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Author SHA1 Message Date
Reid Kleckner 08f64e9083 Re-land r345676 "[Win64] Handle passing i128 by value" 
Fix the unintended switch/case fallthrough to avoid changing long double
behavior.

llvm-svn: 345748
 2018-10-31 17:43:55 +00:00
Richard Trieu 4ff6697b7e Revert r345676 due to test failure. 
This was causing CodeGen/mingw-long-double.c to start failing.

llvm-svn: 345691
 2018-10-31 02:10:51 +00:00
Reid Kleckner 0897caad30 [Win64] Handle passing i128 by value 
For arguments, pass it indirectly, since the ABI doc says pretty clearly
that arguments larger than 8 bytes are passed indirectly. This makes
va_list handling easier, anyway.

When returning, GCC returns in XMM0, and we match them.

Fixes PR39492.

llvm-svn: 345676
 2018-10-30 23:58:41 +00:00