[LLVMbugs] [Bug 18067] New: GVN Miscompile

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Tue Nov 26 09:03:35 PST 2013


            Bug ID: 18067
           Summary: GVN Miscompile
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: hfinkel at anl.gov
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 11613
  --> http://llvm.org/bugs/attachment.cgi?id=11613&action=edit
bugpoint reduced test case

ClangBugs2/diff/t65630 from PR16431 is a GVN miscompile:

To reproduce:

opt -basicaa -gvn bugpoint-tooptimize.bc -o opt.bc
clang opt.bc bugpoint-tonotoptimize.bc -o t

./t < input.txt
res = 4272243118

whereas running:

clang bugpoint-tooptimize.bc bugpoint-tonotoptimize.bc -o t

./t < input.txt 
res = 4294956171

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