diff options
| author | Nikunj A Dadhania <nikunj@linux.vnet.ibm.com> | 2016-10-30 08:44:55 +0530 |
|---|---|---|
| committer | David Gibson <david@gibson.dropbear.id.au> | 2016-11-15 10:05:50 +1100 |
| commit | ecce0369b864e3c505b89942cd8cc23a62a4386f (patch) | |
| tree | 6411d565cfb6ee0644412b94513e1b923c514dda /include | |
| parent | 682df581c65ed2c1b9e77093e332214ecaa1ee93 (diff) | |
bitops: fix rol/ror when shift is zero
All the variants for rol/ror have a bug in case where the shift == 0.
For example rol32, would generate:
return (word << 0) | (word >> 32);
Which though works, would be flagged as a runtime error on clang's
sanitizer.
Suggested-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Diffstat (limited to 'include')
| -rw-r--r-- | include/qemu/bitops.h | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/include/qemu/bitops.h b/include/qemu/bitops.h index 98fb005aba..1881284cb5 100644 --- a/include/qemu/bitops.h +++ b/include/qemu/bitops.h @@ -218,7 +218,7 @@ static inline unsigned long hweight_long(unsigned long w) */ static inline uint8_t rol8(uint8_t word, unsigned int shift) { - return (word << shift) | (word >> (8 - shift)); + return (word << shift) | (word >> ((8 - shift) & 7)); } /** @@ -228,7 +228,7 @@ static inline uint8_t rol8(uint8_t word, unsigned int shift) */ static inline uint8_t ror8(uint8_t word, unsigned int shift) { - return (word >> shift) | (word << (8 - shift)); + return (word >> shift) | (word << ((8 - shift) & 7)); } /** @@ -238,7 +238,7 @@ static inline uint8_t ror8(uint8_t word, unsigned int shift) */ static inline uint16_t rol16(uint16_t word, unsigned int shift) { - return (word << shift) | (word >> (16 - shift)); + return (word << shift) | (word >> ((16 - shift) & 15)); } /** @@ -248,7 +248,7 @@ static inline uint16_t rol16(uint16_t word, unsigned int shift) */ static inline uint16_t ror16(uint16_t word, unsigned int shift) { - return (word >> shift) | (word << (16 - shift)); + return (word >> shift) | (word << ((16 - shift) & 15)); } /** @@ -258,7 +258,7 @@ static inline uint16_t ror16(uint16_t word, unsigned int shift) */ static inline uint32_t rol32(uint32_t word, unsigned int shift) { - return (word << shift) | (word >> (32 - shift)); + return (word << shift) | (word >> ((32 - shift) & 31)); } /** @@ -268,7 +268,7 @@ static inline uint32_t rol32(uint32_t word, unsigned int shift) */ static inline uint32_t ror32(uint32_t word, unsigned int shift) { - return (word >> shift) | (word << (32 - shift)); + return (word >> shift) | (word << ((32 - shift) & 31)); } /** @@ -278,7 +278,7 @@ static inline uint32_t ror32(uint32_t word, unsigned int shift) */ static inline uint64_t rol64(uint64_t word, unsigned int shift) { - return (word << shift) | (word >> (64 - shift)); + return (word << shift) | (word >> ((64 - shift) & 63)); } /** @@ -288,7 +288,7 @@ static inline uint64_t rol64(uint64_t word, unsigned int shift) */ static inline uint64_t ror64(uint64_t word, unsigned int shift) { - return (word >> shift) | (word << (64 - shift)); + return (word >> shift) | (word << ((64 - shift) & 63)); } /** |