RKSimon added a comment. I haven't used the AVX512 versions, but I do know plenty of cases that rely on the 'use the second op if there is a NAN or both zeros' special cases in the SSE version of these FMIN/FMAX intrinsics.
The Intel docs state: > If the values being compared are both 0.0s (of either sign), the value in the > second operand (source operand) is returned. If a value in the second operand > is an SNaN, then SNaN is forwarded unchanged to the destination (that is, a > QNaN version of the SNaN is not returned). > If only one value is a NaN (SNaN or QNaN) for this instruction, the second > operand (source operand), either a NaN or a valid floating-point value, is > written to the result. If instead of this behavior, it is required that the > NaN source operand (from either the first or second operand) be returned, the > action of MAXPS can be emulated using a sequence of instructions, such as, a > comparison followed by AND, ANDN and OR. Repository: rC Clang https://reviews.llvm.org/D48487 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
