search for: calltmp3

...un the code, the calls to sin and cos aren't optimized and, instead, I end up with: define double @foo(double %x) { entry: %calltmp = call double @sin(double %x) %calltmp1 = call double @sin(double %x) %multmp = fmul double %calltmp, %calltmp1 %calltmp2 = call double @cos(double %x) %calltmp3 = call double @cos(double %x) %multmp4 = fmul double %calltmp2, %calltmp3 %addtmp = fadd double %multmp, %multmp4 ret double %addtmp } How do you tell LLVM if a function has side effects or not? Cheers! - Rob

...un the code, the calls to sin and cos aren't optimized and, instead, I end up with: define double @foo(double %x) { entry: %calltmp = call double @sin(double %x) %calltmp1 = call double @sin(double %x) %multmp = fmul double %calltmp, %calltmp1 %calltmp2 = call double @cos(double %x) %calltmp3 = call double @cos(double %x) %multmp4 = fmul double %calltmp2, %calltmp3 %addtmp = fadd double %multmp, %multmp4 ret double %addtmp } How do you tell LLVM if a function has side effects or not? Cheers! - Rob _______________________________________________ LLVM Developers mailing list LL...

Chris Lattner <clattner at apple.com> writes: > On Nov 5, 2010, at 7:11 AM, Kirk Kelsey wrote: > >> I'm wondering what the longer term plans are for the C Backend. I >> understand it's not actively developed, even deprecated. What I'm not >> clear about is whether it's something that is viewed as non-vital and >> should just as well go away, or

...s(x)*cos(x); ready> Read function definition: define double @foo(double %x) { entry: %calltmp = call double @sin(double %x) %calltmp1 = call double @sin(double %x) %multmp = fmul double %calltmp, %calltmp1 %calltmp2 = call double @cos(double %x) %calltmp3 = call double @cos(double %x) %multmp4 = fmul double %calltmp2, %calltmp3 %addtmp = fadd double %multmp, %multmp4 ret double %addtmp }" - "extern putchard(x); putchard(120);": Again, on Windows, this doesn't work. To make it work, you have to...

...;) declare double @sin(double) readonly declare double @cos(double) readonly define double @foo(double %x) readonly { entry: %calltmp = call double @sin(double %x) %calltmp1 = call double @sin(double %x) %multmp = fmul double %calltmp, %calltmp1 %calltmp2 = call double @cos(double %x) %calltmp3 = call double @cos(double %x) %multmp4 = fmul double %calltmp2, %calltmp3 %addtmp = fadd double %multmp, %multmp4 ret double %addtmp }