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[PowerPC] Support time base instructions 

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.

llvm-svn: 185829
This commit is contained in:
Ulrich Weigand 2013-07-08 15:20:38 +00:00
parent 6a09df7964
commit e840ee2ca2
2 changed files with 15 additions and 0 deletions
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6
llvm/lib/Target/PowerPC/PPCInstrInfo.td
View File

@ -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)>;

9
llvm/test/MC/PowerPC/ppc64-encoding-bookII.s
View File

@ -71,3 +71,12 @@
# CHECK: wait 2 # encoding: [0x7c,0x40,0x00,0x7c]
waitimpl
# Time base instructions
# CHECK: mftb 2, 123 # encoding: [0x7c,0x5b,0x1a,0xe6]
mftb 2, 123
# CHECK: mftb 2, 268 # encoding: [0x7c,0x4c,0x42,0xe6]
mftb 2
# CHECK: mftb 2, 269 # encoding: [0x7c,0x4d,0x42,0xe6]
mftbu 2