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* config/rs6000/rs6000.c (function_arg_boundary): Align for ABI_V4 when size is 8 bytes. (function_arg_advance): Account for stack space used by AltiVec args when -mabi=altivec. Simplify alignment calculations. For ABI_V4, pass AltiVec vectors by reference when -mabi=no-altivec. (function_arg): Similarly. (function_arg_pass_by_reference): True for ABI_V4 AltiVec when not AltiVec ABI. (rs6000_va_arg): Correct fp arg test. Adjust for AltiVec change. Correct alignment, and align before testing reg count. Remove TREE_THIS_VOLATILE from reg. Don't emit unused labels. (rs6000_complex_function_value): Check TARGET_HARD_FLOAT and TARGET_FPRS here.. (rs6000_function_value): .. not here before call. From-SVN: r81659
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