[LLVMbugs] [Bug 15837] New: chromium libyuv source runs out of registers during register allocation

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=15837

            Bug ID: 15837
           Summary: chromium libyuv source runs out of registers during
                    register allocation
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: dimitry at andric.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 10421
  --> http://llvm.org/bugs/attachment.cgi?id=10421&action=edit
Runs out of registers when built with -O2 -fPIC -m32

A subcomponent of Chromium failed to compile with relatively recent clang 3.3,
giving the following error messages:

third_party/libyuv/source/row_posix.cc:1818:5: error: ran out of registers
during register allocation
    "movdqa    %[kShuffleMaskARGBToRGB24_0],%%xmm5 \n"
    ^
third_party/libyuv/source/row_posix.cc:1873:5: error: ran out of registers
during register allocation
    "movdqa    %[kShuffleMaskARGBToRAW_0],%%xmm5 \n"
    ^

Compilation flags: -O2 -fPIC -m32.  This used to compile with older versions of
clang: the last trunk version I had that was able to build it was r176408,
r178624 (the next one I had archived) was not able to build it anymore.

A reduced testcase is attached.

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