Add support for ARC instruction relaxation in the assembler.

gas/
2016-01-26  Claudiu Zissulescu  <claziss@synopsys.com>
	    Janek van Oirschot <jvanoirs@synopsys.com>

        * config/tc-arc.h (TC_FRAG_TYPE, TC_PCREL_ADJUST, MAX_INSN_ARGS)
        (MAX_INSN_FLGS, MAX_FLAG_NAME_LENGHT, TC_GENERIC_RELAX_TABLE):
        Define.
        (arc_flags, arc_relax_type): New structure.
        * config/tc-arc.c (FRAG_MAX_GROWTH, RELAX_TABLE_ENTRY)
	(RELAX_TABLE_ENTRY_MAX): New define.
        (relaxation_state, md_relax_table, arc_relaxable_insns)
	(arc_num_relaxable_ins): New variable.
	(rlx_operand_type, arc_rlx_types): New enums.
	(arc_relaxable_ins): New structure.
        (OPTION_RELAX): New option.
        (arc_insn): New relax member.
        (arc_flags): Remove.
        (relax_insn_p): New function.
        (apply_fixups): Likewise.
        (relaxable_operand): Likewise.
        (may_relax_expr): Likewise.
        (relaxable_flag): Likewise.
        (arc_pcrel_adjust): Likewise.
        (md_estimate_size_before_relax): Implement.
        (md_convert_frag): Likewise.
        (md_parse_option): Handle new mrelax option.
        (md_show_usage): Likewise.
        (assemble_insn): Set relax member.
        (emit_insn0): New function.
        (emit_insn1): Likewise.
        (emit_insn): Handle relaxation case.
	* NEWS: Mention the new relaxation option.
	* doc/c-arc.texi (ARC Options): Document new mrelax option.

gas/testsuite
2016-01-26  Claudiu Zissulescu  <claziss@synopsys.com>

        * gas/arc/relax-avoid1.d: New file.
        * gas/arc/relax-avoid1.s: Likewise.
        * gas/arc/relax-avoid2.d: Likewise.
        * gas/arc/relax-avoid2.s: Likewise.
        * gas/arc/relax-avoid3.d: Likewise.
        * gas/arc/relax-avoid3.s: Likewise.
	* gas/arc/relax-b.d: Likewise.
        * gas/arc/relax-b.s: Likewise.

include/opcode/
2016-01-26  Claudiu Zissulescu  <claziss@synopsys.com>
	    Janek van Oirschot  <jvanoirs@synopsys.com>

        * arc.h (arc_opcode arc_relax_opcodes, arc_num_relax_opcodes):
        Declare.

opcodes/
2016-01-26  Claudiu Zissulescu  <claziss@synopsys.com>
	    Janek van Oirschot  <jvanoirs@synopsys.com>

        * arc-opc.c (arc_relax_opcodes, arc_num_relax_opcodes): New
        variable.

