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3 Commits

Author SHA1 Message Date
Davide Italiano
e5b9c737be Revert "[SCCP] Partially propagate informations when the input is not fully defined." 
This reverts commit r269105 as it caused PR27712.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@269252 91177308-0d34-0410-b5e6-96231b3b80d8
 2016-05-11 23:06:10 +00:00
Davide Italiano
5f206cf7b0 [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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@269105 91177308-0d34-0410-b5e6-96231b3b80d8
 2016-05-10 19:49:47 +00:00
David Majnemer
790aec0651 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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232176 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-03-13 16:39:46 +00:00