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[PowerPC] Support the (old) cntlz instruction alias 

Some old assembly code uses the cntlz alias for cntlzw, binutils supports this,
and we should too. Fixes PR22519.

llvm-svn: 228719
This commit is contained in:
Hal Finkel 2015-02-10 18:45:02 +00:00
parent 6d224dbda7
commit 57c6ac5e41
2 changed files with 9 additions and 0 deletions
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3
llvm/lib/Target/PowerPC/PPCInstrInfo.td
View File

@ -3566,6 +3566,9 @@ def : InstAlias<"rotlw. $rA, $rS, $rB", (RLWNMo gprc:$rA, gprc:$rS, gprc:$rB, 0,
def : InstAlias<"clrlwi $rA, $rS, $n", (RLWINM gprc:$rA, gprc:$rS, 0, u5imm:$n, 31)>;
def : InstAlias<"clrlwi. $rA, $rS, $n", (RLWINMo gprc:$rA, gprc:$rS, 0, u5imm:$n, 31)>;
def : InstAlias<"cntlz $rA, $rS", (CNTLZW gprc:$rA, gprc:$rS)>;
def : InstAlias<"cntlz. $rA, $rS", (CNTLZWo gprc:$rA, gprc:$rS)>;
def EXTLDI : PPCAsmPseudo<"extldi $rA, $rS, $n, $b",
(ins g8rc:$rA, g8rc:$rS, u6imm:$n, u6imm:$b)>;
def EXTLDIo : PPCAsmPseudo<"extldi. $rA, $rS, $n, $b",

6
llvm/test/MC/PowerPC/ppc64-encoding.s
View File

@ -612,6 +612,12 @@
# CHECK-BE: cntlzw. 2, 3 # encoding: [0x7c,0x62,0x00,0x35]
# CHECK-LE: cntlzw. 2, 3 # encoding: [0x35,0x00,0x62,0x7c]
cntlzw. 2, 3
# CHECK-BE: cntlzw 2, 3 # encoding: [0x7c,0x62,0x00,0x34]
# CHECK-LE: cntlzw 2, 3 # encoding: [0x34,0x00,0x62,0x7c]
cntlz 2, 3
# CHECK-BE: cntlzw. 2, 3 # encoding: [0x7c,0x62,0x00,0x35]
# CHECK-LE: cntlzw. 2, 3 # encoding: [0x35,0x00,0x62,0x7c]
cntlz. 2, 3
cmpb 7, 21, 4
# CHECK-BE: cmpb 7, 21, 4 # encoding: [0x7e,0xa7,0x23,0xf8]
# CHECK-LE: cmpb 7, 21, 4 # encoding: [0xf8,0x23,0xa7,0x7e]