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fix compilation for BITS 24

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in_bits is const. Trying to apply bswap on it, one gets the error message:
error: read-only variable 'in_bits' used as 'asm' output

Change-Id: I0bef494b822c83d8ea87b1938b0e486d94de4742
This commit is contained in:
skal 2013-08-20 18:55:00 -07:00
parent e58cc13706
commit be20decb5c
1 changed files with 6 additions and 3 deletions
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9
src/utils/bit_reader.h
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@ -54,7 +54,7 @@ extern "C" {
// And just after calling VP8LoadNewBytes(): // And just after calling VP8LoadNewBytes():
// [........vvvvvvvvBBBBBBBBBBBBBBBB]LSB || [........vvvvvvvvBBBBBBBBBBBBBBBB] // [........vvvvvvvvBBBBBBBBBBBBBBBB]LSB || [........vvvvvvvvBBBBBBBBBBBBBBBB]
// //
// -> we're back to height active 'value_' bits (marked 'v') and BITS cached // -> we're back to eight active 'value_' bits (marked 'v') and BITS cached
// bits (marked 'B') // bits (marked 'B')
// //
// The right-justify strategy tends to use less shifts and is often faster. // The right-justify strategy tends to use less shifts and is often faster.
@ -178,8 +178,11 @@ static WEBP_INLINE void VP8LoadNewBytes(VP8BitReader* const br) {
bits >>= 64 - BITS; bits >>= 64 - BITS;
#elif (BITS >= 24) #elif (BITS >= 24)
#if defined(__i386__) || defined(__x86_64__) #if defined(__i386__) || defined(__x86_64__)
__asm__ volatile("bswap %k0" : "=r"(in_bits) : "0"(in_bits)); {
bits = (bit_t)in_bits; // 24b/32b -> 32b/64b zero-extension lbit_t swapped_in_bits;
__asm__ volatile("bswap %k0" : "=r"(swapped_in_bits) : "0"(in_bits));
bits = (bit_t)swapped_in_bits; // 24b/32b -> 32b/64b zero-extension
}
#elif defined(_MSC_VER) #elif defined(_MSC_VER)
bits = (bit_t)_byteswap_ulong(in_bits); bits = (bit_t)_byteswap_ulong(in_bits);
#else #else