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9ce4ac64b2
Various fmax and fmin function implementations mishandle sNaN arguments: (a) When both arguments are NaNs, the return value should be a qNaN, but sometimes it is an sNaN if at least one argument is an sNaN. (b) Under TS 18661-1 semantics, if either argument is an sNaN then the result should be a qNaN (whereas if one argument is a qNaN and the other is not a NaN, the result should be the non-NaN argument). Various implementations treat sNaNs like qNaNs here. This patch fixes the powerpc versions of these functions (shared by float and double, 32-bit and 64-bit). The structure of those versions is that all ordered cases are already handled before anything dealing with the case where the arguments are unordered; thus, this patch causes no change to the code executed in the common case (neither argument a NaN). Tested for powerpc (32-bit and 64-bit), together with tests to be added along with the x86_64 / x86 fixes. [BZ #20947] * sysdeps/powerpc/fpu/s_fmax.S (__fmax): Add the arguments when either is a signaling NaN. * sysdeps/powerpc/fpu/s_fmin.S (__fmin): Likewise. |
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