diff options
Diffstat (limited to 'sim/ppc/bits.h')
| -rw-r--r-- | sim/ppc/bits.h | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/sim/ppc/bits.h b/sim/ppc/bits.h index 06898e0..35e4322 100644 --- a/sim/ppc/bits.h +++ b/sim/ppc/bits.h @@ -45,10 +45,15 @@ MASKED*(VALUE, FIRST, LAST): Masks out all but bits [FIRST .. LAST]. + LSMASKED*(VALUE, FIRST, LAST): Like MASKED - LS bit is zero. + EXTRACTED*(VALUE, FIRST, LAST): Masks out bits [FIRST .. LAST] but also right shifts the masked value so that bit LAST becomes the least significant (right most). + LSEXTRACTED*(VALUE, FIRST, LAST): Same as extracted - LS bit is + zero. + SHUFFLED**(VALUE, OLD, NEW): Mask then move a single bit from OLD new NEW. @@ -77,6 +82,13 @@ #define _MAKE_SHIFT(WIDTH, pos) ((WIDTH) - 1 - (pos)) +#if (WITH_TARGET_WORD_MSB == 0) +#define _LSB_POS(WIDTH, SHIFT) (WIDTH - 1 - SHIFT) +#else +#define _LSB_POS(WIDTH, SHIFT) (SHIFT) +#endif + + /* MakeBit */ #define _BITn(WIDTH, pos) (((natural##WIDTH)(1)) \ << _MAKE_SHIFT(WIDTH, pos)) @@ -104,6 +116,14 @@ #define MASK32(START, STOP) _MASKn(32, START, STOP) #define MASK64(START, STOP) _MASKn(64, START, STOP) +/* Multi-bit mask on least significant bits */ + +#define _LSMASKn(WIDTH, FIRST, LAST) _MASKn (WIDTH, \ + _LSB_POS (WIDTH, FIRST), \ + _LSB_POS (WIDTH, LAST)) + +#define LSMASK64(FIRST, LAST) _LSMASKn (64, (FIRST), (LAST)) + #if (WITH_TARGET_WORD_BITSIZE == 64) #define MASK(START, STOP) \ (((START) <= (STOP)) \ @@ -149,6 +169,12 @@ INLINE_BITS\ unsigned start, unsigned stop); +INLINE_BITS\ +(unsigned64) LSMASKED64 +(unsigned64 word, + int first, + int last); + /* extract the required bits aligning them with the lsb */ #define _EXTRACTEDn(WIDTH, WORD, START, STOP) \ @@ -165,6 +191,11 @@ INLINE_BITS\ unsigned start, unsigned stop); +INLINE_BITS\ +(unsigned64) LSEXTRACTED64 +(unsigned64 val, + int start, + int stop); /* move a single bit around */ /* NB: the wierdness (N>O?N-O:0) is to stop a warning from GCC */ |