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[x86] Add JMP_2 and other 16-bit PC-relative branch instructions

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Mark them as requiring 16-bit mode for now, since we don't yet have
relaxation support for FK_Data_2.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198762 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Woodhouse 2014-01-08 12:58:36 +00:00
parent 2634d1f6da
commit 51a64502bf
1 changed files with 6 additions and 0 deletions
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6
lib/Target/X86/X86InstrControl.td
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@ -52,6 +52,9 @@ let isTerminator = 1, isReturn = 1, isBarrier = 1,
let isBarrier = 1, isBranch = 1, isTerminator = 1, SchedRW = [WriteJump] in {
def JMP_4 : Ii32PCRel<0xE9, RawFrm, (outs), (ins brtarget:$dst),
"jmp\t$dst", [(br bb:$dst)], IIC_JMP_REL>, OpSize16;
def JMP_2 : Ii16PCRel<0xE9, RawFrm, (outs), (ins brtarget:$dst),
"jmp\t$dst", [(br bb:$dst)], IIC_JMP_REL>, OpSize,
Requires<[In16BitMode]>;
let hasSideEffects = 0 in
def JMP_1 : Ii8PCRel<0xEB, RawFrm, (outs), (ins brtarget8:$dst),
"jmp\t$dst", [], IIC_JMP_REL>;
@ -63,6 +66,9 @@ let isBranch = 1, isTerminator = 1, Uses = [EFLAGS], SchedRW = [WriteJump] in {
let hasSideEffects = 0 in
def _1 : Ii8PCRel <opc1, RawFrm, (outs), (ins brtarget8:$dst), asm, [],
IIC_Jcc>;
def _2 : Ii16PCRel<opc4, RawFrm, (outs), (ins brtarget:$dst), asm,
[(X86brcond bb:$dst, Cond, EFLAGS)], IIC_Jcc>, OpSize,
TB, Requires<[In16BitMode]>;
def _4 : Ii32PCRel<opc4, RawFrm, (outs), (ins brtarget:$dst), asm,
[(X86brcond bb:$dst, Cond, EFLAGS)], IIC_Jcc>, TB,
OpSize16;