search for: bswapsi2

Hi @ll, targetting i386, LLVM/clang generates wrong code for the following functions: unsigned long __bswapsi2 (unsigned long ul) { return (((ul) & 0xff000000ul) >> 3 * 8) | (((ul) & 0x00ff0000ul) >> 8) | (((ul) & 0x0000ff00ul) << 8) | (((ul) & 0x000000fful) << 3 * 8); } unsigned long long __bswapdi2(unsigned long long ull) {...

...ed into edx. Bits 63:32 are loaded into eax. Those are each bswapped. The ABI for the return is edx contains bits [63:32] and eax contains [31:0]. This is opposite of how the register were loaded. ~Craig On Sun, Nov 25, 2018 at 10:36 AM Craig Topper <craig.topper at gmail.com> wrote: > bswapsi2 on the x86-64 isn't using the bswap instruction because "unsigned > long" is 64-bits on x86-64 linux. But its 32-bits on x86-64 msvc. > > Not sure about the bswapdi2 i386 case. > > > ~Craig > > > On Sun, Nov 25, 2018 at 8:03 AM Stefan Kanthak via llvm-dev &l...

...done -- Build files have been written to: /home/llvm_all/buildrtonly -------------------------------------- ninja output: root at christian-forschung-virtual-machine:/home/llvm_all/buildrtonly# ninja builtins [1/207] Building ASM object lib/builtins/CMakeFiles/clang_rt.builtins-armhf.dir/arm/bswapsi2.S.o FAILED: lib/builtins/CMakeFiles/clang_rt.builtins-armhf.dir/arm/bswapsi2.S.o /usr/local/myclang/bin/clang -DVISIBILITY_HIDDEN -fno-lto -std=c11 -fPIC -fno-builtin -fvisibility=hidden -fomit-frame-pointer -fomit-frame-pointer -DCOMPILER_RT_ARMHF_TARGET -MD -MT lib/builtins/CMakeFiles/clang_...

I am currently trying to compile a pretty simple program to work on an experimental board. It contains an (FPGA-version of) an ARMv4 processor. So basically, I try this (on my Ubuntu 18.04.1 LTS): clang -v --target=arm-none-eabi -c barehello.c -o barehelloCLANG.o clang -v --target=arm-none-eabi -c io.c -o io.o clang -v --target=arm-none-eabi barehelloCLANG.o io.o -o helloCLANGstatic -static

...gt; >> -------------------------------------- >> >> ninja output: >> >> >> root at christian-forschung-virtual-machine:/home/llvm_all/buildrtonly# ninja builtins >> >> [1/207] Building ASM object lib/builtins/CMakeFiles/clang_rt.builtins-armhf.dir/arm/bswapsi2.S.o >> FAILED: lib/builtins/CMakeFiles/clang_rt.builtins-armhf.dir/arm/bswapsi2.S.o >> /usr/local/myclang/bin/clang -DVISIBILITY_HIDDEN -fno-lto -std=c11 -fPIC -fno-builtin -fvisibility=hidden -fomit-frame-pointer -fomit-frame-pointer -DCOMPILER_RT_ARMHF_TARGET -MD -MT lib/builtins/CMa...

...gt; >> -------------------------------------- >> >> ninja output: >> >> >> root at christian-forschung-virtual-machine:/home/llvm_all/buildrtonly# ninja builtins >> >> [1/207] Building ASM object lib/builtins/CMakeFiles/clang_rt.builtins-armhf.dir/arm/bswapsi2.S.o >> FAILED: lib/builtins/CMakeFiles/clang_rt.builtins-armhf.dir/arm/bswapsi2.S.o >> /usr/local/myclang/bin/clang -DVISIBILITY_HIDDEN -fno-lto -std=c11 -fPIC -fno-builtin -fvisibility=hidden -fomit-frame-pointer -fomit-frame-pointer -DCOMPILER_RT_ARMHF_TARGET -MD -MT lib/builtins/CMa...

...> -------------------------------------- > > > > ninja output: > > > > > > root at christian-forschung-virtual-machine:/home/llvm_all/buildrtonly# ninja builtins > > > > [1/207] Building ASM object lib/builtins/CMakeFiles/clang_rt.builtins-armhf.dir/arm/bswapsi2.S.o > > FAILED: lib/builtins/CMakeFiles/clang_rt.builtins-armhf.dir/arm/bswapsi2.S.o > > /usr/local/myclang/bin/clang -DVISIBILITY_HIDDEN -fno-lto -std=c11 -fPIC -fno-builtin -fvisibility=hidden -fomit-frame-pointer -fomit-frame-pointer -DCOMPILER_RT_ARMHF_TARGET -MD -MT lib/builtins/C...

...t;> > >>> ninja output: > >>> > >>> > >>> root at christian-forschung-virtual-machine:/home/llvm_all/buildrtonly# ninja builtins > >>> > >>> [1/207] Building ASM object lib/builtins/CMakeFiles/clang_rt.builtins-armhf.dir/arm/bswapsi2.S.o > >>> FAILED: lib/builtins/CMakeFiles/clang_rt.builtins-armhf.dir/arm/bswapsi2.S.o > >>> /usr/local/myclang/bin/clang -DVISIBILITY_HIDDEN -fno-lto -std=c11 -fPIC -fno-builtin -fvisibility=hidden -fomit-frame-pointer -fomit-frame-pointer -DCOMPILER_RT_ARMHF_TARGET -MD -M...

...to: /home/llvm_all/buildrtonly > > -------------------------------------- > > ninja output: > > > root at christian-forschung-virtual-machine:/home/llvm_all/buildrtonly# ninja builtins > > [1/207] Building ASM object lib/builtins/CMakeFiles/clang_rt.builtins-armhf.dir/arm/bswapsi2.S.o > FAILED: lib/builtins/CMakeFiles/clang_rt.builtins-armhf.dir/arm/bswapsi2.S.o > /usr/local/myclang/bin/clang -DVISIBILITY_HIDDEN -fno-lto -std=c11 -fPIC -fno-builtin -fvisibility=hidden -fomit-frame-pointer -fomit-frame-pointer -DCOMPILER_RT_ARMHF_TARGET -MD -MT lib/builtins/CMakeFiles/...

..., rdx > ; perform _bswapdi2() in native 64-bit mode > bswap rdi > ; compare results > xor rax, rdi > > not amused > Stefan Kanthak > > > On Sun, Nov 25, 2018 at 10:36 AM Craig Topper <craig.topper at gmail.com> > > wrote: > > > >> bswapsi2 on the x86-64 isn't using the bswap instruction because > "unsigned > >> long" is 64-bits on x86-64 linux. But its 32-bits on x86-64 msvc. > >> > >> Not sure about the bswapdi2 i386 case. > >> > >> > >> ~Craig > >> >...

...to: /home/llvm_all/buildrtonly > > -------------------------------------- > > ninja output: > > > root at christian-forschung-virtual-machine:/home/llvm_all/buildrtonly# ninja builtins > > [1/207] Building ASM object lib/builtins/CMakeFiles/clang_rt.builtins-armhf.dir/arm/bswapsi2.S.o > FAILED: lib/builtins/CMakeFiles/clang_rt.builtins-armhf.dir/arm/bswapsi2.S.o > /usr/local/myclang/bin/clang -DVISIBILITY_HIDDEN -fno-lto -std=c11 -fPIC -fno-builtin -fvisibility=hidden -fomit-frame-pointer -fomit-frame-pointer -DCOMPILER_RT_ARMHF_TARGET -MD -MT lib/builtins/CMakeFiles/...