[PATCH] D26521: [X86] Allow folding of reloads from stack slots when loading a subreg of the spilled reg

[Michael Kuperstein via llvm-commits]

mkuper added inline comments.


================
Comment at: include/llvm/Target/TargetInstrInfo.h:821
+  /// Check whether the target can fold a load that feeds a subreg operand MO
+  /// (or a subreg operand MO that feeds a store).
+  /// This can be used to check the foldability of both loads and stores.
----------------
qcolombet wrote:
> I am not sure I understand the intent. I believe this is just a problem of wording.
> Basically, are you referring to this case:
> v1 = ld
> = op v1.sub
> 
> or this case:
> v1.sub = ld
> = op v1.sub
> 
> I believe this is the former and adding the example would help :).
Yes, it's the former, I'll add an example, thanks!


https://reviews.llvm.org/D26521