This is split off from PR38474 for clarity. Compiling the testcase of that PR
(http://gcc.gnu.org/bugzilla/attachment.cgi?id=16873) as gfortran -ffree-line-length-512 -g -ffree-form -ftime-report -c -O3 -march=native -funroll-loops -fno-rename-registers testcase.f90 requires ~9.3Gb of RAM with mainline, while 4.3 only requires ~2.5Gb. -- Summary: [4.4 Regression] ira memory explosion Product: gcc Version: 4.4.0 Status: UNCONFIRMED Keywords: memory-hog Severity: normal Priority: P3 Component: rtl-optimization AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: jv244 at cam dot ac dot uk OtherBugsDependingO 38474 nThis: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38583
