[Bug middle-end/38848] Optimizer -O2 doesn't work on linear algebra code on double data type
--- Comment #5 from rguenth at gcc dot gnu dot org 2009-01-15 14:35 --- Thus invalid. -- rguenth at gcc dot gnu dot org changed: What|Removed |Added Status|WAITING |RESOLVED Resolution||INVALID http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38848
[Bug middle-end/38848] Optimizer -O2 doesn't work on linear algebra code on double data type
--- Comment #4 from rbenedik at fsmat dot htu dot tuwien dot ac dot at 2009-01-15 12:12 --- I traced the error back to a iteration scheme which is not stable when optmized with -O2. Sorry this was my fault, so theres no Bug in -O2: DTYPE FTYPE(SQUARE_ROOT)(DTYPE A) { DTYPE X_N1; DTYPE X_N2; X_N1=A; while(1) { X_N2 = (DTYPE)(1/2.0) * (X_N1+A/X_N1); if(X_N2 == X_N1) break; X_N1 = X_N2; } return X_N2; } -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38848
[Bug middle-end/38848] Optimizer -O2 doesn't work on linear algebra code on double data type
--- Comment #3 from rguenth at gcc dot gnu dot org 2009-01-14 22:25 --- You need to do some work to reduce this to a testcase. -- rguenth at gcc dot gnu dot org changed: What|Removed |Added Status|UNCONFIRMED |WAITING http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38848
[Bug middle-end/38848] Optimizer -O2 doesn't work on linear algebra code on double data type
--- Comment #2 from rbenedik at fsmat dot htu dot tuwien dot ac dot at 2009-01-14 21:50 --- I tried to make a single file from the code but the bug does not show up there. You can download the software at: http://fsmat.htu.tuwien.ac.at/~rbenedik/gauss-2.06.tar Run make clean; make and run lsq_perf_d 10 in the benchmark directory; float and extended do work on the System: e5200 @2.5 Ghz Fedora 10.0 64 bit double does not. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38848
[Bug middle-end/38848] Optimizer -O2 doesn't work on linear algebra code on double data type
--- Comment #1 from rguenth at gcc dot gnu dot org 2009-01-14 21:05 --- I cannot even compile or link this in any obvious way. gcc -o t t.c -DDOUBLE /usr/lib/gcc/i486-linux-gnu/4.3.2/../../../../lib/crt1.o: In function `_start': (.text+0x18): undefined reference to `main' /tmp/ccNVE5Zw.o: In function `LEAST_SQUARE_QR_d': t.c:(.text+0x67): undefined reference to `COPY_d' t.c:(.text+0x80): undefined reference to `COPY_d' t.c:(.text+0x111): undefined reference to `SQUARE_ROOT_d' t.c:(.text+0x1ae): undefined reference to `SQUARE_ROOT_d' t.c:(.text+0x5db): undefined reference to `SQUARE_ROOT_d' t.c:(.text+0x678): undefined reference to `SQUARE_ROOT_d' collect2: ld returned 1 exit status -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38848
[Bug middle-end/38848] Optimizer -O2 doesn't work on linear algebra code on double data type
-- pinskia at gcc dot gnu dot org changed: What|Removed |Added Severity|major |normal Component|c |middle-end http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38848