diff --git a/power_fv/check/insn/compare.py b/power_fv/check/insn/compare.py
index 142af87..e50837e 100644
--- a/power_fv/check/insn/compare.py
+++ b/power_fv/check/insn/compare.py
@@ -4,11 +4,13 @@ from power_fv.check.insn import InsnCheck
 
 
 __all__ = [
-    "CMPI", "CMPLI", "CMP", "CMPL",
+    "CMPI", "CMPLI", "CMP", "CMPL", "CMPRB", "CMPEQB",
 ]
 
 
-class CMPI  (InsnCheck, spec_cls=CompareSpec, insn_cls=const.CMPI ): pass
-class CMPLI (InsnCheck, spec_cls=CompareSpec, insn_cls=const.CMPLI): pass
-class CMP   (InsnCheck, spec_cls=CompareSpec, insn_cls=const.CMP  ): pass
-class CMPL  (InsnCheck, spec_cls=CompareSpec, insn_cls=const.CMPL ): pass
+class CMPI   (InsnCheck, spec_cls=CompareSpec, insn_cls=const.CMPI  ): pass
+class CMPLI  (InsnCheck, spec_cls=CompareSpec, insn_cls=const.CMPLI ): pass
+class CMP    (InsnCheck, spec_cls=CompareSpec, insn_cls=const.CMP   ): pass
+class CMPL   (InsnCheck, spec_cls=CompareSpec, insn_cls=const.CMPL  ): pass
+class CMPRB  (InsnCheck, spec_cls=CompareSpec, insn_cls=const.CMPRB ): pass
+class CMPEQB (InsnCheck, spec_cls=CompareSpec, insn_cls=const.CMPEQB): pass
diff --git a/power_fv/insn/spec/compare.py b/power_fv/insn/spec/compare.py
index 29d6d6e..afc0b21 100644
--- a/power_fv/insn/spec/compare.py
+++ b/power_fv/insn/spec/compare.py
@@ -32,7 +32,7 @@ class CompareSpec(InsnSpec, Elaboratable):
             ("so",  1),
         ])
 
-        # Operand A : (RA) or [(RA)(32:63) sign-extended or zero-extended]
+        # Operand A : (RA) or EXTS((RA)(32:63)) or EXTZ((RA)(32:63)) or EXTZ((RA)(56:63))
 
         m.d.comb += [
             self.pfv.ra.index.eq(self.insn.RA),
@@ -49,12 +49,14 @@ class CompareSpec(InsnSpec, Elaboratable):
                 m.d.comb += src_a.eq(self.pfv.ra.r_data)
             with m.Else():
                 m.d.comb += src_a.eq(self.pfv.ra.r_data[:32].as_unsigned())
+        elif isinstance(self.insn, (CMPRB, CMPEQB)):
+            m.d.comb += src_a.eq(self.pfv.ra.r_data[:8].as_unsigned())
         else:
             assert False
 
-        # Operand B : SI or UI or (RB) or [(RB)(32:63) sign-extended or zero-extended]
+        # Operand B : SI or UI or (RB) or EXTS((RB)(32:63)) or EXTZ((RB)(32:63))
 
-        if isinstance(self.insn, (CMP, CMPL)):
+        if isinstance(self.insn, (CMP, CMPL, CMPRB, CMPEQB)):
             m.d.comb += [
                 self.pfv.rb.index.eq(self.insn.RB),
                 self.pfv.rb.r_stb.eq(1),
@@ -74,27 +76,61 @@ class CompareSpec(InsnSpec, Elaboratable):
                 m.d.comb += src_b.eq(self.pfv.rb.r_data)
             with m.Else():
                 m.d.comb += src_b.eq(self.pfv.rb.r_data[:32].as_unsigned())
+        elif isinstance(self.insn, CMPRB):
+            m.d.comb += src_b.eq(self.pfv.rb.r_data[:32].as_unsigned())
+        elif isinstance(self.insn, CMPEQB):
+            m.d.comb += src_b.eq(self.pfv.rb.r_data)
         else:
             assert False
 
         # Result
 
-        if isinstance(self.insn, (CMPI, CMP)):
-            m.d.comb += result.lt.eq(src_a.as_signed() < src_b.as_signed())
-        elif isinstance(self.insn, (CMPLI, CMPL)):
-            m.d.comb += result.lt.eq(src_a.as_unsigned() < src_b.as_unsigned())
+        if isinstance(self.insn, (CMPI, CMP, CMPLI, CMPL)):
+            if isinstance(self.insn, (CMPI, CMP)):
+                m.d.comb += result.lt.eq(src_a.as_signed() < src_b.as_signed())
+            if isinstance(self.insn, (CMPLI, CMPL)):
+                m.d.comb += result.lt.eq(src_a.as_unsigned() < src_b.as_unsigned())
+
+            m.d.comb += [
+                result.gt .eq(~(result.lt | result.eq_)),
+                result.eq_.eq(src_a == src_b),
+                result.so .eq(self.pfv.xer.r_data.so),
+            ]
+
+        elif isinstance(self.insn, CMPRB):
+            src1     = Signal(unsigned(8))
+            src21hi  = Signal(unsigned(8))
+            src21lo  = Signal(unsigned(8))
+            src22hi  = Signal(unsigned(8))
+            src22lo  = Signal(unsigned(8))
+            in_range = Signal()
+
+            m.d.comb += [
+                src1.eq(src_a[:8]),
+                Cat(src22lo, src22hi, src21lo, src21hi).eq(src_b[:32]),
+            ]
+
+            with m.If(~self.insn.L):
+                m.d.comb += in_range.eq( (src22lo <= src1) & (src1 <= src22hi))
+            with m.Else():
+                m.d.comb += in_range.eq( (src21lo <= src1) & (src1 <= src21hi)
+                                       | (src22lo <= src1) & (src1 <= src22hi))
+
+            m.d.comb += result.eq(Cat(Const(0, 2), in_range, Const(0, 1)))
+
+        elif isinstance(self.insn, CMPEQB):
+            _match = 0
+            for i in range(64//8):
+                _match |= (src_a == src_b.word_select(i, width=8))
+
+            m.d.comb += result.eq(Cat(Const(0, 2), _match, Const(0, 1)))
+
         else:
             assert False
 
         m.d.comb += [
-            result.gt .eq(~(result.lt | result.eq_)),
-            result.eq_.eq(src_a == src_b),
-            result.so .eq(self.pfv.xer.r_data.so),
-        ]
-
-        m.d.comb += [
-            self.pfv.cr.w_mask[::-1].word_select(self.insn.BF, width=4).eq(0b1111),
-            self.pfv.cr.w_data[::-1].word_select(self.insn.BF, width=4).eq(result),
+            self.pfv.cr.w_mask.word_select(7-self.insn.BF, width=4).eq(0xf),
+            self.pfv.cr.w_data.word_select(7-self.insn.BF, width=4).eq(result),
         ]
 
         return m