From e024e881bb1a8b5085026589360d26ed97acdd64 Mon Sep 17 00:00:00 2001 From: Aurelien Jarno Date: Thu, 6 Jan 2011 15:38:19 +0100 Subject: [PATCH] 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 Signed-off-by: Aurelien Jarno --- fpu/softfloat-specialize.h | 19 +++++++++++++++++-- 1 file changed, 17 insertions(+), 2 deletions(-) diff --git a/fpu/softfloat-specialize.h b/fpu/softfloat-specialize.h index acdd299f51..f293f24356 100644 --- a/fpu/softfloat-specialize.h +++ b/fpu/softfloat-specialize.h @@ -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 )) -- 2.34.1