https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64388
--- Comment #1 from dave.anglin at bell dot net --- On 2014-12-23, at 12:31 PM, hjl.tools at gmail dot com wrote: > On Linux/x86-64, r219037 caused > > FAIL: gcc.dg/pr44194-1.c scan-rtl-dump dse1 "global deletions = (2|3)" > FAIL: gcc.dg/pr44194-1.c scan-rtl-dump-not final "insn[: ][^\n]*set > \\(mem(?![^\n]*scratch)" The optimization could easily be restored if there was a procedure or target hook to provide a way to determine if a sibcall may read from the frame. On hppa-linux, this would be true if the sibcall arguments were all passed in registers. It might be possible to do this by analyzing the decl. The dse pass avoids looking at call usage information. -- John David Anglin dave.ang...@bell.net
