From 6c9b8d3d411b0ee65263dc41d2b953fe118cf31e Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Sun, 22 May 2011 18:26:48 +0000 Subject: [PATCH] add some random notes. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131862 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Transforms/InstCombine/InstCombineMulDivRem.cpp | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp b/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp index c96741aacd2..98a36545ad7 100644 --- a/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp +++ b/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp @@ -40,6 +40,11 @@ static Value *simplifyValueKnownNonZero(Value *V, InstCombiner &IC) { return IC.Builder->CreateShl(One, A); } + // TODO: Lots more we could do here: + // "1 >> X" could get an "isexact" bit. + // If V is a phi node, we can call this on each of its operands. + // "select cond, X, 0" can simplify to "X". + return 0; } -- 2.34.1