diff options
Diffstat (limited to 'libgcc')
| -rw-r--r-- | libgcc/libgcc2.c | 2 | ||||
| -rw-r--r-- | libgcc/soft-fp/bitint.h | 26 |
2 files changed, 28 insertions, 0 deletions
diff --git a/libgcc/libgcc2.c b/libgcc/libgcc2.c index d217e33..8b42210 100644 --- a/libgcc/libgcc2.c +++ b/libgcc/libgcc2.c @@ -1640,6 +1640,8 @@ __mulbitint3 (UWtype *ret, SItype retprec, #endif #ifdef L_divmodbitint4 +/* D = -S. */ + static void bitint_negate (UWtype *d, const UWtype *s, SItype n) { diff --git a/libgcc/soft-fp/bitint.h b/libgcc/soft-fp/bitint.h index 5e8b764..20cd41b 100644 --- a/libgcc/soft-fp/bitint.h +++ b/libgcc/soft-fp/bitint.h @@ -160,6 +160,9 @@ bitint_reduce_prec (const UBILtype **p, SItype prec) # define BITINT_END(be, le) (le) #endif +/* Negate N limbs from S into D. D and S should point to + the least significant limb. */ + static inline __attribute__((__always_inline__)) void bitint_negate (UBILtype *d, const UBILtype *s, SItype n) { @@ -175,6 +178,19 @@ bitint_negate (UBILtype *d, const UBILtype *s, SItype n) while (--n); } +/* Common final part of __fix?fbitint conversion functions. + The A floating point value should have been converted using + soft-fp macros into RV, U##DI##type DI##_BITS precise normal + integral type and SHIFT, how many bits should that value be + shifted to the left. R is pointer to limbs array passed to the + function, RN number of limbs in it, ARPREC absolute value of + RPREC argument passed to it, RSIZE number of significant bits in RV. + RSIGNED is non-zero if the result is signed bit-precise integer, + otherwise zero. If OVF is true, instead of storing RV shifted left + by SHIFT bits and zero or sign extended store minimum or maximum + of the signed or unsigned bit-precise integer type or zero depending on if + RV contains the minimum or maximum signed or unsigned value or zero. */ + #define FP_TO_BITINT(r, rn, arprec, shift, rv, rsize, rsigned, ovf, DI) \ if (ovf) \ { \ @@ -232,6 +248,16 @@ bitint_negate (UBILtype *d, const UBILtype *s, SItype n) * sizeof (UBILtype)); \ } +/* Common initial part of __floatbitint?f conversion functions. + I and IPREC are arguments passed to those functions, convert that + into a pair of DI##type IV integer and SHIFT, such that converting + IV to floating point and multiplicating that by pow (2, SHIFT) + gives the expected result. IV size needs to be chosen such that + it is larger than number of bits in floating-point mantissa and + contains there even at least a two bits below the mantissa for + rounding purposes. If any of the SHIFT bits shifted out is non-zero, + the least significant bit should be non-zero. */ + #define FP_FROM_BITINT(i, iprec, iv, shift, DI) \ do \ { \ |