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author | Michael Sevakis <jethead71@rockbox.org> | 2008-04-16 20:44:10 +0000 |
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committer | Michael Sevakis <jethead71@rockbox.org> | 2008-04-16 20:44:10 +0000 |
commit | bbb0c3f397b5fb44bd13a3fbc6cf75260deb019f (patch) | |
tree | 6b474558f7449970a602da02c3e0d37973a2a0c8 /firmware/target/arm/system-arm.h | |
parent | a01996436d09eca8ae114e67005d2cac73cae7b3 (diff) | |
download | rockbox-bbb0c3f397b5fb44bd13a3fbc6cf75260deb019f.tar.gz rockbox-bbb0c3f397b5fb44bd13a3fbc6cf75260deb019f.zip |
Optimized byte-swapping macros for ARMv6.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17148 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'firmware/target/arm/system-arm.h')
-rw-r--r-- | firmware/target/arm/system-arm.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/firmware/target/arm/system-arm.h b/firmware/target/arm/system-arm.h index 5627475408..9ab2bfa57b 100644 --- a/firmware/target/arm/system-arm.h +++ b/firmware/target/arm/system-arm.h @@ -33,7 +33,14 @@ static inline uint16_t swap16(uint16_t value) result[ 7..0] = value[15..8]; */ { +#if ARM_ARCH >= 6 + uint32_t retval; + asm volatile ("revsh %0, %1" /* xxAB */ + : "=r"(retval) : "r"((uint32_t)value)); /* xxBA */ + return retval; +#else return (value >> 8) | (value << 8); +#endif } static inline uint32_t swap32(uint32_t value) @@ -44,6 +51,12 @@ static inline uint32_t swap32(uint32_t value) result[ 7.. 0] = value[31..24]; */ { +#if ARM_ARCH >= 6 + uint32_t retval; + asm volatile ("rev %0, %1" /* ABCD */ + : "=r"(retval) : "r"(value)); /* DCBA */ + return retval; +#else uint32_t tmp; asm volatile ( @@ -54,6 +67,7 @@ static inline uint32_t swap32(uint32_t value) : "+r" (value), "=r" (tmp) ); return value; +#endif } static inline uint32_t swap_odd_even32(uint32_t value) @@ -62,6 +76,12 @@ static inline uint32_t swap_odd_even32(uint32_t value) result[31..24],[15.. 8] = value[23..16],[ 7.. 0] result[23..16],[ 7.. 0] = value[31..24],[15.. 8] */ +#if ARM_ARCH >= 6 + uint32_t retval; + asm volatile ("rev16 %0, %1" /* ABCD */ + : "=r"(retval) : "r"(value)); /* BADC */ + return retval; +#else uint32_t tmp; asm volatile ( /* ABCD */ @@ -72,6 +92,7 @@ static inline uint32_t swap_odd_even32(uint32_t value) : "+r" (value), "=r" (tmp) /* BADC */ ); return value; +#endif } /* Core-level interrupt masking */ |