[cfe-dev] SSE intrinsics not being emitted by clang

[Reid Kleckner via cfe-dev]

I suspect this is because your tool is picking up MSVC's version of
xmmintrin.h instead of Clang's. Make sure that
HeaderSearchOptions::ResourceDir is set to something good. The resource
directory set by the driver is $(dirname path/to/clang)/../lib/clang/3.N.0.

It's been a long standing issue to make it easier for standalone tools to
find these headers, although I can't find the bugzilla issue for it.
http://lists.llvm.org/pipermail/cfe-dev/2014-November/040033.html

On Tue, May 3, 2016 at 7:37 AM, Sanee Berlow via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> Hello,
>
> I'm trying to use SSE intrinsic functions like _mm_store_ps from the
> header xmmintrin.h. I believe that the compiler is meant to provide the
> definitions for these functions, is that right? For some reason clang
> doesn't seem to be doing that so I'm getting undefined symbol errors while
> linking. This problem occurs when I invoke clang programatically, but not
> when I compile using the clang frontend executable, despite using the same
> arguments with both the executable and CompilerInvocation::CreateFromArgs.
> I'm trying to work out what could be causing this.
>
> So for instance, this works fine:
>
> F:\Clanggit\build\32\Release\bin>clang -cc1 -triple i686-pc-windows-msvc
> -emit-obj -mrelax-all -disable-free -disable-llvm-verifier
> -mrelocation-model static -mdisable-fp-elim -std=c++11 -masm-verbose
> -mconstructor-aliases -target-cpu pentium4 -D_MT --depe
> ndent-lib=libcmt --dependent-lib=oldnames -fdiagnostics-format msvc -D
> _HAS_EXCEPTIONS=1 -internal-isystem
> "F:\Clanggit\build\32\Debug\lib\clang\3.7.0\include" -internal-isystem
> "E:/Microsoft Visual Studio 12.0/VC/include" -internal-isystem "C:/Program
> Fil
> es (x86)/Windows Kits/8.1/Include" -internal-isystem
> "F:/git/scripta/trunk/include" -internal-isystem
> "F:\\Libraries\\eigen\\Eigen" -fno-dwarf-directory-asm -ferror-limit 19
> -fmessage-length 80 -mstackrealign -target-feature +sse4.2 -fms-extensions
> -fms-co
> mpatibility -fms-compatibility-version=18.00 -fobjc-runtime=gcc
> -fdiagnostics-show-option -fcolor-diagnostics -fdelayed-template-parsing
> -O3 -o outsource.obj -x c++  source.cpp -v
> clang -cc1 version 3.7.0 based upon LLVM 3.7.0svn default target
> i686-pc-windows-msvc
> #include "..." search starts here:
> #include <...> search starts here:
>  F:\Clanggit\build\32\Debug\lib\clang\3.7.0\include
>  E:/Microsoft Visual Studio 12.0/VC/include
>  C:/Program Files (x86)/Windows Kits/8.1/Include
>  F:/git/scripta/trunk/include
>  F:\\Libraries\\eigen\\Eigen
> End of search list.
>
> Resulting obj relocs from the above compilation using the clang frontend
> executable:
>
> File: outsource.obj
> Format: COFF-i386
> Arch: i386
> AddressSize: 32bit
> Relocations [
>   Section (1) .text {
>     0x7 IMAGE_REL_I386_DIR32 .rdata
>     0xC IMAGE_REL_I386_REL32 _puts
>     0x11 IMAGE_REL_I386_REL32 _getchar
>   }
>
> Resulting obj relocs from the obj created by the compiler instance
> invocation in my program (using the same arguments):
>
> File: temp
> Format: COFF-i386
> Arch: i386
> AddressSize: 32bit
> Relocations [
>   Section (1) .text {
>     0x26 IMAGE_REL_I386_DIR32 ??_C at _1LA@EKEBDMEJ
> @?$AA?4?$AA?1?$AAS?$AAc?$AAr?$AAi?$AAp?$AAt?$AAa?$AA?1?$AAs?$AAc?$AAr?$AAi?$AAp?$AAt?$AAs?$AA?1?$AA?4?$AA?4?$AA?1?$AA?4?$AA?4?$AA?1?$AA?4?$AA?4?$AA?1?$AA?4?$AA?4?$AA?1?$AA?4?$AA?4@
>     0x2D IMAGE_REL_I386_DIR32 ??_C at _1BIM@JPMPBING
> @?$AA?$CI?$AAr?$AAe?$AAi?$AAn?$AAt?$AAe?$AAr?$AAp?$AAr?$AAe?$AAt?$AA_?$AAc?$AAa?$AAs?$AAt?$AA?$DM?$AAs?$AAi?$AAz?$AAe?$AA_?$AAt?$AA?$DO?$AA?$CI?$AAa?$AAr?$AAr?$AAa?$AAy?$AA?$CJ@
>     0x32 IMAGE_REL_I386_REL32 __wassert
>     0x60 IMAGE_REL_I386_DIR32 .rdata
>     0x65 IMAGE_REL_I386_REL32 _puts
>     0x81 IMAGE_REL_I386_REL32 __mm_load_ps
>     0x94 IMAGE_REL_I386_REL32 __mm_load_ps
>     0xB4 IMAGE_REL_I386_REL32 __mm_store_ps
>     0xD4 IMAGE_REL_I386_REL32 __mm_store_ps
>     0xDB IMAGE_REL_I386_DIR32 .rdata
>     0xE0 IMAGE_REL_I386_REL32 _puts
>     0xE5 IMAGE_REL_I386_REL32 _getchar
>     0x10C IMAGE_REL_I386_DIR32 .rdata
>     0x111 IMAGE_REL_I386_REL32 _puts
>   }
>
>
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