diff options
| 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 | 9f8fd6d9ea4ae50587cd1c1f088e24dea37e9ca7 (patch) | |
| tree | 67fb8b6100b734834be33317edd28a6e9c1a520d /lib/Target/X86/InstSelectSimple.cpp | |
| parent | 4a06f354843117df344d7b0aacc7114d50d38fe9 (diff) | |
Generate the fchs instruction to negate a floating point number
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11078 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/X86/InstSelectSimple.cpp')
| -rw-r--r-- | lib/Target/X86/InstSelectSimple.cpp | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/lib/Target/X86/InstSelectSimple.cpp b/lib/Target/X86/InstSelectSimple.cpp index fd4c44f99e..abfcad1566 100644 --- a/lib/Target/X86/InstSelectSimple.cpp +++ b/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] = { |