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| author | Mon P Wang <wangmp@apple.com> | 2010-11-19 19:08:12 +0000 |
|---|---|---|
| committer | Mon P Wang <wangmp@apple.com> | 2010-11-19 19:08:12 +0000 |
| commit | cab98e3168558a40675a06bc830eb87b8e40070e (patch) | |
| tree | b0a9820c8c15ed1ac1de6cdf0fb524e3b8a28aa7 | |
| parent | 805f105da0e15c3c63c5d5e9df0140d3421b4a55 (diff) | |
| download | llvm-cab98e3168558a40675a06bc830eb87b8e40070e.tar.gz llvm-cab98e3168558a40675a06bc830eb87b8e40070e.tar.bz2 llvm-cab98e3168558a40675a06bc830eb87b8e40070e.tar.xz | |
Make isScalarToVector to return false if the node is a scalar. This will prevent
DAGCombine from making an illegal transformation of bitcast of a scalar to a
vector into a scalar_to_vector.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119819 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/CodeGen/SelectionDAG/SelectionDAG.cpp | 2 | ||||
| -rw-r--r-- | test/CodeGen/X86/bc-extract.ll | 27 |
2 files changed, 29 insertions, 0 deletions
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp index 08ef505bab..82a1746bb3 100644 --- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp +++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp @@ -199,6 +199,8 @@ bool ISD::isScalarToVector(const SDNode *N) { if (N->getOperand(0).getOpcode() == ISD::UNDEF) return false; unsigned NumElems = N->getNumOperands(); + if (NumElems == 1) + return false; for (unsigned i = 1; i < NumElems; ++i) { SDValue V = N->getOperand(i); if (V.getOpcode() != ISD::UNDEF) diff --git a/test/CodeGen/X86/bc-extract.ll b/test/CodeGen/X86/bc-extract.ll new file mode 100644 index 0000000000..6e8063ad7c --- /dev/null +++ b/test/CodeGen/X86/bc-extract.ll @@ -0,0 +1,27 @@ +; RUN: llc < %s -march=x86-64 -mattr=+sse42 -disable-mmx | FileCheck %s + + +define float @extractFloat1() nounwind { +entry: + ; CHECK: 1065353216 + %tmp0 = bitcast <1 x double> <double 0x000000003F800000> to <2 x float> + %tmp1 = extractelement <2 x float> %tmp0, i32 0 + ret float %tmp1 +} + +define float @extractFloat2() nounwind { +entry: + ; CHECK: pxor %xmm0, %xmm0 + %tmp4 = bitcast <1 x double> <double 0x000000003F800000> to <2 x float> + %tmp5 = extractelement <2 x float> %tmp4, i32 1 + ret float %tmp5 +} + +define i32 @extractInt2() nounwind { +entry: + ; CHECK: xorl %eax, %eax + %tmp4 = bitcast <1 x i64> <i64 256> to <2 x i32> + %tmp5 = extractelement <2 x i32> %tmp4, i32 1 + ret i32 %tmp5 +} + |