[llvm] r228719 - [PowerPC] Support the (old) cntlz instruction alias

[Hal Finkel]

Author: hfinkel
Date: Tue Feb 10 12:45:02 2015
New Revision: 228719

URL: http://llvm.org/viewvc/llvm-project?rev=228719&view=rev
Log:
[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.

Modified:
    llvm/trunk/lib/Target/PowerPC/PPCInstrInfo.td
    llvm/trunk/test/MC/PowerPC/ppc64-encoding.s

Modified: llvm/trunk/lib/Target/PowerPC/PPCInstrInfo.td
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/PowerPC/PPCInstrInfo.td?rev=228719&r1=228718&r2=228719&view=diff
==============================================================================
--- llvm/trunk/lib/Target/PowerPC/PPCInstrInfo.td (original)
+++ llvm/trunk/lib/Target/PowerPC/PPCInstrInfo.td Tue Feb 10 12:45:02 2015
@@ -3566,6 +3566,9 @@ def : InstAlias<"rotlw. $rA, $rS, $rB",
 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",

Modified: llvm/trunk/test/MC/PowerPC/ppc64-encoding.s
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/MC/PowerPC/ppc64-encoding.s?rev=228719&r1=228718&r2=228719&view=diff
==============================================================================
--- llvm/trunk/test/MC/PowerPC/ppc64-encoding.s (original)
+++ llvm/trunk/test/MC/PowerPC/ppc64-encoding.s Tue Feb 10 12:45:02 2015
@@ -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]