From d53886bb488fbef11b8083d7e99bcf53a51861a0 Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Wed, 15 Oct 2008 05:18:04 +0000 Subject: [PATCH] fold compare of null pointer into compare with 0. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57553 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Target/X86/X86FastISel.cpp | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/lib/Target/X86/X86FastISel.cpp b/lib/Target/X86/X86FastISel.cpp index 954a3a0640e..e04e91a7acd 100644 --- a/lib/Target/X86/X86FastISel.cpp +++ b/lib/Target/X86/X86FastISel.cpp @@ -549,6 +549,10 @@ bool X86FastISel::X86FastEmitCompare(Value *Op0, Value *Op1, MVT VT) { unsigned Op0Reg = getRegForValue(Op0); if (Op0Reg == 0) return false; + // Handle 'null' like i32/i64 0. + if (isa(Op1)) + Op1 = Constant::getNullValue(TD.getIntPtrType()); + // We have two options: compare with register or immediate. If the RHS of // the compare is an immediate that we can fold into this compare, use // CMPri, otherwise use CMPrr.