https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114881
Bug ID: 114881 Summary: Very slow compilation on SPARC Product: gcc Version: 15.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: rtl-optimization Assignee: unassigned at gcc dot gnu.org Reporter: ian at airs dot com Target Milestone: --- Created attachment 58059 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=58059&action=edit Test case This is repeat of PR 53125, which was closed in 2012. The attached test case is a conversion to C of a machine generated test case in Go (the machine generated Go source is in gcc/testsuite/go.test/test/cmplxdivide1.go). When I compile this test case without optimization on an x86_64 GNU/Linux system, it takes 9.7 seconds. With -O2 it takes 4.9 seconds. When I compile this test case without optimization on a SPARC Solaris 2.11 system, it takes 3 minutes 30 seconds. With -O2 it takes 2 minutes 30 seconds. The SPARC machine is slower than the x86_64 machine. But it's not that much slower. The time difference is extreme. In -ftime-report on the SPARC system, most of the time is: integrated RA : 33.43 ( 16%) 0.05 ( 4%) 33.56 ( 16%) 12M ( 14%) LRA hard reg assignment : 144.62 ( 70%) 0.35 ( 30%) 145.52 ( 70%) 0 ( 0%)