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Patch from Denis Vlasenko to make unlzma smaller.
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478a188e85
commit
49a5599ae9
@ -56,7 +56,8 @@ typedef struct {
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#define RC_MODEL_TOTAL_BITS 11
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static speed_inline void rc_read(rc_t * rc)
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/* Called twice: once at startup and once in rc_normalize() */
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static void rc_read(rc_t * rc)
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{
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rc->buffer_size = read(rc->fd, rc->buffer, rc->buffer_size);
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if (rc->buffer_size <= 0)
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@ -65,6 +66,7 @@ static speed_inline void rc_read(rc_t * rc)
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rc->buffer_end = rc->buffer + rc->buffer_size;
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}
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/* Called once */
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static always_inline void rc_init(rc_t * rc, int fd, int buffer_size)
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{
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int i;
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@ -84,35 +86,50 @@ static always_inline void rc_init(rc_t * rc, int fd, int buffer_size)
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}
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}
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/* Called once. TODO: bb_maybe_free() */
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static always_inline void rc_free(rc_t * rc)
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{
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if (ENABLE_FEATURE_CLEAN_UP)
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free(rc->buffer);
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}
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/* Called twice, but one callsite is in speed_inline'd rc_is_bit_0_helper() */
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static void rc_do_normalize(rc_t * rc)
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{
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if (rc->ptr >= rc->buffer_end)
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rc_read(rc);
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rc->range <<= 8;
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rc->code = (rc->code << 8) | *rc->ptr++;
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}
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static always_inline void rc_normalize(rc_t * rc)
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{
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if (rc->range < (1 << RC_TOP_BITS)) {
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if (rc->ptr >= rc->buffer_end)
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rc_read(rc);
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rc->range <<= 8;
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rc->code = (rc->code << 8) | *rc->ptr++;
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rc_do_normalize(rc);
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}
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}
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static speed_inline int rc_is_bit_0(rc_t * rc, uint16_t * p)
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/* Called 9 times */
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/* Why rc_is_bit_0_helper exists?
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* Because we want to always expose (rc->code < rc->bound) to optimizer
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*/
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static speed_inline uint32_t rc_is_bit_0_helper(rc_t * rc, uint16_t * p)
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{
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rc_normalize(rc);
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rc->bound = *p * (rc->range >> RC_MODEL_TOTAL_BITS);
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return rc->code < rc->bound;
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return rc->bound;
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}
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static always_inline int rc_is_bit_0(rc_t * rc, uint16_t * p)
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{
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uint32_t t = rc_is_bit_0_helper(rc, p);
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return rc->code < t;
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}
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/* Called ~10 times, but very small, thus inlined */
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static speed_inline void rc_update_bit_0(rc_t * rc, uint16_t * p)
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{
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rc->range = rc->bound;
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*p += ((1 << RC_MODEL_TOTAL_BITS) - *p) >> RC_MOVE_BITS;
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}
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static speed_inline void rc_update_bit_1(rc_t * rc, uint16_t * p)
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{
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rc->range -= rc->bound;
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@ -120,7 +137,8 @@ static speed_inline void rc_update_bit_1(rc_t * rc, uint16_t * p)
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*p -= *p >> RC_MOVE_BITS;
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}
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static speed_inline int rc_get_bit(rc_t * rc, uint16_t * p, int *symbol)
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/* Called 4 times in unlzma loop */
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static int rc_get_bit(rc_t * rc, uint16_t * p, int *symbol)
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{
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if (rc_is_bit_0(rc, p)) {
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rc_update_bit_0(rc, p);
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@ -133,6 +151,7 @@ static speed_inline int rc_get_bit(rc_t * rc, uint16_t * p, int *symbol)
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}
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}
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/* Called once */
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static always_inline int rc_direct_bit(rc_t * rc)
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{
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rc_normalize(rc);
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@ -144,6 +163,7 @@ static always_inline int rc_direct_bit(rc_t * rc)
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return 0;
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}
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/* Called twice */
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static speed_inline void
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rc_bit_tree_decode(rc_t * rc, uint16_t * p, int num_levels, int *symbol)
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{
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