diff --git a/llvm/test/MC/Disassembler/X86/invalid-cmp-imm.txt b/llvm/test/MC/Disassembler/X86/invalid-cmp-imm.txt
new file mode 100644
index 000000000000..bf8699b24f26
--- /dev/null
+++ b/llvm/test/MC/Disassembler/X86/invalid-cmp-imm.txt
@@ -0,0 +1,10 @@
+# RUN: llvm-mc --disassemble %s -triple=x86_64-apple-darwin9 |& grep {invalid instruction encoding}
+
+# This instruction would decode as cmpordps if the immediate byte was less than 8.
+0x0f 0xc2 0xc7 0x08
+# This instruction would decode as cmpordpd if the immediate byte was less than 8.
+0x66 0x0f 0xc2 0xc7 0x08
+# This instruction would decode as cmpordss if the immediate byte was less than 8.
+0xf3 0x0f 0xc2 0xc7 0x08
+# This instruction would decode as cmpordsd if the immediate byte was less than 8.
+0xf2 0x0f 0xc2 0xc7 0x08
diff --git a/llvm/test/MC/Disassembler/X86/x86-64.txt b/llvm/test/MC/Disassembler/X86/x86-64.txt
new file mode 100644
index 000000000000..f4b8f46fa2e5
--- /dev/null
+++ b/llvm/test/MC/Disassembler/X86/x86-64.txt
@@ -0,0 +1,63 @@
+# RUN: llvm-mc --disassemble %s -triple=x86_64 | FileCheck %s
+
+# Coverage
+
+# CHECK: vcmptrue_usps 
+0xc5 0x04 0xc2 0xc7 0x1f
+
+# CHECK: vcmptrue_uspd 
+0xc5 0x05 0xc2 0xc7 0x1f
+
+# CHECK: vcmptrue_usss 
+0xc5 0x06 0xc2 0xc7 0x1f
+
+# CHECK: vcmptrue_ussd 
+0xc5 0x07 0xc2 0xc7 0x1f
+
+# CHECK: vcmpeq_uqps 
+0xc5 0x04 0xc2 0xc7 0x08
+
+# CHECK: vcmpeq_uqpd 
+0xc5 0x05 0xc2 0xc7 0x08
+
+# CHECK: vcmpeq_uqss 
+0xc5 0x06 0xc2 0xc7 0x08
+
+# CHECK: vcmpeq_uqsd 
+0xc5 0x07 0xc2 0xc7 0x08
+
+# CHECK: vcmpeqps 
+0xc5 0x04 0xc2 0xc7 0x00
+
+# CHECK: vcmpeqpd 
+0xc5 0x05 0xc2 0xc7 0x00
+
+# CHECK: vcmpeqss 
+0xc5 0x06 0xc2 0xc7 0x00
+
+# CHECK: vcmpeqsd 
+0xc5 0x07 0xc2 0xc7 0x00
+
+# CHECK: cmpeqps 
+0x0f 0xc2 0xc7 0x00
+
+# CHECK: cmpeqpd 
+0x66 0x0f 0xc2 0xc7 0x00
+
+# CHECK: cmpeqss 
+0xf3 0x0f 0xc2 0xc7 0x00
+
+# CHECK: cmpeqsd 
+0xf2 0x0f 0xc2 0xc7 0x00
+
+# CHECK: cmpordps 
+0x0f 0xc2 0xc7 0x07
+
+# CHECK: cmpordpd 
+0x66 0x0f 0xc2 0xc7 0x07
+
+# CHECK: cmpordss 
+0xf3 0x0f 0xc2 0xc7 0x07
+
+# CHECK: cmpordsd 
+0xf2 0x0f 0xc2 0xc7 0x07