[SystemZ] Allow 8-bit operands to RISBG

RISBG has three 8-bit operands (I3, I4 and I5).  I'd originally
restricted all three to 6 bits, since that's the only range we intended
to use at the time.  However, the top bit of I4 acts as a "zero" flag for
RISBG, while the top bit of I3 acts as a "test" flag for RNSBG & co.
This patch therefore allows them to have the full 8-bit range.
I've left the fifth operand as a 6-bit value for now since the
upper 2 bits have no defined meaning.

llvm-svn: 186070

1 files changed, 1 insertions, 2 deletions

diff --git a/llvm/lib/Target/SystemZ/SystemZInstrFormats.td b/llvm/lib/Target/SystemZ/SystemZInstrFormats.td
index fb530cc5332..7300b90c208 100644
--- a/llvm/lib/Target/SystemZ/SystemZInstrFormats.td
+++ b/llvm/lib/Target/SystemZ/SystemZInstrFormats.td
@@ -1020,8 +1020,7 @@ multiclass CmpSwapRSPair<string mnemonic, bits<8> rsOpcode, bits<16> rsyOpcode,
 class RotateSelectRIEf<string mnemonic, bits<16> opcode, RegisterOperand cls1,
                        RegisterOperand cls2>
   : InstRIEf<opcode, (outs cls1:$R1),
-             (ins cls1:$R1src, cls2:$R2,
-                  uimm8zx6:$I3, uimm8zx6:$I4, uimm8zx6:$I5),
+             (ins cls1:$R1src, cls2:$R2, uimm8:$I3, uimm8:$I4, uimm8zx6:$I5),
              mnemonic#"\t$R1, $R2, $I3, $I4, $I5", []> {
   let Constraints = "$R1 = $R1src";
   let DisableEncoding = "$R1src";