From: Jonathan Rosser <[EMAIL PROTECTED]>
no direct speedup but there looks like mmx type optimisations are now possible
as range and code and range_x_prob are now all bit aligned.
Signed-off-by: David Flynn <[EMAIL PROTECTED]>
---
schroedinger/schroarith.c | 2 +-
schroedinger/schroarith.h | 8 ++++----
2 files changed, 5 insertions(+), 5 deletions(-)
diff --git a/schroedinger/schroarith.c b/schroedinger/schroarith.c
index f251507..957ee66 100644
--- a/schroedinger/schroarith.c
+++ b/schroedinger/schroarith.c
@@ -144,7 +144,7 @@ schro_arith_decode_init (SchroArith *arith, SchroBuffer
*buffer)
memset(arith, 0, sizeof(SchroArith));
arith->range[0] = 0;
- arith->range[1] = 0xffff;
+ arith->range[1] = 0xffff0000;
arith->range_size = arith->range[1] - arith->range[0];
arith->code = 0;
arith->cntr = 16;
diff --git a/schroedinger/schroarith.h b/schroedinger/schroarith.h
index 42f92c6..5f6c498 100644
--- a/schroedinger/schroarith.h
+++ b/schroedinger/schroarith.h
@@ -159,7 +159,7 @@ _schro_arith_decode_bit (SchroArith *arith, unsigned int i)
register unsigned int range = arith->range[1];
register unsigned int code_minus_low = arith->code;
- while (range <= 0x4000) {
+ while (range <= 0x40000000) {
range <<= 1;
code_minus_low <<= 1;
@@ -183,14 +183,14 @@ _schro_arith_decode_bit (SchroArith *arith, unsigned int
i)
}
}
- range_x_prob = (range * arith->probabilities[i]) >> 16;
+ range_x_prob = ((range >> 16) * arith->probabilities[i]) & 0xFFFF0000;
lut_index = arith->probabilities[i]>>7 & ~1;
- value = ((code_minus_low >> 16) >= range_x_prob);
+ value = (code_minus_low >= range_x_prob);
arith->probabilities[i] += arith->lut[lut_index | value];
if (value) {
- code_minus_low -= range_x_prob << 16;
+ code_minus_low -= range_x_prob;
range -= range_x_prob;
} else {
range = range_x_prob;
--
1.5.5
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