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target-ppc: Implement correct NaN propagation rules 

Implement the correct NaN propagation rules for PowerPC targets by
providing an appropriate pickNaN function.

Also fix the #ifdef tests for default NaN definition, the correct name
is TARGET_PPC instead of TARGET_POWERPC.

Reviewed-by: Nathan Froyd <froydnj@codesourcery.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
master
Aurelien Jarno 2011-01-06 15:38:19 +01:00
parent 084d19ba71
commit e024e881bb
1 changed files with 17 additions and 2 deletions
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19
fpu/softfloat-specialize.h
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@ -61,7 +61,7 @@ typedef struct {
*----------------------------------------------------------------------------*/
#if defined(TARGET_SPARC)
#define float32_default_nan make_float32(0x7FFFFFFF)
#elif defined(TARGET_POWERPC) || defined(TARGET_ARM) || defined(TARGET_ALPHA)
#elif defined(TARGET_PPC) || defined(TARGET_ARM) || defined(TARGET_ALPHA)
#define float32_default_nan make_float32(0x7FC00000)
#elif SNAN_BIT_IS_ONE
#define float32_default_nan make_float32(0x7FBFFFFF)
@ -219,6 +219,21 @@ static int pickNaN(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN,
return 1;
}
}
#elif defined(TARGET_PPC)
static int pickNaN(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN,
flag aIsLargerSignificand)
{
/* PowerPC propagation rules:
* 1. A if it sNaN or qNaN
* 2. B if it sNaN or qNaN
* A signaling NaN is always silenced before returning it.
*/
if (aIsSNaN || aIsQNaN) {
return 0;
} else {
return 1;
}
}
#else
static int pickNaN(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN,
flag aIsLargerSignificand)
@ -296,7 +311,7 @@ static float32 propagateFloat32NaN( float32 a, float32 b STATUS_PARAM)
*----------------------------------------------------------------------------*/
#if defined(TARGET_SPARC)
#define float64_default_nan make_float64(LIT64( 0x7FFFFFFFFFFFFFFF ))
#elif defined(TARGET_POWERPC) || defined(TARGET_ARM) || defined(TARGET_ALPHA)
#elif defined(TARGET_PPC) || defined(TARGET_ARM) || defined(TARGET_ALPHA)
#define float64_default_nan make_float64(LIT64( 0x7FF8000000000000 ))
#elif SNAN_BIT_IS_ONE
#define float64_default_nan make_float64(LIT64( 0x7FF7FFFFFFFFFFFF ))