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A couple of comments about this patch. First I think it will break the following for VMX: #include <altivec.h> vector unsigned short f(vector unsigned char a, vector unsigned char b) { return vec_vmuloub(a, b); }
Which is valid.
Second:Index: gcc/config/rs6000/altivec.h
I rather have you patch builtins to have the correct type, this will help memory usage with code with a lot of intrinsics and also fix vec_vmuloub testcase (as I think it is the same issue).
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