From 7ee0e5ae6093dba18ecc5eaafb91e8fa82f4c409 Mon Sep 17 00:00:00 2001 From: Nadav Rotem Date: Mon, 16 Jul 2012 18:34:53 +0000 Subject: [PATCH] Make ComputeDemandedBits return a deterministic result when computing an AssertZext value. In the added testcase the constant 55 was behind an AssertZext of type i1, and ComputeDemandedBits reported that some of the bits were both known to be one and known to be zero. Together with Michael Kuperstein git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160305 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/SelectionDAG/SelectionDAG.cpp | 1 + test/CodeGen/X86/2012-07-16-fp2ui-i1.ll | 12 ++++++++++++ 2 files changed, 13 insertions(+) create mode 100644 test/CodeGen/X86/2012-07-16-fp2ui-i1.ll diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp index 3947648e6a7..cfe71708fe0 100644 --- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp +++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp @@ -1965,6 +1965,7 @@ void SelectionDAG::ComputeMaskedBits(SDValue Op, APInt &KnownZero, APInt InMask = APInt::getLowBitsSet(BitWidth, VT.getSizeInBits()); ComputeMaskedBits(Op.getOperand(0), KnownZero, KnownOne, Depth+1); KnownZero |= (~InMask); + KnownOne &= (~KnownZero); return; } case ISD::FGETSIGN: diff --git a/test/CodeGen/X86/2012-07-16-fp2ui-i1.ll b/test/CodeGen/X86/2012-07-16-fp2ui-i1.ll new file mode 100644 index 00000000000..17533a1e164 --- /dev/null +++ b/test/CodeGen/X86/2012-07-16-fp2ui-i1.ll @@ -0,0 +1,12 @@ +; RUN: llc < %s -march=x86-64 -mcpu=corei7 + +define void @autogen_SD3100() { +BB: + %FC123 = fptoui float 0x40693F5D00000000 to i1 + br i1 %FC123, label %V, label %W + +V: + ret void +W: + ret void +}