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Aliasing through a union member is valid.

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Take back my previous TODO.
This commit is contained in:
David Neto 2015-11-23 15:15:41 -05:00
parent 15afbf9372
commit c9e0845c7f
2 changed files with 3 additions and 3 deletions
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4
source/endian.cpp
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@ -33,7 +33,9 @@ enum {
I32_ENDIAN_BIG = 0x00010203ul, I32_ENDIAN_BIG = 0x00010203ul,
}; };
// TODO(dneto): This relies on undefined behaviour. Fix that. // This constant value allows the detection of the host machine's endianness.
// Accessing it through the "value" member is valid due to C++11 section 3.10
// paragraph 10.
static const union { static const union {
unsigned char bytes[4]; unsigned char bytes[4];
uint32_t value; uint32_t value;

2
test/UnitSPIRV.h
View File

@ -61,8 +61,6 @@ enum {
I32_ENDIAN_BIG = 0x00010203ul, I32_ENDIAN_BIG = 0x00010203ul,
}; };
// TODO(dneto): Using a union this way relies on undefined behaviour.
// Replace this with uses of BitwiseCast from util/bitutils.h
static const union { static const union {
unsigned char bytes[4]; unsigned char bytes[4];
uint32_t value; uint32_t value;