diff options
Diffstat (limited to 'gcc/libgcc2.c')
| -rw-r--r-- | gcc/libgcc2.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/gcc/libgcc2.c b/gcc/libgcc2.c index 03cc448cab3..97717a428c9 100644 --- a/gcc/libgcc2.c +++ b/gcc/libgcc2.c @@ -1371,7 +1371,14 @@ __floatunditf (UDWtype u) #if (defined(L_floatdisf) && LIBGCC2_HAS_SF_MODE) \ || (defined(L_floatdidf) && LIBGCC2_HAS_DF_MODE) #define DI_SIZE (W_TYPE_SIZE * 2) -#define F_MODE_OK(SIZE) (SIZE < DI_SIZE && SIZE > (DI_SIZE - SIZE + FSSIZE)) +#define F_MODE_OK(SIZE) \ + (SIZE < DI_SIZE \ + && SIZE > (DI_SIZE - SIZE + FSSIZE) \ + /* Don't use IBM Extended Double TFmode for TI->SF calculations. \ + The conversion from long double to float suffers from double \ + rounding, because we convert via double. In any case, the \ + fallback code is faster. */ \ + && !IS_IBM_EXTENDED (SIZE)) #if defined(L_floatdisf) #define FUNC __floatdisf #define FSTYPE SFtype @@ -1476,7 +1483,14 @@ FUNC (DWtype u) #if (defined(L_floatundisf) && LIBGCC2_HAS_SF_MODE) \ || (defined(L_floatundidf) && LIBGCC2_HAS_DF_MODE) #define DI_SIZE (W_TYPE_SIZE * 2) -#define F_MODE_OK(SIZE) (SIZE < DI_SIZE && SIZE > (DI_SIZE - SIZE + FSSIZE)) +#define F_MODE_OK(SIZE) \ + (SIZE < DI_SIZE \ + && SIZE > (DI_SIZE - SIZE + FSSIZE) \ + /* Don't use IBM Extended Double TFmode for TI->SF calculations. \ + The conversion from long double to float suffers from double \ + rounding, because we convert via double. In any case, the \ + fallback code is faster. */ \ + && !IS_IBM_EXTENDED (SIZE)) #if defined(L_floatundisf) #define FUNC __floatundisf #define FSTYPE SFtype |