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Author SHA1 Message Date
Davide Italiano cd7c84bd8b Revert "[SCCP] Partially propagate informations when the input is not fully defined." 
This reverts commit r269105 as it caused PR27712.

llvm-svn: 269252
 2016-05-11 23:06:10 +00:00
Davide Italiano 7860c9bbf4 [SCCP] Partially propagate informations when the input is not fully defined. 
With this patch:
%r1 = lshr i64 -1, 4294967296 -> undef

Before this patch:
%r1 = lshr i64 -1, 4294967296 -> 0

llvm-svn: 269105
 2016-05-10 19:49:47 +00:00
David Majnemer e2a4b856d8 ConstantFold: Fix big shift constant folding 
Constant folding for shift IR instructions ignores all bits above 32 of
second argument (shift amount).
Because of that, some undef results are not recognized and APInt can
raise an assert failure if second argument has more than 64 bits.

Patch by Paweł Bylica!

Differential Revision: http://reviews.llvm.org/D7701

llvm-svn: 232176
 2015-03-13 16:39:46 +00:00