8 files changed, 91 insertions, 0 deletions

diff --git a/gas/testsuite/gas/arc/relax-avoid1.d b/gas/testsuite/gas/arc/relax-avoid1.d
new file mode 100644
index 0000000..3d6d74e
--- /dev/null
+++ b/gas/testsuite/gas/arc/relax-avoid1.d
@@ -0,0 +1,13 @@
+#as: -mcpu=archs -mrelax
+#objdump: -dr
+
+.*: +file format .*arc.*
+
+
+Disassembly of section .text:
+
+00000000 <.text>:
+   0:	78e0                	nop_s
+   2:	240a 0f80 0000 0000 	mov	r4,0
+			6: R_ARC_32_ME	.LC2
+   a:	78e0                	nop_s
diff --git a/gas/testsuite/gas/arc/relax-avoid1.s b/gas/testsuite/gas/arc/relax-avoid1.s
new file mode 100644
index 0000000..82fbe63
--- /dev/null
+++ b/gas/testsuite/gas/arc/relax-avoid1.s
@@ -0,0 +1,11 @@
+	.section	.rodata
+	.align 4
+.LC2:
+	.word	0x01
+	.word	0x02
+	.word	0x03
+
+	.section	.text
+	.align 4
+	nop_s
+	mov r4,@.LC2
diff --git a/gas/testsuite/gas/arc/relax-avoid2.d b/gas/testsuite/gas/arc/relax-avoid2.d
new file mode 100644
index 0000000..fd602b4
--- /dev/null
+++ b/gas/testsuite/gas/arc/relax-avoid2.d
@@ -0,0 +1,14 @@
+#as: -mcpu=archs -mrelax
+#objdump: -dr
+
+.*: +file format .*arc.*
+
+
+Disassembly of section .text:
+
+00000000 <test>:
+   0:	2000 0000           	add	r0,r0,r0
+
+00000004 <main>:
+   4:	0802 0000           	bl	0 <test>
+			4: R_ARC_S25W_PCREL_PLT	test
diff --git a/gas/testsuite/gas/arc/relax-avoid2.s b/gas/testsuite/gas/arc/relax-avoid2.s
new file mode 100644
index 0000000..703064d
--- /dev/null
+++ b/gas/testsuite/gas/arc/relax-avoid2.s
@@ -0,0 +1,4 @@
+test:
+	add	r0,r0,r0
+main:
+	bl @test@plt
diff --git a/gas/testsuite/gas/arc/relax-avoid3.d b/gas/testsuite/gas/arc/relax-avoid3.d
new file mode 100644
index 0000000..7b177fb
--- /dev/null
+++ b/gas/testsuite/gas/arc/relax-avoid3.d
@@ -0,0 +1,14 @@
+#as: -mcpu=archs -mrelax
+#objdump: -dr
+
+.*: +file format .*arc.*
+
+
+Disassembly of section .text:
+
+00000000 <test>:
+   0:	2000 0000           	add	r0,r0,r0
+
+00000004 <main>:
+   4:	0001 0000           	b	0 <test>
+			4: R_ARC_S25H_PCREL	test
diff --git a/gas/testsuite/gas/arc/relax-avoid3.s b/gas/testsuite/gas/arc/relax-avoid3.s
new file mode 100644
index 0000000..dc913a4
--- /dev/null
+++ b/gas/testsuite/gas/arc/relax-avoid3.s
@@ -0,0 +1,5 @@
+test:
+	add	r0,r0,r0
+	.weak	test
+main:
+	b	test
diff --git a/gas/testsuite/gas/arc/relax-b.d b/gas/testsuite/gas/arc/relax-b.d
new file mode 100644
index 0000000..fd8dc47
--- /dev/null
+++ b/gas/testsuite/gas/arc/relax-b.d
@@ -0,0 +1,19 @@
+#as: -mcpu=archs -mrelax
+#objdump: -dr
+
+.*: +file format .*arc.*
+
+
+Disassembly of section .text:
+
+00000000 <foo-0x4>:
+   0:	78e0                	nop_s
+   2:	78e0                	nop_s
+
+00000004 <foo>:
+   4:	2000 0000           	add	r0,r0,r0
+
+00000008 <bar>:
+   8:	ffff                	bl_s	4 <foo>
+   a:	2100 0041           	add	r1,r1,r1
+   e:	f1fc                	b_s	4 <foo>
diff --git a/gas/testsuite/gas/arc/relax-b.s b/gas/testsuite/gas/arc/relax-b.s
new file mode 100644
index 0000000..3698b14
--- /dev/null
+++ b/gas/testsuite/gas/arc/relax-b.s
@@ -0,0 +1,11 @@
+	.text
+	nop_s
+	.align 4
+foo:
+	add	r0,r0,r0
+
+	.align 4
+bar:
+	bl	@foo
+	add	r1,r1,r1
+	b	@foo