diff options
Diffstat (limited to 'llvm/lib/Target/X86/X86InstrCompiler.td')
| -rw-r--r-- | llvm/lib/Target/X86/X86InstrCompiler.td | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/llvm/lib/Target/X86/X86InstrCompiler.td b/llvm/lib/Target/X86/X86InstrCompiler.td index 82885687bb4..0b63f376302 100644 --- a/llvm/lib/Target/X86/X86InstrCompiler.td +++ b/llvm/lib/Target/X86/X86InstrCompiler.td @@ -142,6 +142,15 @@ def WIN_ALLOCA_64 : I<0, Pseudo, (outs), (ins GR64:$size), [(X86WinAlloca GR64:$size)]>, Requires<[In64BitMode]>; +// These instructions XOR the frame pointer into a GPR. They are used in some +// stack protection schemes. These are post-RA pseudos because we only know the +// frame register after register allocation. +let Constraints = "$src = $dst", isPseudo = 1, Defs = [EFLAGS] in { + def XOR32_FP : I<0, Pseudo, (outs GR32:$dst), (ins GR32:$src), + "xorl\t$$FP, $src", []>, Requires<[NotLP64]>; + def XOR64_FP : I<0, Pseudo, (outs GR64:$dst), (ins GR64:$src), + "xorq\t$$FP $src", []>, Requires<[In64BitMode]>; +} //===----------------------------------------------------------------------===// // EH Pseudo Instructions |
