[PowerPC] Support basic compare mnemonics

This adds support for the basic mnemoics (with the L operand) for the
fixed-point compare instructions.  These are defined as aliases for the
already existing CMPW/CMPD patterns, depending on the value of L.

This requires use of InstAlias patterns with immediate literal operands.
To make this work, we need two further changes:

 - define a RegisterPrefix, because otherwise literals 0 and 1 would
   be parsed as literal register names

 - provide a PPCAsmParser::validateTargetOperandClass routine to
   recognize immediate literals (like ARM does)

llvm-svn: 185826

1 files changed, 19 insertions, 1 deletions

diff --git a/llvm/test/MC/PowerPC/ppc64-encoding.s b/llvm/test/MC/PowerPC/ppc64-encoding.s
index eac039a61bd..d82d86fd010 100644
--- a/llvm/test/MC/PowerPC/ppc64-encoding.s
+++ b/llvm/test/MC/PowerPC/ppc64-encoding.s
@@ -344,7 +344,25 @@
 # FIXME: divdeuo 2, 3, 4
 # FIXME: divdeuo. 2, 3, 4
 
-# FIXME: Fixed-point compare instructions
+# Fixed-point compare instructions
+
+# CHECK: cmpdi 2, 3, 128                 # encoding: [0x2d,0x23,0x00,0x80]
+         cmpi 2, 1, 3, 128
+# CHECK: cmpd 2, 3, 4                    # encoding: [0x7d,0x23,0x20,0x00]
+         cmp 2, 1, 3, 4
+# CHECK: cmpldi 2, 3, 128                # encoding: [0x29,0x23,0x00,0x80]
+         cmpli 2, 1, 3, 128
+# CHECK: cmpld 2, 3, 4                   # encoding: [0x7d,0x23,0x20,0x40]
+         cmpl 2, 1, 3, 4
+
+# CHECK: cmpwi 2, 3, 128                 # encoding: [0x2d,0x03,0x00,0x80]
+         cmpi 2, 0, 3, 128
+# CHECK: cmpw 2, 3, 4                    # encoding: [0x7d,0x03,0x20,0x00]
+         cmp 2, 0, 3, 4
+# CHECK: cmplwi 2, 3, 128                # encoding: [0x29,0x03,0x00,0x80]
+         cmpli 2, 0, 3, 128
+# CHECK: cmplw 2, 3, 4                   # encoding: [0x7d,0x03,0x20,0x40]
+         cmpl 2, 0, 3, 4
 
 # Fixed-point trap instructions