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Clean up ARM tail calls a bit. They're pseudo-instructions for normal branches.

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Also more cleanly separate the ARM vs. Thumb functionality. Previously, the
encoding would be incorrect for some Thumb instructions (the indirect calls).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127637 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Grosbach
2011-03-15 00:30:40 +00:00
parent b9b80c3268
commit 5edf24efac
4 changed files with 72 additions and 32 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/Target/ARM/ARMFrameLowering.cpp
+6 -4
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@@ -400,8 +400,8 @@ void ARMFrameLowering::emitEpilogue(MachineFunction &MF,
// Jump to label or value in register.
if (RetOpcode == ARM::TCRETURNdi || RetOpcode == ARM::TCRETURNdiND) {
unsigned TCOpcode = (RetOpcode == ARM::TCRETURNdi)
? (STI.isThumb() ? ARM::TAILJMPdt : ARM::TAILJMPd)
: (STI.isThumb() ? ARM::TAILJMPdNDt : ARM::TAILJMPdND);
? (STI.isThumb() ? ARM::tTAILJMPd : ARM::TAILJMPd)
: (STI.isThumb() ? ARM::tTAILJMPdND : ARM::TAILJMPdND);
MachineInstrBuilder MIB = BuildMI(MBB, MBBI, dl, TII.get(TCOpcode));
if (JumpTarget.isGlobal())
MIB.addGlobalAddress(JumpTarget.getGlobal(), JumpTarget.getOffset(),
@@ -412,10 +412,12 @@ void ARMFrameLowering::emitEpilogue(MachineFunction &MF,
JumpTarget.getTargetFlags());
}
} else if (RetOpcode == ARM::TCRETURNri) {
BuildMI(MBB, MBBI, dl, TII.get(ARM::TAILJMPr)).
BuildMI(MBB, MBBI, dl,
TII.get(STI.isThumb() ? ARM::tTAILJMPr : ARM::TAILJMPr)).
addReg(JumpTarget.getReg(), RegState::Kill);
} else if (RetOpcode == ARM::TCRETURNriND) {
BuildMI(MBB, MBBI, dl, TII.get(ARM::TAILJMPrND)).
BuildMI(MBB, MBBI, dl,
TII.get(STI.isThumb() ? ARM::tTAILJMPrND : ARM::TAILJMPrND)).
addReg(JumpTarget.getReg(), RegState::Kill);
}