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author | Rafael Espindola <rafael.espindola@gmail.com> | 2011-10-26 21:12:27 +0000 |
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committer | Rafael Espindola <rafael.espindola@gmail.com> | 2011-10-26 21:12:27 +0000 |
commit | e840e88239cf92a065cbf5f5b9c7d18bc139c0e1 (patch) | |
tree | 35284b23a73dec41789d4f75e55078bd4a090c70 /lib/Target/X86/X86InstrCompiler.td | |
parent | 75757f9fd13bffc51a6aa30eefe706c4f84d0913 (diff) | |
download | external_llvm-e840e88239cf92a065cbf5f5b9c7d18bc139c0e1.zip external_llvm-e840e88239cf92a065cbf5f5b9c7d18bc139c0e1.tar.gz external_llvm-e840e88239cf92a065cbf5f5b9c7d18bc139c0e1.tar.bz2 |
This commit introduces two fake instructions MORESTACK_RET and
MORESTACK_RET_RESTORE_R10; which are lowered to a RET and a RET
followed by a MOV respectively. Having a fake instruction prevents
the verifier from seeing a MachineBasicBlock end with a
non-terminator (MOV). It also prevents the rather eccentric case of a
MachineBasicBlock ending with RET but having successors nevertheless.
Patch by Sanjoy Das.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@143062 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/X86/X86InstrCompiler.td')
-rw-r--r-- | lib/Target/X86/X86InstrCompiler.td | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/lib/Target/X86/X86InstrCompiler.td b/lib/Target/X86/X86InstrCompiler.td index da28690..5f9bf16 100644 --- a/lib/Target/X86/X86InstrCompiler.td +++ b/lib/Target/X86/X86InstrCompiler.td @@ -150,6 +150,24 @@ def EH_RETURN64 : I<0xC3, RawFrm, (outs), (ins GR64:$addr), } //===----------------------------------------------------------------------===// +// Pseudo instructions used by segmented stacks. +// + +// This is lowered into a RET instruction by MCInstLower. We need +// this so that we don't have to have a MachineBasicBlock which ends +// with a RET and also has successors. +let isPseudo = 1 in { +def MORESTACK_RET: I<0, Pseudo, (outs), (ins), + "", []>; + +// This instruction is lowered to a RET followed by a MOV. The two +// instructions are not generated on a higher level since then the +// verifier sees a MachineBasicBlock ending with a non-terminator. +def MORESTACK_RET_RESTORE_R10 : I<0, Pseudo, (outs), (ins), + "", []>; +} + +//===----------------------------------------------------------------------===// // Alias Instructions //===----------------------------------------------------------------------===// |