[LLVMbugs] [Bug 3529] New: clang/x86_64 miscompiles MultiSource/Benchmarks/mediabench/ adpcm/rawcaudio/rawcaudio

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=3529

           Summary: clang/x86_64 miscompiles
                    MultiSource/Benchmarks/mediabench/adpcm/rawcaudio/rawcau
                    dio
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: LLVM Codegen
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: daniel at zuster.org
                CC: llvmbugs at cs.uiuc.edu


clang/x86_64 miscompiles
MultiSource/Benchmarks/mediabench/adpcm/rawcaudio/rawcaudio

The generated executable does not function correctly:
--
ddunbar at lordcrumb:rawcaudio$ Output/rawcaudio.llc < ../data/clinton.pcm
input file: Invalid argument
--

This appears to be a misoptimization, compiling without -O3 works:
--
ddunbar at lordcrumb:rawcaudio$ xcc -std=gnu89
-I/Volumes/Data/ddunbar/llvm/projects/test-suite/MultiSource/Benchmarks/mediabench/adpcm/rawcaudio
-I/Users/ddunbar/llvm/projects/test-suite/MultiSource/Benchmarks/mediabench/adpcm/rawcaudio
-I/Users/ddunbar/llvm/include -I/Users/ddunbar/llvm/projects/test-suite/include
-I../../../../../include -I/Users/ddunbar/llvm/include -D_GNU_SOURCE
-D__STDC_LIMIT_MACROS -DNDEBUG -m64 -mllvm -disable-llvm-optzns
-mdynamic-no-pic -fomit-frame-pointer rawcaudio.c adpcm.c
ddunbar at lordcrumb:rawcaudio$ ./a.out < ../data/clinton.pcm > /dev/null
Final valprev=4085, index=8
ddunbar at lordcrumb:rawcaudio$ xcc -std=gnu89
-I/Volumes/Data/ddunbar/llvm/projects/test-suite/MultiSource/Benchmarks/mediabench/adpcm/rawcaudio
-I/Users/ddunbar/llvm/projects/test-suite/MultiSource/Benchmarks/mediabench/adpcm/rawcaudio
-I/Users/ddunbar/llvm/include -I/Users/ddunbar/llvm/projects/test-suite/include
-I../../../../../include -I/Users/ddunbar/llvm/include -D_GNU_SOURCE
-D__STDC_LIMIT_MACROS -DNDEBUG -m64 -mllvm -disable-llvm-optzns
-mdynamic-no-pic -fomit-frame-pointer rawcaudio.c adpcm.c -O3
ddunbar at lordcrumb:rawcaudio$ ./a.out < ../data/clinton.pcm > /dev/null
input file: Invalid argument
--


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