diff options
| author | Chris Lattner <sabre@nondot.org> | 2004-03-31 22:22:36 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2004-03-31 22:22:36 +0000 |
| commit | 68626c2b306c6254011599f0ded25350270190fc (patch) | |
| tree | f9df4684bd74590a37d933eeea5c567bc333d421 /lib/Target/X86/InstSelectSimple.cpp | |
| parent | 08bde1870aede8a3f9eeaf9171960a0fc73f1887 (diff) | |
Generate slightly smaller code, "test R, R" instead of "cmp R, 0"
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12579 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, 3 insertions, 5 deletions
diff --git a/lib/Target/X86/InstSelectSimple.cpp b/lib/Target/X86/InstSelectSimple.cpp index e60aed3c8a..8d1b57d681 100644 --- a/lib/Target/X86/InstSelectSimple.cpp +++ b/lib/Target/X86/InstSelectSimple.cpp @@ -1015,8 +1015,7 @@ void ISel::emitSelectOperation(MachineBasicBlock *MBB, CondReg = X86::BL; } - // FIXME: Should generate a 'tst r, r' - BuildMI(*MBB, IP, X86::CMP8ri, 2).addReg(CondReg).addImm(0); + BuildMI(*MBB, IP, X86::TEST8rr, 2).addReg(CondReg).addReg(CondReg); Opcode = X86::FCMOVE; } break; @@ -1047,8 +1046,7 @@ void ISel::emitSelectOperation(MachineBasicBlock *MBB, } else { // Get the value being branched on, and use it to set the condition codes. unsigned CondReg = getReg(Cond, MBB, IP); - // FIXME: Should generate a 'tst r, r' - BuildMI(*MBB, IP, X86::CMP8ri, 2).addReg(CondReg).addImm(0); + BuildMI(*MBB, IP, X86::TEST8rr, 2).addReg(CondReg).addReg(CondReg); switch (SelectClass) { default: assert(0 && "Unknown value class!"); case cFP: Opcode = X86::FCMOVE; break; @@ -1209,7 +1207,7 @@ void ISel::visitBranchInst(BranchInst &BI) { // Nope, cannot fold setcc into this branch. Emit a branch on a condition // computed some other way... unsigned condReg = getReg(BI.getCondition()); - BuildMI(BB, X86::CMP8ri, 2).addReg(condReg).addImm(0); + BuildMI(BB, X86::TEST8rr, 2).addReg(condReg).addReg(condReg); if (BI.getSuccessor(1) == NextBB) { if (BI.getSuccessor(0) != NextBB) BuildMI(BB, X86::JNE, 1).addPCDisp(BI.getSuccessor(0)); |