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Mark barrier instructions. Execution does not fall through uncond branches 

or return intructions.

llvm-svn: 15356
This commit is contained in:
Chris Lattner 2004-07-31 02:10:53 +00:00
parent fd4558862c
commit 66a13e230d
1 changed files with 4 additions and 2 deletions
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6
llvm/lib/Target/X86/X86InstrInfo.td
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@ -169,19 +169,21 @@ def IMPLICIT_DEF : I<"IMPLICIT_DEF", 0, Pseudo>;
let isTerminator = 1 in
let Defs = [FP0, FP1, FP2, FP3, FP4, FP5, FP6] in
def FP_REG_KILL : I<"FP_REG_KILL", 0, Pseudo>;
//===----------------------------------------------------------------------===//
// Control Flow Instructions...
//
// Return instruction...
let isTerminator = 1, isReturn = 1 in
let isTerminator = 1, isReturn = 1, isBarrier = 1 in
def RET : I<"ret", 0xC3, RawFrm>, Pattern<(retvoid)>;
// All branches are RawFrm, Void, Branch, and Terminators
let isBranch = 1, isTerminator = 1 in
class IBr<string name, bits<8> opcode> : I<name, opcode, RawFrm>;
def JMP : IBr<"jmp", 0xE9>, Pattern<(br basicblock)>;
let isBarrier = 1 in
def JMP : IBr<"jmp", 0xE9>, Pattern<(br basicblock)>;
def JB : IBr<"jb" , 0x82>, TB;
def JAE : IBr<"jae", 0x83>, TB;
def JE : IBr<"je" , 0x84>, TB, Pattern<(isVoid (unspec1 basicblock))>;