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| author | Chris Lattner <sabre@nondot.org> | 2004-02-02 19:31:38 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2004-02-02 19:31:38 +0000 |
| commit | 30d26ac56127770f0b65917575c431a7e773b846 (patch) | |
| tree | c2ea0d2f1524c22724240e790f6329c9e8a35e26 /llvm/lib/Target/X86/InstSelectSimple.cpp | |
| parent | 7af8ad64441ea1d33f4301e2fa85d83202085a69 (diff) | |
| download | bcm5719-llvm-30d26ac56127770f0b65917575c431a7e773b846.tar.gz bcm5719-llvm-30d26ac56127770f0b65917575c431a7e773b846.zip | |
Generate the fchs instruction to negate a floating point number
llvm-svn: 11078
Diffstat (limited to 'llvm/lib/Target/X86/InstSelectSimple.cpp')
| -rw-r--r-- | llvm/lib/Target/X86/InstSelectSimple.cpp | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/llvm/lib/Target/X86/InstSelectSimple.cpp b/llvm/lib/Target/X86/InstSelectSimple.cpp index fd4c44f99e0..abfcad15668 100644 --- a/llvm/lib/Target/X86/InstSelectSimple.cpp +++ b/llvm/lib/Target/X86/InstSelectSimple.cpp @@ -1227,7 +1227,13 @@ void ISel::emitSimpleBinaryOperation(MachineBasicBlock *MBB, return; } } - } + } else if (ConstantFP *CFP = dyn_cast<ConstantFP>(Op0)) + if (CFP->isExactlyValue(-0.0)) { + // -0.0 - X === -X + unsigned op1Reg = getReg(Op1, MBB, IP); + BMI(MBB, IP, X86::FCHS, 1, DestReg).addReg(op1Reg); + return; + } if (!isa<ConstantInt>(Op1) || Class == cLong) { static const unsigned OpcodeTab[][4] = { |
