With this compiler [luc...@descartes gambit]$ gcc -v Using built-in specs. Target: powerpc64-unknown-linux-gnu Configured with: ../../gcc-4.3.3/configure --prefix=/pkgs/gcc-4.3.3 --enable-languages=c --with-cpu=default64 Thread model: posix gcc version 4.3.3 (GCC)
with the file compiler.i found here: http://www.math.purdue.edu/~lucier/bugzilla/8/ attempting to compile with these options: gcc -m64 -mcpu=970 -Wall -W -Wno-unused -O1 -fno-math-errno -fschedule-insns2 -fno-trapping-math -fno-strict-aliasing -fwrapv -fomit-frame-pointer -fPIC -fno-common -rdynamic -shared can't compile in 8GB of RAM. With this compiler: euler-77% /pkgs/gcc-4.2.3/bin/gcc -v Using built-in specs. Target: x86_64-unknown-linux-gnu Configured with: ../../gcc-4.2.3/configure --prefix=/pkgs/gcc-4.2.3 --enable-checking=release --with-gmp=/pkgs/gmp-4.2.2 --with-mpfr=/pkgs/gmp-4.2.2 Thread model: posix gcc version 4.2.3 and these options: gcc -Wall -W -Wno-unused -O1 -fno-math-errno -fschedule-insns2 -fno-trapping-math -fno-strict-aliasing -fwrapv -fomit-frame-pointer -fPIC -fno-common -mieee-fp -rdynamic -shared it can't compiler in 20GB of RAM. (That machine has only 16GB of RAM, so I killed the compile when it hit 20GB of physical+virtual memory.) It compiles just fine in about 1GB of RAM with euler-76% gcc -v Using built-in specs. Target: x86_64-unknown-linux-gnu Configured with: ../configure --prefix=/pkgs/gcc-4.1.2 Thread model: posix gcc version 4.1.2 compiler.i is the output from the Gambit Scheme->C compiler; the source scheme program is from a standard benchmark suite for Scheme compilers. So I found this by trying to change the code generator for Gambit and running the benchmark suite on x86_64. I don't know how this can be "fixed". Basically, the entire middle-end infrastructure since 4.1.* is telling people like me with computer-generated code like this to just go away (to put it very politely). On Mac OS X 10.5.*, Apple bundles their version of 4.0.1, which compiles this just fine; on Red Hat 5.2, they bundle their version of 4.1.2 (I think, my RH5.2 box is down at the moment), which compiles this just fine; but on Ubuntu 8.10 or Fedora 10 you can't compile this because they bundle newer compilers. (I guess I'll see if I can install 4.1.* on both of these.) As a stopgap measure, perhaps someone can tell me what optimization level to use. As you can see, I use -O1 and a few others (mainly -fschedule-insns2). gcc 4.1.* and earlier compiled something like this just fine, but -O1 must mean something different now. -- Summary: Code that compiles fine in 1GB of memory with 4.1.2 requires > 20GB in 4.2.* and higher Product: gcc Version: 4.3.3 Status: UNCONFIRMED Severity: major Priority: P3 Component: middle-end AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: lucier at math dot purdue dot edu GCC build triplet: x86_64-unknown-linux-gnu GCC host triplet: x86_64-unknown-linux-gnu GCC target triplet: x86_64-unknown-linux-gnu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39157
