commit 8e4d0429de3d44a4c5b02b3d27cb0b78520609ba
author Eli Friedman <eli.friedman@gmail.com> Thu Oct 13 22:40:23 2011 +0000
committer Eli Friedman <eli.friedman@gmail.com> Thu Oct 13 22:40:23 2011 +0000
tree 2b931c339474fb7702d609e3b425c1e95dc9f8a9
parent 63b2f8c710ec42aa5304cbe8a5e8013e3ac66b8e

Simplify and avoid undefined shift.  Based on patch by Ahmed Charles.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141903 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/ARM/ARMISelLowering.cpp

diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp
index 0313f99..2ac52cf 100644
--- a/lib/Target/ARM/ARMISelLowering.cpp
+++ b/lib/Target/ARM/ARMISelLowering.cpp
@@ -3944,8 +3944,7 @@
       }
 
       // Try an immediate VMVN.
-      uint64_t NegatedImm = (SplatBits.getZExtValue() ^
-                             ((1LL << SplatBitSize) - 1));
+      uint64_t NegatedImm = (~SplatBits).getZExtValue();
       Val = isNEONModifiedImm(NegatedImm,
                                       SplatUndef.getZExtValue(), SplatBitSize,
                                       DAG, VmovVT, VT.is128BitVector(),