Indeed it does seem to be an inlining issue.
As well as the compiler flags, you presented, you can also replicate using the following as well:For gdc:*'-g -O3' and*'-g -Os -frelease'
For gdmd: '-g -O -inline' and*'-g -O -release'In all cases, including the flag '-fno-inline' works around the problem.
Regards

--
Iain Buclaw

*(p < e ? p++ : p) = (c & 0x0f) + '0';