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Reapply bottom-up fast-isel, with several fixes for x86-32:

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- Check getBytesToPopOnReturn().
 - Eschew ST0 and ST1 for return values.
 - Fix the PIC base register initialization so that it doesn't ever
   fail to end up the top of the entry block.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108039 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2010-07-10 09:00:22 +00:00
parent d737fcafc4
commit 84023e0fbe
26 changed files with 775 additions and 391 deletions
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20
lib/CodeGen/LLVMTargetMachine.cpp
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@@ -329,19 +329,15 @@ bool LLVMTargetMachine::addCommonCodeGenPasses(PassManagerBase &PM,
if (OptLevel != CodeGenOpt::None)
PM.add(createOptimizePHIsPass());
// Delete dead machine instructions regardless of optimization level.
//
// At -O0, fast-isel frequently creates dead instructions.
//
// With optimization, dead code should already be eliminated. However
// there is one known exception: lowered code for arguments that are only
// used by tail calls, where the tail calls reuse the incoming stack
// arguments directly (see t11 in test/CodeGen/X86/sibcall.ll).
PM.add(createDeadMachineInstructionElimPass());
printAndVerify(PM, "After codegen DCE pass",
/* allowDoubleDefs= */ true);
if (OptLevel != CodeGenOpt::None) {
// With optimization, dead code should already be eliminated. However
// there is one known exception: lowered code for arguments that are only
// used by tail calls, where the tail calls reuse the incoming stack
// arguments directly (see t11 in test/CodeGen/X86/sibcall.ll).
PM.add(createDeadMachineInstructionElimPass());
printAndVerify(PM, "After codegen DCE pass",
/* allowDoubleDefs= */ true);
PM.add(createOptimizeExtsPass());
if (!DisableMachineLICM)
PM.add(createMachineLICMPass());