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Allow the FP stackifier to completely ignore functions that do not use FP at

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all.  This should speed up the X86 backend fairly significantly on integer
codes.  Now if only we didn't have to compute livevar still... ;-)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19796 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-01-23 23:13:59 +00:00
parent 3563015b0d
commit 42e25b387f
1 changed files with 15 additions and 0 deletions
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15
lib/Target/X86/X86FloatingPoint.cpp
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@ -157,6 +157,21 @@ FunctionPass *llvm::createX86FloatingPointStackifierPass() { return new FPS(); }
/// register references into FP stack references.
///
bool FPS::runOnMachineFunction(MachineFunction &MF) {
// We only need to run this pass if there are any FP registers used in this
// function. If it is all integer, there is nothing for us to do!
const bool *PhysRegsUsed = MF.getUsedPhysregs();
bool FPIsUsed = false;
assert(X86::FP6 == X86::FP0+6 && "Register enums aren't sorted right!");
for (unsigned i = 0; i <= 6; ++i)
if (PhysRegsUsed[X86::FP0+i]) {
FPIsUsed = true;
break;
}
// Early exit.
if (!FPIsUsed) return false;
LV = &getAnalysis<LiveVariables>();
StackTop = 0;