[PATCH] [X86, AVX] instcombine vperm2 intrinsics with zero inputs into shuffles

[Andrea Di Biagio]

LGTM. Thanks Sanjay!


================
Comment at: lib/Transforms/InstCombine/InstCombineCalls.cpp:222-230
@@ +221,11 @@
+
+    // The high bit of the selection field chooses from either the first
+    // operand or the second operand.
+    bool LowInputSelect = Imm & 0x02;
+    bool HighInputSelect = Imm & 0x20;
+
+    // The low bit of the selection field chooses from either the low or
+    // high half of the selected operand.
+    bool LowHalfSelect = Imm & 0x01;
+    bool HighHalfSelect = Imm & 0x10;
+
----------------
You can move this logic after line 235.

http://reviews.llvm.org/D8567

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