--- /dev/null
+// Validate that we can assemble this file exactly like the platform
+// assembler.
+//
+// RUN: llvm-mc -filetype=obj -triple i386-apple-darwin10 -o %t.mc.o %s
+// RUN: as -arch i386 -o %t.as.o %s
+// RUN: diff %t.mc.o %t.as.o
+
+# 1 byte nop test
+ .align 4, 0 # start with 16 byte alignment filled with zeros
+ ret
+ # nop
+ # 0x90
+ .align 1, 0x90
+ ret
+# 2 byte nop test
+ .align 4, 0 # start with 16 byte alignment filled with zeros
+ ret
+ ret
+ # xchg %ax,%ax
+ # 0x66, 0x90
+ .align 2, 0x90
+ ret
+# 3 byte nop test
+ .align 4, 0 # start with 16 byte alignment filled with zeros
+ ret
+ # nopl (%[re]ax)
+ # 0x0f, 0x1f, 0x00
+ .align 2, 0x90
+ ret
+# 4 byte nop test
+ .align 4, 0 # start with 16 byte alignment filled with zeros
+ ret
+ ret
+ ret
+ ret
+ # nopl 0(%[re]ax)
+ # 0x0f, 0x1f, 0x40, 0x00
+ .align 3, 0x90
+ ret
+# 5 byte nop test
+ .align 4, 0 # start with 16 byte alignment filled with zeros
+ ret
+ ret
+ ret
+ # nopl 0(%[re]ax,%[re]ax,1)
+ # 0x0f, 0x1f, 0x44, 0x00, 0x00
+ .align 3, 0x90
+ ret
+# 6 byte nop test
+ .align 4, 0 # start with 16 byte alignment filled with zeros
+ ret
+ ret
+ # nopw 0(%[re]ax,%[re]ax,1)
+ # 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00
+ .align 3, 0x90
+ ret
+# 7 byte nop test
+ .align 4, 0 # start with 16 byte alignment filled with zeros
+ ret
+ # nopl 0L(%[re]ax)
+ # 0x0f, 0x1f, 0x80, 0x00, 0x00, 0x00, 0x00
+ .align 3, 0x90
+ ret
+# 8 byte nop test
+ .align 4, 0 # start with 16 byte alignment filled with zeros
+ ret
+ ret
+ ret
+ ret
+ ret
+ ret
+ ret
+ ret
+ # nopl 0L(%[re]ax,%[re]ax,1)
+ # 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00
+ .align 3, 0x90
+ ret
+# 9 byte nop test
+ .align 4, 0 # start with 16 byte alignment filled with zeros
+ ret
+ ret
+ ret
+ ret
+ ret
+ ret
+ ret
+ # nopw 0L(%[re]ax,%[re]ax,1)
+ # 0x66, 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00
+ .align 4, 0x90
+ ret
+# 10 byte nop test
+ .align 4, 0 # start with 16 byte alignment filled with zeros
+ ret
+ ret
+ ret
+ ret
+ ret
+ ret
+ ret
+ # nopw %cs:0L(%[re]ax,%[re]ax,1)
+ # 0x66, 0x2e, 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00
+ .align 4, 0x90
+ ret
+# 11 byte nop test
+ .align 4, 0 # start with 16 byte alignment filled with zeros
+ ret
+ ret
+ ret
+ ret
+ ret
+ # nopw %cs:0L(%[re]ax,%[re]ax,1)
+ # 0x66, 0x2e, 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00
+ .align 4, 0x90
+ ret
+# 12 byte nop test
+ .align 4, 0 # start with 16 byte alignment filled with zeros
+ ret
+ ret
+ ret
+ ret
+ # nopw 0(%[re]ax,%[re]ax,1)
+ # nopw 0(%[re]ax,%[re]ax,1)
+ # 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00,
+ # 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00
+ .align 4, 0x90
+ ret
+# 13 byte nop test
+ .align 4, 0 # start with 16 byte alignment filled with zeros
+ ret
+ ret
+ ret
+ # nopw 0(%[re]ax,%[re]ax,1)
+ # nopl 0L(%[re]ax)
+ # 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00,
+ # 0x0f, 0x1f, 0x80, 0x00, 0x00, 0x00, 0x00
+ .align 4, 0x90
+ ret
+# 14 byte nop test
+ .align 4, 0 # start with 16 byte alignment filled with zeros
+ ret
+ ret
+ # nopl 0L(%[re]ax)
+ # nopl 0L(%[re]ax)
+ # 0x0f, 0x1f, 0x80, 0x00, 0x00, 0x00, 0x00,
+ # 0x0f, 0x1f, 0x80, 0x00, 0x00, 0x00, 0x00
+ .align 4, 0x90
+ ret
+# 15 byte nop test
+ .align 4, 0 # start with 16 byte alignment filled with zeros
+ ret
+ # nopl 0L(%[re]ax)
+ # nopl 0L(%[re]ax,%[re]ax,1)
+ # 0x0f, 0x1f, 0x80, 0x00, 0x00, 0x00, 0x00,
+ # 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00
+ .align 4, 0x90
+ ret