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d768ac0395
libclc was defining and undefing GENTYPE and several other macros with common names in its header files. This was preventing applications from defining macros with identical names as command line arguments to the compiler, because the definitions in the header files were masking the macros defined as compiler arguements. Reviewed-by: Aaron Watry <awatry@gmail.com> llvm-svn: 185838
43 lines
1.6 KiB
C++
43 lines
1.6 KiB
C++
/**
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* Not necessarily optimal... but it produces correct results (at least for int)
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* If we're lucky, LLVM will recognize the pattern and produce rotate
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* instructions:
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* http://llvm.1065342.n5.nabble.com/rotate-td47679.html
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*
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* Eventually, someone should feel free to implement an llvm-specific version
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*/
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_CLC_OVERLOAD _CLC_DEF __CLC_GENTYPE rotate(__CLC_GENTYPE x, __CLC_GENTYPE n){
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//Try to avoid extra work if someone's spinning the value through multiple
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//full rotations
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n = n % (__CLC_GENTYPE)__CLC_GENSIZE;
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#ifdef __CLC_SCALAR
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if (n > 0){
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return (x << n) | (((__CLC_U_GENTYPE)x) >> (__CLC_GENSIZE - n));
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} else if (n == 0){
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return x;
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} else {
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return ( (((__CLC_U_GENTYPE)x) >> -n) | (x << (__CLC_GENSIZE + n)) );
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}
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#else
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//XXX: There's a lot of __builtin_astype calls to cast everything to
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// unsigned ... This should be improved so that if __CLC_GENTYPE==__CLC_U_GENTYPE, no
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// casts are required.
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__CLC_U_GENTYPE x_1 = __builtin_astype(x, __CLC_U_GENTYPE);
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//XXX: Is (__CLC_U_GENTYPE >> S__CLC_GENTYPE) | (__CLC_U_GENTYPE << S__CLC_GENTYPE) legal?
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// If so, then combine the amt and shifts into a single set of statements
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__CLC_U_GENTYPE amt;
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amt = (n < (__CLC_GENTYPE)0 ? __builtin_astype((__CLC_GENTYPE)0-n, __CLC_U_GENTYPE) : (__CLC_U_GENTYPE)0);
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x_1 = (x_1 >> amt) | (x_1 << ((__CLC_U_GENTYPE)__CLC_GENSIZE - amt));
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amt = (n < (__CLC_GENTYPE)0 ? (__CLC_U_GENTYPE)0 : __builtin_astype(n, __CLC_U_GENTYPE));
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x_1 = (x_1 << amt) | (x_1 >> ((__CLC_U_GENTYPE)__CLC_GENSIZE - amt));
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return __builtin_astype(x_1, __CLC_GENTYPE);
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#endif
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}
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