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| author | Nadav Rotem <nadav.rotem@intel.com> | 2012-07-16 18:34:53 +0000 |
|---|---|---|
| committer | Nadav Rotem <nadav.rotem@intel.com> | 2012-07-16 18:34:53 +0000 |
| commit | 7ee0e5ae6093dba18ecc5eaafb91e8fa82f4c409 (patch) | |
| tree | a0ea68dae4d656b5bdb1b54ffff831937a155665 | |
| parent | b1162b8d4be6680c9f2c9f3124ce279876e2bb15 (diff) | |
| download | external_llvm-7ee0e5ae6093dba18ecc5eaafb91e8fa82f4c409.zip external_llvm-7ee0e5ae6093dba18ecc5eaafb91e8fa82f4c409.tar.gz external_llvm-7ee0e5ae6093dba18ecc5eaafb91e8fa82f4c409.tar.bz2 | |
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 <michael.m.kuperstein@intel.com>
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160305 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/CodeGen/SelectionDAG/SelectionDAG.cpp | 1 | ||||
| -rw-r--r-- | test/CodeGen/X86/2012-07-16-fp2ui-i1.ll | 12 |
2 files changed, 13 insertions, 0 deletions
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp index 3947648..cfe7170 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 0000000..17533a1 --- /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 +} |