6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-03-27 14:32:21 +00:00
Code Issues Projects Releases Wiki Activity

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

Browse Source 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57915 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2008-10-21 18:24:51 +00:00
parent 237033e6ac
commit 7b66e04182
1 changed files with 12 additions and 0 deletions

12
lib/Target/X86/X86FastISel.cpp

@ -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;