[LLVMbugs] [Bug 452] NEW: memset analysis/optimizations need improving

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Wed Oct 20 10:46:06 PDT 2004


           Summary: memset analysis/optimizations need improving
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Interprocedural Optimizations
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: gaeke+bugs at uiuc.edu

Just so this doesn't get lost, I'm filing a "wishlist" item for this.

Date: Wed, 6 Oct 2004 14:25:30 -0500 (CDT)
From: Chris Lattner <sabre at nondot.org>
Subject: memset optimizations

memset currently inhibits multiple optimizations, e.g. memset/load doesn't
get copy-propagated, memset doesn't cause dead stores to die, and memset
inhibits SRA.  This should be fixed!

Also: memset(&X, 4) -> store int 0, X   iff X is aligned

Also, memset should not kill unaliased loads/stores.

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