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[Power9] Ensure float128 in non-homogenous aggregates are passed via …
…VSX reg Non-homogenous aggregates are passed in consecutive GPRs, in GPRs and in memory, or in memory. This patch ensures that float128 members of non-homogenous aggregates are passed via VSX registers. This is done via custom lowering a bitcast of a build_pari(i64,i64) to float128 to a new PPCISD node, BUILD_FP128. Differential Revision: https://reviews.llvm.org/D48308 llvm-svn: 336310
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