amd64: Mark 'jmp' as 'simple_jump'.

Now the block scheduler can remove many empty blocks.

NEWS.md

@@ -42,6 +42,7 @@ libFirm 1.22.1 (2016-01-07)
 * amd64, arm: Avoid redundant sign/zero extension right before a store
 * amd64: Avoid redundant sign/zero extension for truncation
 * amd64: Mark floating point constants as candidates for rematerialization
+* amd64: Improve block schedule by removing empty basic blocks
 * Bugfixes
 
 libFirm 1.22.0 (2015-12-31)

ir/be/amd64/amd64_spec.pl

@@ -458,11 +458,12 @@ ijmp => {
 },
 
 jmp => {
-	state    => "pinned",
-	op_flags => [ "cfopcode" ],
-	out_reqs => [ "exec" ],
-	fixed    => "amd64_op_mode_t op_mode = AMD64_OP_NONE;\n"
-	           ."x86_insn_size_t size    = X86_SIZE_64;\n",
+	state     => "pinned",
+	irn_flags => [ "simple_jump" ],
+	op_flags  => [ "cfopcode" ],
+	out_reqs  => [ "exec" ],
+	fixed     => "amd64_op_mode_t op_mode = AMD64_OP_NONE;\n"
+	            ."x86_insn_size_t size    = X86_SIZE_64;\n",
 },
 
 cmp => {