--- /dev/null
+; RUN: llc < %s -mtriple=x86_64-unknown-freebsd8.1 -o /dev/null
+; This formerly crashed, PR 8154.
+
+module asm ".weak sem_close"
+module asm ".equ sem_close, _sem_close"
+module asm ".weak sem_destroy"
+module asm ".equ sem_destroy, _sem_destroy"
+module asm ".weak sem_getvalue"
+module asm ".equ sem_getvalue, _sem_getvalue"
+module asm ".weak sem_init"
+module asm ".equ sem_init, _sem_init"
+module asm ".weak sem_open"
+module asm ".equ sem_open, _sem_open"
+module asm ".weak sem_post"
+module asm ".equ sem_post, _sem_post"
+module asm ".weak sem_timedwait"
+module asm ".equ sem_timedwait, _sem_timedwait"
+module asm ".weak sem_trywait"
+module asm ".equ sem_trywait, _sem_trywait"
+module asm ".weak sem_unlink"
+module asm ".equ sem_unlink, _sem_unlink"
+module asm ".weak sem_wait"
+module asm ".equ sem_wait, _sem_wait"
+
+%struct._sem = type { i32, %struct._usem }
+%struct._usem = type { i32, i32, i32 }
+
+define void @_sem_timedwait(%struct._sem* noalias %sem) nounwind ssp {
+entry:
+ br i1 undef, label %while.cond.preheader, label %sem_check_validity.exit
+
+while.cond.preheader: ; preds = %entry
+ %tmp4 = getelementptr inbounds %struct._sem* %sem, i64 0, i32 1, i32 1
+ br label %while.cond
+
+sem_check_validity.exit: ; preds = %entry
+ ret void
+
+while.cond: ; preds = %while.body, %while.cond.preheader
+ br i1 undef, label %while.body, label %while.end
+
+while.body: ; preds = %while.cond
+ %0 = call i8 asm sideeffect "\09lock ; \09\09\09cmpxchgl $2,$1 ;\09 sete\09$0 ;\09\091:\09\09\09\09# atomic_cmpset_int", "={ax},=*m,r,{ax},*m,~{memory},~{dirflag},~{fpsr},~{flags}"(i32* %tmp4, i32 undef, i32 undef, i32* %tmp4) nounwind, !srcloc !0
+ br i1 undef, label %while.cond, label %return
+
+while.end: ; preds = %while.cond
+ br i1 undef, label %if.end18, label %return
+
+if.end18: ; preds = %while.end
+ unreachable
+
+return: ; preds = %while.end, %while.body
+ ret void
+}
+
+!0 = metadata !{i32 158484}