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Implement the optimized FCMP_OEQ/FCMP_UNE code for x86 fast-isel.

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llvm-svn: 57915
This commit is contained in:
Dan Gohman 2008-10-21 18:24:51 +00:00
parent 19a669f11a
commit 34306e122d
1 changed files with 12 additions and 0 deletions
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12
lib/Target/X86/X86FastISel.cpp
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@ -692,6 +692,11 @@ bool X86FastISel::X86SelectBranch(Instruction *I) {
unsigned BranchOpc; // Opcode to jump on, e.g. "X86::JA"
switch (Predicate) {
case CmpInst::FCMP_OEQ:
std::swap(TrueMBB, FalseMBB);
Predicate = CmpInst::FCMP_UNE;
// FALL THROUGH
case CmpInst::FCMP_UNE: SwapArgs = false; BranchOpc = X86::JNE; break;
case CmpInst::FCMP_OGT: SwapArgs = false; BranchOpc = X86::JA; break;
case CmpInst::FCMP_OGE: SwapArgs = false; BranchOpc = X86::JAE; break;
case CmpInst::FCMP_OLT: SwapArgs = true; BranchOpc = X86::JA; break;
@ -728,6 +733,13 @@ bool X86FastISel::X86SelectBranch(Instruction *I) {
return false;
BuildMI(MBB, TII.get(BranchOpc)).addMBB(TrueMBB);
if (Predicate == CmpInst::FCMP_UNE) {
// X86 requires a second branch to handle UNE (and OEQ,
// which is mapped to UNE above).
BuildMI(MBB, TII.get(X86::JP)).addMBB(TrueMBB);
}
FastEmitBranch(FalseMBB);
MBB->addSuccessor(TrueMBB);
return true;