[PATCH] prevent folding a scalar FP load into a packed logical FP instruction (PR22371)

[Quentin Colombet]

Hi Sanjay,


================
Comment at: test/CodeGen/X86/logical-load-fold.ll:9
@@ +8,3 @@
+; executed as a scalar ('movs*') with a zero extension to
+; 128-bits and then used in the packed logical ('andp*') op. 
+; PR22371 - http://llvm.org/bugs/show_bug.cgi?id=22371
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Do we really care about that?

Unless we hit some read protection error, I do not see why reading undefined memory is a problem as long as we use only the part that is defined.
It seems that is the case in those cases, isn’t it?

http://reviews.llvm.org/D7474

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