51 lines
1003 B
Nix
51 lines
1003 B
Nix
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{ stdenv, writeText, which, strace }:
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let
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shuffle_c = writeText "shuffle.c" ''
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#include <stdio.h>
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typedef int v4si __attribute__ ((vector_size (16)));
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int main(void) {
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v4si a = {1,2,3,4};
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v4si b = {5,6,7,8};
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v4si mask1 = {0,1,1,3};
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v4si mask2 = {0,4,2,5};
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v4si res;
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#if defined(__GNUC__) && (__GNUC__ >= 7)
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res = __builtin_shuffle (a, mask1); /* res is {1,2,2,4} */
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res = __builtin_shuffle (a, b, mask2); /* res is {1,5,3,6} */
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printf("%d %d %d %d\n", res[0], res[1], res[2], res[3]);
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#endif
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return 0;
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}
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'';
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in
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stdenv.mkDerivation rec {
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version = "0.0.1";
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name = "hello-c";
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buildInputs = [ stdenv which strace ];
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src = hello_c;
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dontUnpack = true;
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dontConfigure = true;
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NIX_DEBUG = 0;
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buildPhase = ''
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cp $src hello.c
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set -x
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echo CC=$CC
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which $CC
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#strace -ff -e trace=execve -s99999999 $CC hello.c -o hello
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$CC hello.c -o hello
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./hello
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set +x
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'';
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installPhase = ''
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touch $out
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'';
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}
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