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if the alignment of an argument to a call is less than the specified byval alignment for that argument, there is no way to specify the alignment of the implied copy. Therefore, we must ensure that the alignment of the argument is at least the byval alignment. To do this, we have to mess with the alignment of relevant alloca's in some cases, and insert a copy that conceptually shouldn't be necessary in some cases.
This patch tries relatively hard to avoid creating an extra copy if it can be avoided (see test3 in the included testcase), but it is not possible to avoid in some cases (like test2 in the included testcase).
rdar://9483886
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@132957 91177308-0d34-0410-b5e6-96231b3b80d8
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rdar://problem/8139919 . This shouldn't make much of a difference at -O3, but should substantially reduce the number of generated memcpy's at -O0.
Originally r130717, but was backed out due to an ObjC regression.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@132102 91177308-0d34-0410-b5e6-96231b3b80d8
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git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@131057 91177308-0d34-0410-b5e6-96231b3b80d8
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rdar://problem/8139919 . This shouldn't make much of a difference at -O3, but should substantially reduce the number of generated memcpy's at -O0.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@130717 91177308-0d34-0410-b5e6-96231b3b80d8
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