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Do not model all INLINEASM instructions as having unmodelled side effects.

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Instead encode llvm IR level property "HasSideEffects" in an operand (shared
with IsAlignStack). Added MachineInstrs::hasUnmodeledSideEffects() to check
the operand when the instruction is an INLINEASM.

This allows memory instructions to be moved around INLINEASM instructions.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123044 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2011-01-07 23:50:32 +00:00
parent 067a16c974
commit c36b7069b4
21 changed files with 129 additions and 46 deletions
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6
lib/CodeGen/DeadMachineInstructionElim.cpp
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@@ -54,6 +54,12 @@ FunctionPass *llvm::createDeadMachineInstructionElimPass() {
}
bool DeadMachineInstructionElim::isDead(const MachineInstr *MI) const {
// Technically speaking inline asm without side effects and no defs can still
// be deleted. But there is so much bad inline asm code out there, we should
// let them be.
if (MI->isInlineAsm())
return false;
// Don't delete instructions with side effects.
bool SawStore = false;
if (!MI->isSafeToMove(TII, 0, SawStore) && !MI->isPHI())