diff options
| author | Dan Gohman <gohman@apple.com> | 2009-09-11 00:36:43 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2009-09-11 00:36:43 +0000 |
| commit | 4a215a13c3035a8818254b61267be77def4a2a37 (patch) | |
| tree | 321e7fa0f85a88cba1e3867d55cf61180c1d005c /lib | |
| parent | 5e5abb77fe9eeb92a55f119fdb721bca4508094a (diff) | |
| download | llvm-4a215a13c3035a8818254b61267be77def4a2a37.tar.gz llvm-4a215a13c3035a8818254b61267be77def4a2a37.tar.bz2 llvm-4a215a13c3035a8818254b61267be77def4a2a37.tar.xz | |
Make fast-isel try ISD::FNEG before resorting to bitcasts and xors.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81493 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/FastISel.cpp | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/lib/CodeGen/SelectionDAG/FastISel.cpp b/lib/CodeGen/SelectionDAG/FastISel.cpp index 15c2140b86..54544a4d14 100644 --- a/lib/CodeGen/SelectionDAG/FastISel.cpp +++ b/lib/CodeGen/SelectionDAG/FastISel.cpp @@ -615,9 +615,17 @@ FastISel::SelectFNeg(User *I) { unsigned OpReg = getRegForValue(BinaryOperator::getFNegArgument(I)); if (OpReg == 0) return false; + // If the target has ISD::FNEG, use it. + EVT VT = TLI.getValueType(I->getType()); + unsigned ResultReg = FastEmit_r(VT.getSimpleVT(), VT.getSimpleVT(), + ISD::FNEG, OpReg); + if (ResultReg != 0) { + UpdateValueMap(I, ResultReg); + return true; + } + // Bitcast the value to integer, twiddle the sign bit with xor, // and then bitcast it back to floating-point. - EVT VT = TLI.getValueType(I->getType()); if (VT.getSizeInBits() > 64) return false; EVT IntVT = EVT::getIntegerVT(I->getContext(), VT.getSizeInBits()); if (!TLI.isTypeLegal(IntVT)) |