Implementation Defined Behavior
A.11 HINTS
ISO Standard:
Implementation:
ISO Standard:
Implementation:
ISO Standard:
Implementation:
“The size of the result of subtracting two pointers to elements of
the same array (C90 6.3.6, C99 6.5.6).”
32 bit signed integer.
“The extent to which suggestions made by using the register
storage-class specifier are effective (C90 6.5.1, C99 6.7.1).”
The register storage class specifier generally has no effect.
“The extent to which suggestions made by using the inline function
specifier are effective (C99 6.7.4).”
If -fno-inline or -O0 are specified, no functions will be inlined,
even if specified with the inline specifier. Otherwise, the
function may or may not be inlined dependent on the optimization
heuristics of the compiler.
A.12 STRUCTURES, UNIONS, ENUMERATIONS, AND BIT-FIELDS
ISO Standard:
Implementation:
ISO Standard:
Implementation:
ISO Standard:
Implementation:
ISO Standard:
Implementation:
ISO Standard:
Implementation:
ISO Standard:
? 2007 Microchip Technology Inc.
“A member of a union object is accessed using a member of a
different type (C90 6.3.2.3).”
The corresponding bytes of the union object are interpreted as an
object of the type of the member being accessed without regard
for alignment or other possible invalid conditions.
“Whether a “plain” int bit-field is treated as a signed int bit-field or
as an unsigned int bit-field (C90 6.5.2, C90 6.5.2.1, C99 6.7.2, C99
6.7.2.1).”
By default, a plain int bit-field is treated as a signed integer. This
behavior can be altered by use of the -funsigned-bitfields
command line option.
“Allowable bit-field types other than _Bool, signed int, and
unsigned int (C99 6.7.2.1).”
No other types are supported.
“Whether a bit-field can straddle a storage-unit boundary (C90
6.5.2.1, C99 6.7.2.1).”
No.
“The order of allocation of bit-fields within a unit (C90 6.5.2.1, C99
6.7.2.1).”
Bit-fields are allocated left to right.
“The alignment of non-bit-field members of structures (C90
6.5.2.1, C99 6.7.2.1).”
DS51686A-page 93
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