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Add SDL_FLOATWORDORDER for older ARM toolchains

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This commit is contained in:
Cameron Cawley
2022-05-03 23:21:10 +01:00
committed by Sam Lantinga
parent adac3bd1e2
commit b398a847be
4 changed files with 66 additions and 1 deletions
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23
test/testplatform.c
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@@ -86,18 +86,25 @@ TestEndian(SDL_bool verbose)
int error = 0;
Uint16 value = 0x1234;
int real_byteorder;
int real_floatwordorder = 0;
Uint16 value16 = 0xCDAB;
Uint16 swapped16 = 0xABCD;
Uint32 value32 = 0xEFBEADDE;
Uint32 swapped32 = 0xDEADBEEF;
Uint64 value64, swapped64;
union {
double d;
Uint32 ui32[2];
} value_double;
value64 = 0xEFBEADDE;
value64 <<= 32;
value64 |= 0xCDAB3412;
swapped64 = 0x1234ABCD;
swapped64 <<= 32;
swapped64 |= 0xDEADBEEF;
value_double.d = 3.141593;
if (verbose) {
SDL_Log("Detected a %s endian machine.\n",
@@ -115,6 +122,22 @@ TestEndian(SDL_bool verbose)
}
++error;
}
if (verbose) {
SDL_Log("Detected a %s endian float word order machine.\n",
(SDL_FLOATWORDORDER == SDL_LIL_ENDIAN) ? "little" : "big");
}
if (value_double.ui32[0] == 0x82c2bd7f && value_double.ui32[1] == 0x400921fb) {
real_floatwordorder = SDL_LIL_ENDIAN;
} else if (value_double.ui32[0] == 0x400921fb && value_double.ui32[1] == 0x82c2bd7f) {
real_floatwordorder = SDL_BIG_ENDIAN;
}
if (real_floatwordorder != SDL_FLOATWORDORDER) {
if (verbose) {
SDL_Log("Actually a %s endian float word order machine!\n",
(real_floatwordorder == SDL_LIL_ENDIAN) ? "little" : (real_floatwordorder == SDL_BIG_ENDIAN) ? "big" : "unknown" );
}
++error;
}
if (verbose) {
SDL_Log("Value 16 = 0x%X, swapped = 0x%X\n", value16,
SDL_Swap16(value16));