alpha-linux-gnu-gcc-5 (Ubuntu 5.5.0-12ubuntu1) 5.5.0 20171010 with qemu-alpha
version 2.11.1(Debian 1:2.11+dfsg-1ubuntu7.39)
trigger a FPE on the first iteration
None of the intermediate values when printed shows an anomaly nor does
casting the final value.
I did not investigate this further by looking at the asm but that would
be probably where to continue looking at this if someone is interrested
in alpha.
Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
---
libavcodec/ffv1enc.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/libavcodec/ffv1enc.c b/libavcodec/ffv1enc.c
index 9849082e44..9609877498 100644
--- a/libavcodec/ffv1enc.c
+++ b/libavcodec/ffv1enc.c
@@ -142,8 +142,10 @@ static void find_best_state(uint8_t best_state[256][256],
int i, j, k, m;
uint32_t l2tab[256];
- for (i = 1; i < 256; i++)
+ l2tab[1] = -log2(1 / 256.0) * ((1U << 31) / 8);
+ for (i = 2; i < 256; i++) {
l2tab[i] = -log2(i / 256.0) * ((1U << 31) / 8);
+ }
for (i = 0; i < 256; i++) {
uint64_t best_len[256];
--
2.17.1
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