Date: Fri, 28 Jul 2017 20:13:36 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-ports-bugs@FreeBSD.org Subject: [Bug 219139] [exp-run] Against projects/clang500-import branch Message-ID: <bug-219139-13-jqN49fmriw@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-219139-13@https.bugs.freebsd.org/bugzilla/> References: <bug-219139-13@https.bugs.freebsd.org/bugzilla/>
next in thread | previous in thread | raw e-mail | index | archive | help
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D219139 --- Comment #16 from commit-hook@freebsd.org --- A commit references this bug: Author: dim Date: Fri Jul 28 20:13:25 UTC 2017 New revision: 321664 URL: https://svnweb.freebsd.org/changeset/base/321664 Log: Pull in r308891 from upstream llvm trunk (by Benjamin Kramer): [CodeGenPrepare] Cut off FindAllMemoryUses if there are too many uses. This avoids excessive compile time. The case I'm looking at is Function.cpp from an old version of LLVM that still had the giant memcmp string matcher in it. Before r308322 this compiled in about 2 minutes, after it, clang takes infinite* time to compile it. With this patch we're at 5 min, which is still bad but this is a pathological case. The cut off at 20 uses was chosen by looking at other cut-offs in LLVM for user scanning. It's probably too high, but does the job and is very unlikely to regress anything. Fixes PR33900. * I'm impatient and aborted after 15 minutes, on the bug report it was killed after 2h. Pull in r308986 from upstream llvm trunk (by Simon Pilgrim): [X86][CGP] Reduce memcmp() expansion to 2 load pairs (PR33914) D35067/rL308322 attempted to support up to 4 load pairs for memcmp inlining which resulted in regressions for some optimized libc memcmp implementations (PR33914). Until we can match these more optimal cases, this patch reduces the memcmp expansion to a maximum of 2 load pairs (which matches what we do for -Os). This patch should be considered for the 5.0.0 release branch as well Differential Revision: https://reviews.llvm.org/D35830 These fix a hang (or extremely long compile time) when building older LLVM ports. Reported by: antoine PR: 219139 Changes: head/contrib/llvm/lib/CodeGen/CodeGenPrepare.cpp head/contrib/llvm/lib/Target/X86/X86ISelLowering.cpp --=20 You are receiving this mail because: You are on the CC list for the bug.=
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?bug-219139-13-jqN49fmriw>