[Bug 92214] Flightgear crashes during splashboot with R600 driver, LLVM 3.7.0 and mesa 11.0.2

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92214

--- Comment #39 from Barto <mister.freeman at laposte.net> ---
thanks Jose for this patch

just for the record : in 2013 in llvm's bugzilla someone has already opened a
bug report about the same problem ( his pentium dual core was treaten as penryn
instead of core2 by llvm, which triggers bug about SSE4.1 ) :

https://llvm.org/bugs/show_bug.cgi?id=16721

at that time the solution found by Benjamin Kramer was to fix the problem by
adding the "SSE4.1 test" in /lib/Support/Host.cpp :

http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20130729/182469.html

unfortunately this fix was deleted by Craig Cooper with his commit
cd83d5b5071f072882ad06cc4b904b2d27d1e54a in march 2015

gcc seems to handle this problem differently, my pentium dual core is
identified as "core2" when I use "-march=native" : 

$ gcc -march=native -Q --help=target | grep march
  -march=                               core2

$  gcc -march=native -Q --help=target | grep sse
  -mno-sse4                             [enabled]
  -msse                                 [enabled]
  -msse2                                [enabled]
  -msse2avx                             [disabled]
  -msse3                                [enabled]
  -msse4                                [disabled]
  -msse4.1                              [disabled]
  -msse4.2                              [disabled]
  -msse4a                               [disabled]
  -msse5                      
  -msseregparm                          [disabled]
  -mssse3                               [enabled]

but with clang 3.7.0 the "-march=native" argument leads to "cpu penryn" with
maybe the use of sse4.1 even if the CPU is a pentium dual core who doesn't
support sse4.1

$ clang -v -E -march=native -

 "/usr/bin/clang-3.7" -cc1 -triple x86_64-unknown-linux-gnu -E -disable-free
-disable-llvm-verifier -main-file-name - -mrelocation-model static
-mthread-model posix -mdisable-fp-elim -fmath-errno -masm-verbose
-mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu penryn
-target-feature -sse4a -target-feature -avx512bw -target-feature +cx16
-target-feature -tbm -target-feature -adx -target-feature -fma4 -target-feature
-avx512vl -target-feature -prfchw -target-feature -bmi2 -target-feature
-avx512pf -target-feature -fsgsbase -target-feature -avx -target-feature
-avx512cd -target-feature -rtm -target-feature -popcnt -target-feature -fma
-target-feature -bmi -target-feature -aes -target-feature -rdrnd
-target-feature -sse4.1 -target-feature -sse4.2 -target-feature -avx2
-target-feature -avx512er -target-feature +sse -target-feature -lzcnt
-target-feature -pclmul -target-feature -avx512f -target-feature -f16c
-target-feature +ssse3 -target-feature +mmx -target-feature +cmov

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