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[PowerPC] Support time base instructions

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This adds support for the old-style time base instructions;
while new programs are supposed to use mfspr, the mftb instructions
are still supported and in use by existing assembler files.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185829 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Ulrich Weigand
2013-07-08 15:20:38 +00:00
parent 9e5bbeab1f
commit 19d2b78978
2 changed files with 15 additions and 0 deletions
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6
lib/Target/PowerPC/PPCInstrInfo.td
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@@ -1853,6 +1853,9 @@ def MFSPR : XFXForm_1<31, 339, (outs gprc:$RT), (ins i32imm:$SPR),
def MTSPR : XFXForm_1<31, 467, (outs), (ins i32imm:$SPR, gprc:$RT),
"mtspr $SPR, $RT", SprMTSPR>;
def MFTB : XFXForm_1<31, 371, (outs gprc:$RT), (ins i32imm:$SPR),
"mftb $RT, $SPR", SprMFTB>;
let Uses = [CTR] in {
def MFCTR : XFXForm_1_ext<31, 339, 9, (outs gprc:$rT), (ins),
"mfctr $rT", SprMFSPR>,
@@ -2335,6 +2338,9 @@ def : InstAlias<"crnot $bx, $by", (CRNOR crbitrc:$bx, crbitrc:$by, crbitrc:$by)>
def : InstAlias<"mtxer $Rx", (MTSPR 1, gprc:$Rx)>;
def : InstAlias<"mfxer $Rx", (MFSPR gprc:$Rx, 1)>;
def : InstAlias<"mftb $Rx", (MFTB gprc:$Rx, 268)>;
def : InstAlias<"mftbu $Rx", (MFTB gprc:$Rx, 269)>;
def : InstAlias<"xnop", (XORI R0, R0, 0)>;
def : InstAlias<"mr $rA, $rB", (OR8 g8rc:$rA, g8rc:$rB, g8rc:$rB)>;