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Author SHA1 Message Date
Juergen Ributzka 9f54dbe7a1 Revert "[AArch64][FastISel] Add more truncation tests." and "[AArch64][FastISel] Always use an AND instruction when truncating to non-legal types." 
This reverts commit r243198 and 243304.

Turns out this wasn't the correct fix for this problem. It works only within
FastISel, but fails when the truncate is selected by SDAG.

llvm-svn: 244287
 2015-08-06 22:13:48 +00:00
Juergen Ributzka 6364985b58 [AArch64][FastISel] Always use an AND instruction when truncating to non-legal types. 
When truncating to non-legal types (such as i16, i8 and i1) always use an AND
instruction to mask out the upper bits. This was only done when the source type
was an i64, but not when the source type was an i32.

This commit fixes this and adds the missing i32 truncate tests.

This fixes rdar://problem/21990703.

llvm-svn: 243198
 2015-07-25 02:16:53 +00:00
Pete Cooper f52123b454 [AArch64] Fix sext/zext folding in address arithmetic. 
We were accidentally folding a sign/zero extend in to address arithmetic in a different BB when the extend wasn't available there.

Cross BB fast-isel isn't safe, so restrict this to only when the extend is in the same BB as the use.

llvm-svn: 236764
 2015-05-07 19:21:36 +00:00