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Maciej W. Rozycki 7bd374a44d MIPS/GAS: Implement microMIPS branch/jump compaction
Convert microMIPS branches and jumps whose delay slot would be filled by
a generated NOP instruction to the corresponding compact form where one
exists, in a manner similar to MIPS16 JR->JRC and JALR->JALRC swap.

Do so even where the transformation switches from a 16-bit to a 32-bit
branch encoding for no benefit in code size reduction, as this is still
advantageous.  This is because a branch/NOP pair takes 2 pipeline slots
or a 2-cycle completion latency except in superscalar implementations.
Whereas a compact branch may or may not stall on its target fetch, so it
will at most have a 2-cycle completion latency and may have only 1 even
in scalar implementations, and in superscalar implementations it is
expected to have no worse latency as a branch/NOP pair has.  Also it
won't stall and therefore take the extra latency cycle in the not-taken
case.

Technically this is the same as MIPS16 compaction: for the qualifying
instruction encodings the APPEND_ADD_COMPACT machine code generation
method is selected where APPEND_ADD_WITH_NOP otherwise would and tells
the code generator in `append_insn' to convert the regular form of an
instruction to its corresponding compact form.  For this the opcode is
tweaked as necessary and the microMIPS opcode table is scanned for the
matching updated instruction.  A non-$0 `rt' operand to BEQ and BNE
instructions is moved to the `rs' operand field of BEQZC and BNEZC
encodings as required.

Unlike with MIPS16 compaction however we need to handle out-of-distance
branch relaxation as well.  We do this by deferring the generation of
any delay-slot NOP required to relaxation made in `md_convert_frag', by
converting the APPEND_ADD_WITH_NOP machine code generation to APPEND_ADD
where a relaxed instruction is recorded.  Relaxation then, depending on
actual code produced, chooses between either using a compact branch or
jump encoding and emitting the NOP outstanding if no compact encoding is
possible.

For code simplicity's sake the relaxation pass is retained even if the
principle of preferring a compact encoding to a 16-bit branch/NOP pair
means, in the absence of out-of-range branch relaxation, that a single
compact branch machine code instruction will eventually be produced from
a given assembly source instruction.

