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Author SHA1 Message Date
Bill Wendling c80b6c92e2 Unify the lowering of arguments during SjLj prepare. 
The 'select true, %arg, undef' instruction can be used for both aggregate and
non-aggregate arguments.

llvm-svn: 212967
 2014-07-14 18:21:11 +00:00
Bill Wendling 151b44d653 Support lowering of empty aggregates. 
This crash was pretty common while compiling Rust for iOS (armv7). Reason -
SjLj preparation step was lowering aggregate arguments as ExtractValue +
InsertValue. ExtractValue has assertion which checks that there is some data in
value, which is not true in case of empty (no fields) structures. Rust uses
them quite extensively so this patch uses a 'select true, %val, undef'
instruction to lower the argument.

Patch by Valerii Hiora.

llvm-svn: 212922
 2014-07-14 06:22:36 +00:00