[libclc] Move minmag & maxmag to the CLC library #137982
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| const __CLC_GENTYPE res = __clc_select( | ||
| y, x, | ||
| __CLC_CONVERT_BIT_INTN(__clc_isgreater(__clc_fabs(x), __clc_fabs(y)))); | ||
| return __clc_select( | ||
| res, __clc_fmax(x, y), | ||
| __CLC_CONVERT_BIT_INTN(__clc_isnan(x) || __clc_isnan(y) || | ||
| __clc_isequal(__clc_fabs(x), __clc_fabs(y)))); |
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This seems like a lot more code than is needed. Why the isequal or conversions? This should be 1 fmax, 2 fabs + 2 select?
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Yeah, it does seem excessive. I don't really understand the isequal.
The conversions are necessary because select only accepts conditions of the same size as the vector, but the scalar relational functions unhelpfully return int even for double. There's no implicit conversions on vector types so we need the explicit select. This all comes out in the wash as in LLVM IR it's just i1 types fed from comparison to select anyway.
I've been wondering if we could alleviate this through extra overloads of __clc_select that accept intN conditions across the board, but that might also lead to some confusion.
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This can just use ternary operator, I don't see what the select is adding other than complexity
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