	gas/
	* config/tc-mips.c (RELAX_MICROMIPS_ENCODE): Add `nods' flag.
	(RELAX_MICROMIPS_RELAX32, RELAX_MICROMIPS_TOOFAR16)
	(RELAX_MICROMIPS_MARK_TOOFAR16, RELAX_MICROMIPS_CLEAR_TOOFAR16)
	(RELAX_MICROMIPS_TOOFAR32, RELAX_MICROMIPS_MARK_TOOFAR32)
	(RELAX_MICROMIPS_CLEAR_TOOFAR32): Shift bits.
	(get_append_method): Also return APPEND_ADD_COMPACT for
	microMIPS instructions.
	(find_altered_mips16_opcode): Exclude macros from matching.
	Factor code out...
	(find_altered_opcode): ... to this new function.
	(find_altered_micromips_opcode): New function.
	(frag_branch_delay_slot_size): Likewise.
	(append_insn): Handle microMIPS branch/jump compaction.
	(macro_start): Likewise.
	(relaxed_micromips_32bit_branch_length): Likewise.
	(md_convert_frag): Likewise.
	* testsuite/gas/mips/micromips.s: Add conditional explicit NOPs
	for delay slot filling.
	* testsuite/gas/mips/micromips-b16.s: Add explicit NOPs for
	delay slot filling.
	* testsuite/gas/mips/micromips-size-1.s: Likewise.
	* testsuite/gas/mips/micromips.l: Adjust line numbers.
	* testsuite/gas/mips/micromips-warn.l: Likewise.
	* testsuite/gas/mips/micromips-size-1.l: Likewise.
	* testsuite/gas/mips/micromips.d: Adjust padding.
	* testsuite/gas/mips/micromips-trap.d: Likewise.
	* testsuite/gas/mips/micromips-insn32.d: Likewise.
	* testsuite/gas/mips/micromips-noinsn32.d: Likewise.
	* testsuite/gas/mips/micromips@beq.d: Update patterns for
	branch/jump compaction.
	* testsuite/gas/mips/micromips@bge.d: Likewise.
	* testsuite/gas/mips/micromips@bgeu.d: Likewise.
	* testsuite/gas/mips/micromips@blt.d: Likewise.
	* testsuite/gas/mips/micromips@bltu.d: Likewise.
	* testsuite/gas/mips/micromips@branch-misc-4.d: Likewise.
	* testsuite/gas/mips/micromips@branch-misc-4-64.d: Likewise.
	* testsuite/gas/mips/micromips@branch-misc-5.d: Likewise.
	* testsuite/gas/mips/micromips@branch-misc-5pic.d: Likewise.
	* testsuite/gas/mips/micromips@branch-misc-5-64.d: Likewise.
	* testsuite/gas/mips/micromips@branch-misc-5pic-64.d: Likewise.
	* testsuite/gas/mips/micromips@jal-svr4pic-local.d: Likewise.
	* testsuite/gas/mips/micromips@jal-svr4pic-local-n32.d:
	Likewise.
	* testsuite/gas/mips/micromips@jal-svr4pic-local-n64.d:
	Likewise.
	* testsuite/gas/mips/micromips@loc-swap.d: Likewise.
	* testsuite/gas/mips/micromips@loc-swap-dis.d: Likewise.
	* testsuite/gas/mips/micromips@relax.d: Likewise.
	* testsuite/gas/mips/micromips@relax-at.d: Likewise.
	* testsuite/gas/mips/micromips@relax-swap3.d: Likewise.
	* testsuite/gas/mips/branch-extern-2.d: Likewise.
	* testsuite/gas/mips/branch-extern-4.d: Likewise.
	* testsuite/gas/mips/branch-section-2.d: Likewise.
	* testsuite/gas/mips/branch-section-4.d: Likewise.
	* testsuite/gas/mips/branch-weak-2.d: Likewise.
	* testsuite/gas/mips/branch-weak-5.d: Likewise.
	* testsuite/gas/mips/micromips-branch-absolute.d: Likewise.
	* testsuite/gas/mips/micromips-branch-absolute-n32.d: Likewise.
	* testsuite/gas/mips/micromips-branch-absolute-n64.d: Likewise.
	* testsuite/gas/mips/micromips-branch-absolute-addend.d:
	Likewise.
	* testsuite/gas/mips/micromips-branch-absolute-addend-n32.d:
	Likewise.
	* testsuite/gas/mips/micromips-branch-absolute-addend-n64.d:
	Likewise.
	* testsuite/gas/mips/micromips-compact.d: New test.
	* testsuite/gas/mips/mips.exp: Run the new test.

	ld/
	* testsuite/ld-mips-elf/micromips-branch-absolute.d: Update
	patterns for branch compaction.
	* testsuite/ld-mips-elf/micromips-branch-absolute-addend.d:
	Likewise.

	opcodes/
	* micromips-opc.c (micromips_opcodes): Reorder "bc" next to "b",
	"beqzc" next to "beq", "bnezc" next to "bne" and "jrc" next to
	"j".
2016-07-27 17:38:31 +01:00
bfd Fix seg-fault when running garbage collection on coff binaries. 2016-07-27 10:50:52 +01:00
binutils Set BFD_VERSION to 2.27.51 2016-07-21 15:22:13 -07:00
config
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gas MIPS/GAS: Implement microMIPS branch/jump compaction 2016-07-27 17:38:31 +01:00
gdb Wean gdb and sim off private libbfd.h header 2016-07-27 09:01:45 +09:30
gold Fix aarch64_relocs.sh file mode 2016-07-27 16:26:42 +09:30
gprof Set BFD_VERSION to 2.27.51 2016-07-21 15:22:13 -07:00
include Begin implementing ARC NPS-400 Accelerator instructions 2016-07-27 15:57:18 +01:00
intl
ld MIPS/GAS: Implement microMIPS branch/jump compaction 2016-07-27 17:38:31 +01:00
libdecnumber
libiberty
opcodes MIPS/GAS: Implement microMIPS branch/jump compaction 2016-07-27 17:38:31 +01:00
readline
sim Wean gdb and sim off private libbfd.h header 2016-07-27 09:01:45 +09:30
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ChangeLog Enable the configuration of GDB for the NDS32 target. 2016-07-20 09:06:39 +01:00
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configure Enable the configuration of GDB for the NDS32 target. 2016-07-20 09:06:39 +01:00
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