Bug 17098 – Takes hours to -O compile then fails with Internal error: backend/cgreg.c 405

Created attachment 1634 code that no longer compiles in 2073 any this program always takes forever to compile. It always compiled and executed on dmd 2072.2 and below. Now the compiler takes forever and says out of memory, no info,just out of memory. I am using Windows 10 64 bit, I have tried to compile for 64 and 32, both take forever to finally quit compiling the code. Does not compile on Mac also. 2073 betas.

Work for me on linux, but uses ~1.2GiB to compile. The current CTFE interpreter easily uses a lot of memory, see issue 6498. We're working on a replacement interpreter, but it's not quite ready yet [¹]. I guess you simply hit a memory limit for 32-bit processes on Windows now, will test later on Win. As a workaround you can use the 64-bit version of dmd. As that uses the VC linker and libc, you need VisualStudio installed, the Win installer should know how to do/find that [²]. [¹]: http://forum.dlang.org/post/[email protected] [²]: https://github.com/dlang/installer/blob/5179af93d9f0fd84d714e8742492434bf16ed2f6/windows/d2-installer.nsi#L351

It does not compile with 32 or 64 bit. dmd -m64 .... it fails also and takes forever.

> dmd -m64 .... Which command are you using exactly to compile? I'm getting extremely slow builds when passing -O, that's due to the huge amount of statements your throwing at the compiler (in the mixin). But this is not new, 2.072 is as slow at optimizing it as well, so it might be a duplicate of issue 7157. If you really need the optimization, both gdc and ldc are doing better with this, though it still takes them a considerable amount of time.

dmd eventually finished after some whooping 14,5 minutes :o, but ran into a codegen issue, same with 2.071.2, both on linux-64. Internal error: backend/cgreg.c 405 865.86user 0.49system 14:29.65elapsed 99%CPU (0avgtext+0avgdata 1498680maxresident)k 7232inputs+0outputs (32major+374040minor)pagefaults 0swaps That smells a bit like an overflow issue https://github.com/dlang/dmd/blob/a5f823a59d11bb02a56384891eb80a55af467e00/src/backend/cgreg.c#L405, would be hard to believe for `int` though.

Here's the attached program: tring ctbf(in string code) pure nothrow { string r; foreach (immutable c; code) switch (c) { case '>': r ~= "i++; assert(i < m.length);"; break; case '<': r ~= "i--; assert(i >= 0);"; break; case '+': r ~= "m[i]++;"; break; case '-': r ~= "m[i]--;"; break; case '[': r ~= "while (m[i]) {"; break; case ']': r ~= "}"; break; case '.': r ~= "m[i].putchar;"; break; case ',': r ~= "{ int d = getchar; if (d == EOF) exit(1); m[i] = cast(char)d; }"; break; default: break; } return r; } void main() { import core.stdc.stdio, core.stdc.stdlib; char[30_000] m = '\0'; size_t i; mixin(ctbf(" A mandelbrot set fractal viewer in brainf*** written by Erik Bosman +++++++++++++[->++>>>+++++>++>+<<<<<<]>>>>>++++++>--->>>>>>>>>>+++++++++++++++[[ >>>>>>>>>]+[<<<<<<<<<]>>>>>>>>>-]+[>>>>>>>>[-]>]<<<<<<<<<[<<<<<<<<<]>>>>>>>>[-]+ <<<<<<<+++++[-[->>>>>>>>>+<<<<<<<<<]>>>>>>>>>]>>>>>>>+>>>>>>>>>>>>>>>>>>>>>>>>>> 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(In reply to Martin Nowak from comment #1) > The current CTFE interpreter easily uses a lot of memory, True, but that isn't the cause of the failure to compile. The compile takes only a second or two without -O, and the CTFE is still run.

Definitely a problem with integer overflowing Sweight in cgreg.d

@WalterBright created dlang/dmd pull request #10789 "fix Issue 17098 - Takes hours to -O compile then fails with Internal …" fixing this issue: - fix Issue 17098 - Takes hours to -O compile then fails with Internal error: backend/cgreg.c 405 https://github.com/dlang/dmd/pull/10789

Won't fix the compile time problem, as that is inherent with the quadratic behavior of the optimizer. Just fixing the assert failure.

dlang/dmd pull request #10789 "fix Issue 17098 - Takes hours to -O compile then fails with Internal …" was merged into master: - d20cafb48f4e0072d0ba31ca82ee51ecc4699fc0 by Walter Bright: fix Issue 17098 - Takes hours to -O compile then fails with Internal error: backend/cgreg.c 405 https://github.com/dlang/dmd/pull/10789