may report a char as 1 and a 16 bit variable as 1.
Thus
sizeof is not always number of bytes, like it is for the X86. Rather
sizeof
is the number of smallest storage locations required for the variable.
sizeof _always_ reports the number of bytes. A byte does _not_ necessarily
mean 8 bits (although it is always _at_least_ 8 bits).
[...]
-----Original Message-----
From: Jeff Epler [mailto:address@hidden
[...]
#include <limits.h>
#define MAX_SIGNED(x) (double)((1ull<<(CHAR_BIT * sizeof(x) - 1))-1)
Using this macro, though, the signed char -128 goes to a value below
-1.0. I think that's the same thing your code did.
?
If x is a signed char, then sizeof(x) == 1. Always. Regardless of the
value of x.
Regards,
-=Dave
- Re: [avr-gcc-list] AVR-GCC question, (continued)
- Re: [avr-gcc-list] AVR-GCC question, Joerg Wunsch, 2005/05/23
- Re: [avr-gcc-list] AVR-GCC question, Daniel O'Connor, 2005/05/23
- Re: [avr-gcc-list] AVR-GCC question, E. Weddington, 2005/05/23
- Re: [avr-gcc-list] AVR-GCC question, Joerg Wunsch, 2005/05/23
- RE: [avr-gcc-list] AVR-GCC question, Trampas, 2005/05/23
- Re: [avr-gcc-list] AVR-GCC question, E. Weddington, 2005/05/23
- Re: [avr-gcc-list] AVR-GCC question, Matthew MacClary, 2005/05/23
- Re: [avr-gcc-list] AVR-GCC question, Joerg Wunsch, 2005/05/24
- Re: [avr-gcc-list] AVR-GCC question, Jeff Epler, 2005/05/23
- RE: [avr-gcc-list] AVR-GCC question, Trampas, 2005/05/23
- RE: [avr-gcc-list] AVR-GCC question,
Dave Hansen <=
- Re: [avr-gcc-list] AVR-GCC question, Jeff Epler, 2005/05/23
- Re: [avr-gcc-list] AVR-GCC question, Russell Shaw, 2005/05/23
- Re: [avr-gcc-list] AVR-GCC question, Daniel O'Connor, 2005/05/23
RE: [avr-gcc-list] AVR-GCC question, Matt.VanDeWerken, 2005/05/22
[avr-gcc-list] AVR-GCC question, Haase Bjoern (PT-BEU/EMT) *, 2005/05/23
Re: [avr-gcc-list] AVR-GCC question, Klaus Rudolph, 2005/05/23