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xixiong
2012 Jan 04
1
[LLVMdev] How can I compile a c source file to use SSE2 Data Movement Instructions?
I write a small function and test it under clang and gcc,
filet test.c:
double X[100]; double Y[100]; double DA = 0.3;
int f()
{
int i;
for (i = 0; i < 100; i++)
Y[i] = Y[i] - DA * X[i];
return 0;
}
clang -S -O3 -o test.s test.c -march=native -ccc-echo
result:
"D:/work/trunk/bin/Release/clang.exe" -cc1 -triple i686-pc-win32 -S
-disable-fr
e -disable-llvm-verifier